Frequently asked Questions & Answers

Yes, we offer various storage solutions, including battery storage for photovoltaic systems, to make optimal use of self-generated electricity and increase grid independence.

Modern heat pumps are very efficient even at low outdoor temperatures. They can extract heat from the environment even in frosty conditions and are therefore a reliable energy source throughout winter.

Thanks to our expertise and modern technology, we can seamlessly integrate renewable energy systems into existing infrastructure – whether in new buildings or when modernising older properties.

Like all technical installations, renewable energy systems also require regular maintenance. The exact requirements vary depending on the technology, but we offer comprehensive maintenance contracts to ensure a long service life and optimal performance.

The systems are designed to significantly reduce CO₂ emissions. The exact savings depend on the system in question, but we prioritise maximum efficiency and sustainability.

There is a wide range of subsidy programmes at both state and federal level. We are happy to advise you in detail on the current options and provide support with applications.

Profitability depends on various factors, including the size of the project and the chosen technology. In general, such systems often pay for themselves within a few years, not least thanks to government subsidies and saved energy costs.

We offer a wide range of solutions, including heat pumps, photovoltaic systems, fuel cell heating & CHP systems, to name just a few.

Solar thermal systems use sunlight to generate heat, which is primarily used for hot water and space heating. Photovoltaic systems, on the other hand, convert sunlight directly into electricity. Both systems can be combined to maximise energy efficiency.

Heat pumps are significantly more efficient than conventional heating systems. They can generate three to five times more energy than they consume. This makes them a cost-effective and environmentally friendly alternative.

The lifespan varies by system type. Photovoltaic systems typically last 25 to 30 years, solar thermal systems around 20 to 25 years, and heat pumps around 15 to 20 years. Regular maintenance can extend the service life.

On days with little sun or wind, energy storage systems such as batteries can bridge the gap. Alternatively, you can draw on the public electricity grid. A well-designed system takes such scenarios into account to ensure reliable energy supply.

Renewable energy systems can increase the value of your property, as they reduce energy costs and make the property more attractive to potential buyers. An energy-efficient home is increasingly in demand in today's market.

Yes, renewable energies can also be installed in older buildings, although additional adjustments may sometimes be necessary. A thorough on-site assessment helps to identify the best solutions for your specific building.

There are various government subsidies available for the installation of renewable energy systems, including grants and low-interest loans from the KfW development bank and the BAFA (Federal Office for Economic Affairs and Export Control). We can provide advice on the available options and help you apply.

Complete independence from the electricity grid is theoretically possible with a sufficient combination of renewable energy sources and storage systems. However, this requires careful planning and a significant investment. For most households, a hybrid solution – combining self-generated energy with grid connection – is the most practical option.

The payback period for a photovoltaic system depends on various factors, including system size, location, energy consumption, and available subsidies. On average, payback takes between eight and twelve years.

Depending on your home's location and structural conditions, a variety of systems may be suitable, including photovoltaic systems, solar thermal systems, heat pumps, or even small wind turbines. We offer a comprehensive consultation to find the best solution for your needs.

Renewable energies offer numerous benefits: they reduce your energy costs, make you less dependent on fossil fuels and rising energy prices, and contribute to environmental protection. In addition, they can increase the value of your property and may entitle you to government subsidies.

"Renewable energies" refers to energy sources that are naturally replenished, such as solar energy, wind energy, hydropower, geothermal energy, and biomass. In contrast to fossil fuels, they produce little to no greenhouse gas emissions and contribute to reducing climate change.

We understand that every project has its own characteristics, and we offer tailor-made solutions adapted to your specific needs.

Yes, we offer consultation and solutions for water treatment and conservation, tailored to the specific needs of your property.

We work with a wide range of brands and manufacturers to find the optimal solution for every requirement.

Our specialists are highly qualified and certified, and we guarantee quality through regular training and inspections.

We are committed to full transparency in our pricing and provide detailed, easy-to-understand cost estimates.

We offer thorough analysis and consultation for the modernisation or replacement of old heating systems to increase efficiency and sustainability.

Yes, we offer consultation, installation and maintenance of renewable energy systems such as solar thermal and heat pumps.

Of course. We offer tailor-made maintenance contracts adapted to the needs and requirements of your properties.

Yes, we offer a 24/7 emergency service for urgent repairs and breakdowns. This service is exclusively available to our maintenance customers.

We specialise in heating, plumbing and HVAC technology, including maintenance, repairs and new system installations.

We specialise in the planning and implementation of barrier-free sanitary facilities to ensure accessibility and usability for all persons.

We are experienced in dealing with the special regulations and guidelines for public buildings and actively support you in complying with them.

We work closely with our clients to develop solutions within the given budget framework without compromising on quality.

Yes, we offer comprehensive maintenance and service contracts to ensure the long-term functionality and efficiency of the installed systems.

We plan and carry out our work in a way that minimises disruption to the facility's operation – for example by working outside regular care hours.

We are happy to provide you with our references from previous projects in the public sector.

Yes, we place great emphasis on sustainable, energy-efficient technologies and materials that minimise the ecological footprint of facilities.

We take into account the special needs of children and young people and rely on safe, durable and easy-to-use solutions.

Of course. We strictly adhere to the relevant safety and quality regulations for public facilities.

Yes, we have extensive experience in the on-schedule execution of renovation projects in schools and other public facilities.

Our quality management is based on strict internal guidelines and control procedures to guarantee the highest quality and customer satisfaction. This is also reflected in the "Profi im Handwerk" certification, which covers many elements of DIN ISO 9001.

We are happy to show you a selection of our reference projects that demonstrate our expertise and experience in similar endeavours.

Yes, we have extensive experience in the planning and installation of renewable energy systems at various scales and levels of complexity.

We are experienced in realising sophisticated, modern sanitary facilities for a wide variety of residential and commercial buildings.

We rely on careful planning and close coordination with all parties involved to deliver projects within the given time and budget framework.

Our teams are trained to respond flexibly and efficiently to changes in the course of a project to ensure smooth implementation.

Of course, we support you in complying with all relevant regulations such as the GEG (Buildings Energy Act) and advise you on the best implementation options.

We place great emphasis on the use of sustainable and energy-efficient technologies, including PV systems, heat pumps and modern heating technology.

Yes, we specialise in individual solutions and adapt our HVAC systems to the specific requirements and conditions of each project.

Our HGZ service team is always ready to respond quickly and efficiently to emergencies. In most cases we are on site within a few hours.

Yes, we offer a 24/7 emergency service exclusively for our maintenance customers. For urgent matters, please contact our HGZ service team directly – they're always there for you!

The HGZ service team only uses high-quality, approved spare parts to ensure optimal function and safety.

Should the HGZ service team discover a defect, they will notify you immediately and provide recommendations for next steps.

A maintenance check covers the inspection of all functions, cleaning, possible replacement of wear parts and a safety check. The HGZ service team carries out everything professionally and thoroughly.

The duration depends on the system and the scope of maintenance, but it generally takes a few hours. The HGZ service team will always aim to work as efficiently as possible.

Our HGZ service team is available for all maintenance and service questions. You can contact them at any time.

Costs vary depending on the scope and type of system. Our HGZ service team will provide you with a personalised quote.

Of course! A maintenance contract ensures regular check-ups and priority treatment. The HGZ service team will be happy to inform you about the details.

For optimal performance and longevity, we recommend having systems serviced at least once a year. Your HGZ service team will take care of all the details.

Regular maintenance extends the lifespan of your systems, improves energy efficiency and reduces the risk of breakdowns. The HGZ service team ensures everything runs perfectly.

Yes, we offer various storage solutions, including battery storage for photovoltaic systems, to make optimal use of self-generated electricity and increase grid independence.

Modern heat pumps are very efficient even at low outdoor temperatures. They can extract heat from the environment even in frosty conditions and are therefore a reliable energy source throughout winter.

Thanks to our expertise and modern technology, we can seamlessly integrate renewable energy systems into existing infrastructure – whether in new buildings or when modernising older properties.

Like all technical installations, renewable energy systems also require regular maintenance. The exact requirements vary depending on the technology, but we offer comprehensive maintenance contracts to ensure a long service life and optimal performance.

The systems are designed to significantly reduce CO₂ emissions. The exact savings depend on the system in question, but we prioritise maximum efficiency and sustainability.

There is a wide range of subsidy programmes at both state and federal level. We are happy to advise you in detail on the current options and provide support with applications.

Profitability depends on various factors, including the size of the project and the chosen technology. In general, such systems often pay for themselves within a few years, not least thanks to government subsidies and saved energy costs.

We offer a wide range of solutions, including heat pumps, photovoltaic systems, fuel cell heating & CHP systems, to name just a few.

Our team consists of experienced specialists with comprehensive training and certification in pipeline construction.

Safety is our top priority. We strictly adhere to all safety regulations and standards and ensure our teams are always trained and properly equipped.

Sustainability matters to us. Old materials are recycled wherever possible, and we ensure environmentally responsible disposal of waste.

With regular maintenance and depending on the material, pipeline systems can last several decades.

Yes, we offer regular maintenance and inspection services to ensure the longevity and efficiency of the system.

Pressure systems use pumps to push liquids or gases through the pipes, while gravity systems use the natural fall of the liquid. The choice depends on the specific requirements of the project.

After completing installation work, we carry out extensive pressure and leak tests to ensure everything is functioning properly.

Yes, we have extensive experience retrofitting pipelines in existing buildings, whether for modernisations or expansions.

We use a wide range of materials depending on the application, including copper, stainless steel, galvanised steel and modern plastics. Each material has its own advantages depending on project requirements.

Of course! We can provide you with a list of our previous projects and references so you can get a picture of our work.

Safety is our highest priority. We strictly adhere to all applicable regulations and standards to ensure that everything is installed safely and correctly.

We place great importance on clear communication. In the event of unexpected challenges, we inform our customers immediately and work closely with them to find the best solutions.

Yes, we offer comprehensive maintenance contracts to ensure that systems always function optimally and their lifespan is maximised.

Sustainability and energy efficiency are very important to us. We always advise our customers on the most energy-efficient solutions and rely on modern technologies that save both money and the environment.

We work with a wide range of leading manufacturers to ensure our customers receive the best quality and performance.

Yes, we have already carried out a wide variety of projects for both smaller commercial units and large commercial and public buildings.

We specialise in the construction of heating, ventilation, air conditioning and sanitary systems. From modern heating systems to efficient ventilation installations, we cover the full spectrum.

Yes, we have a wide range of successfully completed projects. We'd be happy to show you some of our references.

Our focus is on individual solutions, appreciative treatment and needs-orientation. We also value clear communication and a positive mindset.

We specialise in the new build & modernisation of HVAC systems in public & commercial buildings, as well as consultation through to commissioning of HVAC systems for single- and multi-family homes.

We understand that every project has its own characteristics, and we offer tailor-made solutions adapted to your specific needs.

Yes, we offer consultation and solutions for water treatment and conservation, tailored to the specific needs of your property.

We work with a wide range of brands and manufacturers to find the optimal solution for every requirement.

Our specialists are highly qualified and certified, and we guarantee quality through regular training and inspections.

We are committed to full transparency in our pricing and provide detailed, easy-to-understand cost estimates.

We offer thorough analysis and consultation for the modernisation or replacement of old heating systems to increase efficiency and sustainability.

Yes, we offer consultation, installation and maintenance of renewable energy systems such as solar thermal and heat pumps.

Of course. We offer tailor-made maintenance contracts adapted to the needs and requirements of your properties.

Yes, we offer a 24/7 emergency service for urgent repairs and breakdowns. This service is exclusively available to our maintenance customers.

We specialise in heating, plumbing and HVAC technology, including maintenance, repairs and new system installations.

You can request the water hardness value from your local water supplier or use a test kit to measure it yourself. We are also happy to assist you with this.

If your system reports a fault, please note the error message and contact us. Our technicians can usually diagnose and resolve the problem quickly.

Yes, soft water can extend the lifespan of household appliances by reducing limescale buildup. It also means you need less detergent and cleaning products.

The frequency depends on the type of filter and the quality of your water. As a general rule, filters should be changed every six to twelve months. We recommend following the manufacturer's instructions.

The Grohe Sense Guard is a smart water controller that monitors your water consumption, detects leaks, and can automatically shut off the water supply to prevent damage. It can be conveniently controlled via a smartphone app.

The Grohe Blue tap provides chilled, filtered, still or sparkling water directly from the tap. It is an environmentally friendly and convenient alternative to bottled water, as it reduces plastic waste and saves money in the long run.

Both systems reduce water hardness, but they work differently. A water softener uses an ion exchange process to remove calcium and magnesium ions, while a soft water system may use other technologies. The choice depends on your specific requirements and water quality.

You can call us at any time. We offer an emergency service and will be on site quickly to resolve the problem.

Spring or summer is ideal for maintenance, before the heating season begins. This way you're perfectly prepared for the colder months.

A sign of an inefficient heating system is rising energy costs. Regular maintenance and inspection by our team can help identify problems early.

A standard maintenance service usually takes 1–2 hours, depending on the system and its condition.

Regular maintenance extends the lifespan of your systems, reduces energy consumption and prevents costly repairs through early problem identification.

No. While a maintenance service is about maintaining the current condition of the system, the heating check goes further and generates comprehensive recommendations for improving heating operation and its efficiency.

Costs differ depending on the type of system to be serviced and any additional equipment included. You can easily calculate the cost of a maintenance service for your specific system using our maintenance calculator.

Maintenance and repair are two distinct services. Maintenance aims to preserve the current operating condition of the heating system. It is carried out on functional equipment, without in-depth fault diagnosis or repairs. Maintenance is a long-term preventive measure. A repair, on the other hand, is carried out when a fault or defect has already occurred.

Maintenance includes checking the controls and safety devices, cleaning the boiler and burner, measuring and checking flue gas values, and replacing wear parts.

Regular heating maintenance makes sense for many reasons. Among other things, proper maintenance can help avoid costly repairs. A heating system also consumes less energy when it is professionally serviced, which permanently reduces costs.

The heating system should be serviced once a year – ideally in summer or at the very beginning of the heating season.

We offer a wide range of heating systems, including gas heating, but above all renewable energy systems such as heat pumps and PV systems.

No, the quote from the heating calculator is non-binding. After an on-site assessment we can provide you with a binding offer.

Absolutely! Once you have received your quote, you are welcome to arrange an appointment with us to discuss the next steps.

You should have information about your current heating system, the year of construction of your building and the floor area to hand.

A modern heating system is more energy-efficient, leading to lower heating costs, and it contributes to environmental protection through reduced CO₂ emissions.

The quote is generated immediately after you enter your details and displayed to you straight away.

Of course! Just enter the information you have. For a precise quote we can then clarify the details together.

Yes, our online heating calculator is completely free of charge and non-binding.

The quote is an initial non-binding estimate based on the data you have entered. A detailed quote would require an on-site assessment.

Our heating calculator allows you to receive a non-binding quote for a heating modernisation by entering details about your current heating system and built. Simply fill in the relevant information and start the calculator.

If your heating breaks down, please contact our emergency service immediately. In the meantime, check whether the thermostat is set correctly and whether the pressure in the system is within the normal range. If you smell gas, leave the building immediately and call the gas emergency number.

The installation time depends on the type of heating system and the complexity of the installation. In general, installing a new heating system takes between one and three days. We will give you an accurate estimate during the planning phase.

Hydraulic balancing is the process of adjusting the flow rates in a heating system so that all radiators and floor heating circuits are supplied with the right amount of heat. This improves energy efficiency, increases comfort, and can reduce heating costs by up to 15 percent.

Underfloor heating offers several advantages: it distributes heat evenly across the floor, which is particularly comfortable. It operates at lower flow temperatures than conventional radiators, making it especially efficient in combination with heat pumps or condensing boilers. In addition, it frees up wall space as there are no radiators.

Regular servicing, hydraulic balancing, and the use of programmable thermostats can significantly reduce energy consumption. Insulating pipes and, where possible, upgrading to a more efficient heating system are also worthwhile measures. We are happy to advise you on the best options for your home.

We offer a wide range of heating systems, including gas and oil condensing boilers, heat pumps (air source, ground source, and water source), pellet heating systems, and solar thermal systems. We will advise you on which system best suits your needs and building.

We recommend having your heating system serviced at least once a year. Regular maintenance ensures efficient operation, extends the service life of the system, and helps to identify potential issues early.

Yes, regular servicing of your heating system is strongly recommended. It ensures safe and efficient operation, extends the service life of the system, and can prevent costly repairs. In addition, regular maintenance is a requirement for many manufacturer warranties.

Yes, heat pumps can also be used in older buildings. However, it may be necessary to improve the building's insulation to enable efficient operation. Air-to-air heat pumps in particular are relatively easy to retrofit. We will assess the specific conditions of your property and recommend the most suitable solution.

Switching to renewable energies is worthwhile in many respects: it reduces your dependence on fossil fuels, lowers your energy costs in the long term, and contributes to reducing CO₂ emissions. Furthermore, there are attractive government subsidies available to help reduce the initial investment.

The cost of a new heating system varies greatly depending on the type of system, the size of the building, and the complexity of the installation. We are happy to provide you with a non-binding quote tailored to your specific situation.

If your gas or oil heating system is irreparably damaged, we will advise you on suitable replacement options. In view of current energy legislation and sustainability goals, switching to a more efficient system such as a heat pump or a hybrid system is often a sensible choice. We will support you throughout the entire process, from selecting the right system to installation and commissioning.

The result of the Heating Check 2.0 is a written report summarising the findings and any recommended measures. This report can also be submitted to the authorities as proof that the check has been carried out.

Yes, the Heating Check 2.0 is carried out by qualified and certified heating engineers who assess your system objectively and independently. The aim is to provide you with an honest evaluation and practical recommendations.

If deficiencies are found during the Heating Check 2.0, you will receive specific recommendations for improvement. Depending on the severity of the deficiencies, certain measures may need to be implemented within a defined timeframe. We are happy to support you in implementing the necessary improvements.

No special knowledge is required on your part. It is helpful, however, to have the documents for your heating system to hand, such as the operating manual and any previous service records. Our technician will take care of everything else.

Yes, as part of the Heating Check 2.0, our experts can also make recommendations for modernising your heating system if there are opportunities to improve efficiency. This gives you a clear overview of potential savings and possible upgrades.

The duration of the check depends on the size and complexity of your heating system, but it generally takes between one and two hours. The cost varies depending on the scope of work. We are happy to provide you with a non-binding quote in advance.

While a regular heating service focuses primarily on maintaining the system's functionality, the Heating Check 2.0 under EnSimiMaV is a more comprehensive inspection that assesses the efficiency and optimal adjustment of the entire heating system. It also checks whether the system complies with current legal requirements.

The obligation to carry out the Heating Check 2.0 under EnSimiMaV applies to operators of gas heating systems in residential and non-residential buildings. There are specific deadlines and requirements set out in the regulation. We recommend checking whether the obligation applies to you and, if so, arranging the check promptly.

The Heating Check 2.0 helps to identify the efficiency of your heating system and uncover potential savings. It can help reduce your energy costs, extend the service life of your system, and ensure compliance with legal requirements. Moreover, an efficient heating system contributes to reducing CO₂ emissions.

The Heating Check 2.0 is a comprehensive inspection of gas heating systems introduced by the Energy Saving Measures Ordinance (EnSimiMaV). It assesses the efficiency and optimal adjustment of your heating system in order to identify energy-saving potential and make recommendations for improvement.

According to current legislation in Germany, the installation of new heating systems that run exclusively on fossil fuels such as gas or oil is subject to increasingly strict regulations. From 2024, new heating systems must generally be capable of operating with at least 65% renewable energy. We will advise you on the current legal situation and suitable alternatives.

HGZ stands for far more than just craftsmanship! We see ourselves as true shapers of the future in building technology and as dedicated enablers for our customers. But it's not only our out-of-the-box thinking that makes us special.

The unique combination of long-standing experience, innovative problem-solving skills and maximum service focus is what truly inspires our customers.

No wonder we've already received numerous awards – including recognition as one of the best employer brands in the skilled trades.

Success always requires a strong "we". And many of our projects demand close collaboration between different departments and specialist areas. That's why a strong team culture has always been a matter of course for us – we foster open communication and respectful exchange to find the best solutions for our customers together.

We always have an open ear for the individual wishes of our employees. This includes enabling flexible working models wherever the role allows. Interested in home-office options, flexible hours or part-time arrangements? We're happy to talk it through and find out together what's possible!

Our working hours are generally Monday to Thursday 07:00–16:00 and Friday 07:00–15:00. Thanks to our good planning and structure, overtime or weekend work is extremely rare. When it does occur, we always strive to compensate accordingly.

Our onboarding is clearly structured so you settle in smoothly and quickly feel part of the HGZ team. New employees are always paired with an experienced colleague who acts as a mentor. In the first weeks you'll get to know all the key processes, our products and our customers – step by step.

Anyone who wants to grow at HGZ gets our active support. Through internal training and the opportunity to take on real project responsibility, you can develop professionally at any time. We also offer attractive prospects for leadership positions and specialist roles.

We place great importance on the continuous development of our employees. That's why we offer regular training and workshops – covering both technical skills and soft skills. We also actively support participation in external further education and professional certifications.

Our application process is intentionally streamlined to make it as easy as possible for you. You can apply without a cover letter or CV directly via WhatsApp, e-mail or our application form. We review every application carefully and get back to you quickly.

For most positions you should have a completed apprenticeship in plumbing, heating or HVAC technology. Depending on the role, additional qualifications such as a master craftsman's certificate or specialist certifications can be an advantage. Of course we are also happy to hear from motivated career changers!

We specialise in the planning and implementation of barrier-free sanitary facilities to ensure accessibility and usability for all persons.

We are experienced in dealing with the special regulations and guidelines for public buildings and actively support you in complying with them.

We work closely with our clients to develop solutions within the given budget framework without compromising on quality.

Yes, we offer comprehensive maintenance and service contracts to ensure the long-term functionality and efficiency of the installed systems.

We plan and carry out our work in a way that minimises disruption to the facility's operation – for example by working outside regular care hours.

We are happy to provide you with our references from previous projects in the public sector.

Yes, we place great emphasis on sustainable, energy-efficient technologies and materials that minimise the ecological footprint of facilities.

We take into account the special needs of children and young people and rely on safe, durable and easy-to-use solutions.

Of course. We strictly adhere to the relevant safety and quality regulations for public facilities.

Yes, we have extensive experience in the on-schedule execution of renovation projects in schools and other public facilities.

Our quality management is based on strict internal guidelines and control procedures to guarantee the highest quality and customer satisfaction. This is also reflected in the "Profi im Handwerk" certification, which covers many elements of DIN ISO 9001.

We are happy to show you a selection of our reference projects that demonstrate our expertise and experience in similar endeavours.

Yes, we have extensive experience in the planning and installation of renewable energy systems at various scales and levels of complexity.

We are experienced in realising sophisticated, modern sanitary facilities for a wide variety of residential and commercial buildings.

We rely on careful planning and close coordination with all parties involved to deliver projects within the given time and budget framework.

Our teams are trained to respond flexibly and efficiently to changes in the course of a project to ensure smooth implementation.

Of course, we support you in complying with all relevant regulations such as the GEG (Buildings Energy Act) and advise you on the best implementation options.

We place great emphasis on the use of sustainable and energy-efficient technologies, including PV systems, heat pumps and modern heating technology.

Yes, we specialise in individual solutions and adapt our HVAC systems to the specific requirements and conditions of each project.

Our team consists of experienced specialists with comprehensive training and certification in pipeline construction.

Safety is our top priority. We strictly adhere to all safety regulations and standards and ensure our teams are always trained and properly equipped.

Sustainability matters to us. Old materials are recycled wherever possible, and we ensure environmentally responsible disposal of waste.

With regular maintenance and depending on the material, pipeline systems can last several decades.

Yes, we offer regular maintenance and inspection services to ensure the longevity and efficiency of the system.

Pressure systems use pumps to push liquids or gases through the pipes, while gravity systems use the natural fall of the liquid. The choice depends on the specific requirements of the project.

After completing installation work, we carry out extensive pressure and leak tests to ensure everything is functioning properly.

Yes, we have extensive experience retrofitting pipelines in existing buildings, whether for modernisations or expansions.

We use a wide range of materials depending on the application, including copper, stainless steel, galvanised steel and modern plastics. Each material has its own advantages depending on project requirements.

Current trends in bathroom design include the use of natural materials such as stone and wood, minimalist design with clean lines, smart bathroom technology, walk-in showers, freestanding bathtubs, and sustainable products that conserve water and energy.

There are several ways to save water and energy in the bathroom: installing water-saving fittings and shower heads, using thermostatic shower systems to avoid wasting water while waiting for the right temperature, and choosing energy-efficient lighting. Insulating your hot water pipes can also help reduce heat loss.

Whether you can remain in your home during the renovation depends on the scope of the work. For minor renovations, it is often possible to stay. For more extensive work, temporary relocation may be advisable. We will discuss this with you in advance and plan accordingly.

High-quality ceramic tiles, natural stone, and modern composite materials are popular choices for durable and stylish bathrooms. For fittings, stainless steel or chrome-plated brass are recommended. The right choice of materials depends on your personal preferences and budget.

If you live in a homeowners' association (WEG), you generally only need approval for changes that affect the structure of the building or shared areas. For work within your own apartment, you usually have more freedom, but it is advisable to inform your neighbours and the property management in advance to avoid any disputes.

Yes, there are various subsidies available for energy-efficient bathroom renovations, particularly if the work improves energy efficiency or promotes barrier-free accessibility. KfW and BAFA offer relevant programmes. We can advise you on the available options.

A bathroom renovation typically begins with a consultation and planning phase to clarify your wishes and requirements. This is followed by the preparation of a cost estimate and timeline. During the renovation itself, old fittings are removed, any necessary structural work is carried out, and new elements are installed. We coordinate all the tradespeople involved and keep you informed throughout the process.

Our prices for service calls can be found on the Pricing page. You can easily calculate the cost of a heating service using our heating maintenance calculator. For project-based work, costs depend on the scope and requirements. We're happy to provide a personalised quote.

We place great value on ecological sustainability and offer innovative solutions in the field of renewable energies.

Yes, we offer comprehensive maintenance and repair services. Find out more about our services for private customers and regional property management companies.

We have been operating in Berlin since 1996 and bring many years of experience in the HVAC trades.

Our HGZ service team is always ready to respond quickly and efficiently to emergencies. In most cases we are on site within a few hours.

Yes, we offer a 24/7 emergency service exclusively for our maintenance customers. For urgent matters, please contact our HGZ service team directly – they're always there for you!

The HGZ service team only uses high-quality, approved spare parts to ensure optimal function and safety.

Should the HGZ service team discover a defect, they will notify you immediately and provide recommendations for next steps.

A maintenance check covers the inspection of all functions, cleaning, possible replacement of wear parts and a safety check. The HGZ service team carries out everything professionally and thoroughly.

The duration depends on the system and the scope of maintenance, but it generally takes a few hours. The HGZ service team will always aim to work as efficiently as possible.

Our HGZ service team is available for all maintenance and service questions. You can contact them at any time.

Costs vary depending on the scope and type of system. Our HGZ service team will provide you with a personalised quote.

Of course! A maintenance contract ensures regular check-ups and priority treatment. The HGZ service team will be happy to inform you about the details.

For optimal performance and longevity, we recommend having systems serviced at least once a year. Your HGZ service team will take care of all the details.

Regular maintenance extends the lifespan of your systems, improves energy efficiency and reduces the risk of breakdowns. The HGZ service team ensures everything runs perfectly.

You can call us at any time. We offer an emergency service and will be on site quickly to resolve the problem.

Spring or summer is ideal for maintenance, before the heating season begins. This way you're perfectly prepared for the colder months.

A sign of an inefficient heating system is rising energy costs. Regular maintenance and inspection by our team can help identify problems early.

A standard maintenance service usually takes 1–2 hours, depending on the system and its condition.

Regular maintenance extends the lifespan of your systems, reduces energy consumption and prevents costly repairs through early problem identification.

No. While a maintenance service is about maintaining the current condition of the system, the heating check goes further and generates comprehensive recommendations for improving heating operation and its efficiency.

Costs differ depending on the type of system to be serviced and any additional equipment included. You can easily calculate the cost of a maintenance service for your specific system using our maintenance calculator.

Maintenance and repair are two distinct services. Maintenance aims to preserve the current operating condition of the heating system. It is carried out on functional equipment, without in-depth fault diagnosis or repairs. Maintenance is a long-term preventive measure. A repair, on the other hand, is carried out when a fault or defect has already occurred.

Maintenance includes checking the controls and safety devices, cleaning the boiler and burner, measuring and checking flue gas values, and replacing wear parts.

Regular heating maintenance makes sense for many reasons. Among other things, proper maintenance can help avoid costly repairs. A heating system also consumes less energy when it is professionally serviced, which permanently reduces costs.

The heating system should be serviced once a year – ideally in summer or at the very beginning of the heating season.

There may be a leak in the system or a problem with the main water supply. We would recommend having the system inspected to determine the exact cause.

This could be due to a faulty heating element, thermostat, or other components. An on-site inspection will provide clarity.

A faulty toilet flush can have various causes, from a defective valve to a problem with the water supply. In most cases this can be repaired quickly, but it is advisable to have it checked to avoid potential water damage.

Unpleasant odours from drains are often caused by blockages or deposits. Regular cleaning can help, but if the smell persists, a professional inspection is recommended.

Make sure that pipes in unheated areas are well insulated. In very cold temperatures, you can also let a thin trickle of water run through the pipes to prevent freezing.

Not necessarily. Often just a worn seal or cartridge needs to be replaced. We can diagnose the problem and carry out the necessary repairs.

We endeavour to reach our customers as quickly as possible in an emergency. Response times may vary depending on the location and time of day, but we always aim to be with you within a few hours.

There are several possible causes, including a defective pump, air in the system, or a problem with the control unit. We recommend calling our emergency service so that we can identify and rectify the problem quickly.

Emergency call-out costs vary depending on the time of day, the scope of work, and the materials required. We will inform you transparently about the costs before starting work.

Please contact us immediately on our emergency number. Our team is available around the clock to provide rapid assistance in urgent situations.

The obligation to supply spare parts varies by manufacturer and product. In general, manufacturers are required to supply spare parts for a certain number of years after production ends. Please contact us for specific information about your device.

Repair costs depend on the nature and extent of the damage as well as the materials required. We offer transparent pricing and will provide you with a cost estimate before starting any work.