Installation of water heater

The thermal comfort of your home depends largely on the quality of your water heater. To ensure a successful installation, it's essential to call in a qualified professional. Call on Ajusto to install your water heater to the highest standards.
water heater

What type of water heater should I choose?


Energy source
How it works
Energy consumption
Installation costs
Cost of use
Storage capacity
Service life
Noise level
Space required
Eligible for subsidies


Electricity or gas
Electric resistance
10-15 years


Heat pump
Medium (low with subsidies)
15-20 years
More important

In short, the thermodynamic boiler consumes less energy, lasts longer and requires more space. It is also eligible for financial subsidies, unlike the conventional boiler.

water heater differences

The difference between a conventional water heater and a thermodynamic water heater

A conventional water heater uses an energy source, usually electricity or gas, to heat water stored in a tank. The temperature of the water is maintained at a constant level even when no-one is using the hot water, which results in energy losses.

A thermodynamic water heater, on the other hand, uses the heat energy in the ambient air to heat the water. It works on the same principle as a heat pump. The air is drawn in from outside and circulated through a refrigeration system that extracts the heat from the air. This heat is then transferred to the water stored in the tank. As air is a renewable energy source, the thermodynamic boiler is more environmentally friendly and less expensive in terms of energy than the conventional boiler.

What's more, the thermodynamic water heater (and certain models of conventional water heater with intelligent control) is equipped with a temperature control system that heats the water only when it's needed, reducing energy losses and making significant energy savings. On the other hand, the cost of purchasing and installing a thermodynamic boiler is generally higher than that of a conventional boiler, although thanks to regional subsidies, the return on investment is very rapid.

The advantages of conventional and thermodynamic boilers

The advantages of a conventional water heater

Ease of installation

One of the primary advantages of a conventional water heater is its ease of installation. It can be installed quickly and simply by an experienced professional. Installation does not require any major changes to the plumbing or electrical systems, which reduces the cost and inconvenience of installation.

Affordable cost

Conventional water heaters are generally cheaper to buy than other types of water heater, such as solar or thermodynamic water heaters. This makes the system more accessible to households with a limited budget for installing a water heater.

Ease of maintenance

Conventional water heaters generally last between 10 and 15 years, provided they are properly maintained. They are designed to be easy to maintain, with spare parts commonly available and maintenance costs generally moderate.


Conventional water heaters are considered to be very reliable, as they are designed to operate trouble-free for many years. They are less likely to break down than some more complex systems, such as solar or condensing water heaters.

Compatibility with various energy sources

Conventional water heaters can work with a variety of energy sources, such as gas, electricity or oil. This allows you to choose the most economical option that's best suited to your situation.

The advantages of a thermodynamic water heater

Energy savings

By recovering energy from the air, a thermodynamic boiler can achieve energy savings of up to 70% compared with a conventional electric water heater. In fact, for every 1 kWh of electricity consumed, it gives off between 2 and 4 kWh of heat.


The thermodynamic boiler uses a renewable, non-polluting energy source, making it an environmentally-friendly solution. What's more, it emits very few greenhouse gases, helping to combat global warming. For those with solar panels, a thermodynamic water heater is the ideal solution for using your self-generated electricity by connecting it directly to the solar panels.

Reliability and longevity

Thermodynamic water heaters are designed to be durable and require little maintenance. The average lifespan of a thermodynamic boiler is 15 to 20 years.

Improved EPB

Thanks to its efficient operation, the thermodynamic water heater can considerably reduce the energy consumption needed to produce hot water. This reduction in energy consumption translates into an improvement in the EPB. The presence of a thermodynamic boiler can be seen as an asset for a property on the market. Indeed, more and more buyers are becoming aware of the energy performance of buildings, which can lead to an increase in the value of the property.

Financial savings and subsidies

Installing a thermodynamic boiler means significant financial savings on energy bills. The electricity required to heat the water is significantly reduced, which translates into long-term savings.

What's more, there are a number of financial subsidies available to encourage the installation of thermodynamic boilers. These subsidies can cover up to €1.600 of the cost of installing a thermodynamic water heater, making the investment even more attractive.

Here's an overview of the subsidies available for installing a thermodynamic boiler:

  • Walloon Region: the subsidies allocated by the Walloon Region depends on your income and the location of the property. It ranges from €500 to €3.000 per home, with a ceiling of 70% of the invoice. Interesting fact: until 30 June 2023, you no longer need to have a home audit carried out before applying for the subsidies.

  • Flemish Region: the subsidies allocated by the Flemish Region can be up to €1.080.

  • Brussels-Capital Region: the subsidies allocated by Brussels Environment varies between €1.400 and €1.600 per home, depending on income and location. The maximum (50% of the invoice) has been temporarily suspended to encourage Brussels residents to opt for this renewable energy system as much as possible.

It is important to note that the amounts and conditions of eligibility for subsidies may change over time. We recommend that you regularly consult the official websites mentioned for the latest information and contact the relevant authorities to check your eligibility for the grants.

water heater subsidies

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The expertise of a qualified professional

Calling in a professional to install a conventional or thermodynamic water heater guarantees you recognised expertise and specific skills. A certified installer is trained in the various installation techniques and the standards in force, so you can be sure of quality work.

A safe installation that complies with standards

A qualified professional will ensure that the installation of your water heater complies with current standards and safety regulations. In particular, he will ensure that the electrical and hydraulic connections are made correctly and that the safety devices are in place. By calling in an expert, you minimise the risk of incidents linked to incorrect installation and ensure the safety of your home.

Personalised support

A professional water heater installer will be with you every step of the way, from selecting the right model for your home to putting the appliance into service. They can advise you on the best options in terms of energy, capacity and performance, taking into account your budget and expectations. They will also be able to tell you about the financial and tax subsidies available for your project.

After-sales service and guarantee

When you call in a professional to install your water heater, you'll benefit from after-sales service and a guarantee on the equipment and installation. In the event of a problem, you can count on the installer's assistance and expertise to resolve the problem quickly. This guarantee also gives you peace of mind and prevents you from incurring unforeseen expenses as a result of poor installation.

Maintaining your water heater

A qualified professional not only installs your water heater, but also provides regular maintenance. This service will help you extend the life of your equipment and ensure that it runs smoothly over the long term. Regular maintenance of your boiler is essential to prevent breakdowns and malfunctions, and to optimise the appliance's energy performance.

Take into account your hot water needs

Installing a water heater is a crucial step in ensuring a constant supply of domestic hot water. Whether you choose a gas, thermodynamic or electric water heater, it's essential to consider your hot water needs to determine the volume of water required.

A hot water cylinder, for example, can store several litres of water, ready for use at any time. This type of appliance, also known as a storage water heater, can operate during off-peak hours to optimise your energy consumption and reduce your bill. It is supplied with cold water, which is then heated and stored for use when you need it.

Thermodynamic water heaters, on the other hand, use the calories in the extracted air or outside air to heat the water. These water heaters can provide more hot water than traditional water heaters, while saving you money on your energy bill. Special care needs to be taken when connecting these appliances to minimise heat loss and optimise domestic hot water production.

If you need less water, a conventional water heater may be an appropriate option. It heats domestic water on demand, eliminating the need for a storage tank and reducing energy costs. However, make sure you have a sufficient cold water supply to feed this appliance.

Whether you choose to buy a natural gas water heater, an electric water heater or a thermodynamic water heater, it is advisable to call in a professional to install your water heater. A qualified professional can advise you on the best type of appliance to choose based on your hot water consumption, install the water heater correctly and set the temperature to ensure optimum operation.

Don't forget that you need to use hot water rationally to avoid emptying your hot water tank quickly. Wise use, combined with the right choice of water heater, can help minimise your energy bill and maximise the availability of domestic hot water.

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Testimonials from our users

Installation boiler

The work to install my new water heater is not yet complete, but so far so good. Fair price and very friendly professional.



Installation of thermodynamic boiler

Honestly, I've got nothing to complain about. I was persuaded to install a thermodynamic boiler instead of a conventional boiler and I don't regret my choice. It's slightly more expensive to buy but with the subsidies and above all the energy savings I've made, I'm a big winner!



Installation of thermodynamic boiler

Hello. A quick and efficient thermodynamic water heater installation. Good advice from the heating engineers. Thanks to him and to Ajusto.



Installation boiler

This heating engineer is a real pro! My new boiler was installed to the highest professional standards in record time. I finally have hot water again. Thank you Ajusto.



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