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Frequently asked questions

By 2050, 7 million homes and 1 million buildings will have to stop using natural gas. That means a) insulating and b) using sustainable heat and electricity. A lot needs to be done, but there is still almost 30 years left to get it done.

As a first step, the first 1.5 million existing homes must be made more sustainable by 2030. Cooll’s thermodynamic heat pump will use gas as fuel in the first rollout. However, 30% less gas is needed to heat the house compared to existing condensing boilers. CO2 emissions are also 30% lower. By insulating the house, much higher combined savings in gas consumption and CO2 emissions can be achieved, depending, of course, entirely on the degree of insulation. Insulation is usually the best first step in realizing savings.

This way, we contribute to the goals of the Paris Climate Agreement. The product has been developed in such a way that the heat pump can also function on biogas and hydrogen in the future; only the burner needs to be adjusted for this. In other words, a flexible solution that is prepared for the future.

Policy differences per country ensure that one country has a successful roll-out of the technology, while this will be less the case in other countries. In Germany, natural gas is used as a transition fuel, and large groups are connected to natural gas because the initial situation in Germany is completely different than in the Netherlands. Roughly half of the German households now use natural gas. About 14% of German households are connected to a heat network, 5% have electrical heating. In addition, a quarter of Germany burns fuel oil, and in the residual group, there are still households using propane and even on coal. A large proportion of households that use natural gas or fuel oil use outdated technology with low efficiency. By switching to a natural gas boiler in Germany first, a significant step has already been taken in light of the climate objectives.

In the Netherlands, about 90% of homes are already heated using a natural gas central heating boiler. In the Netherlands, the next step is to stop using natural gas altogether, but electrification makes the transition in the Netherlands slow and expensive, because the grid infrastructure needs a big upgrade. Cooll’s solution is unique in its simplicity: replacing the condensing boiler with a thermodynamic heat pump consumes less gas, saves CO2 emissions, and is ready for the transition to biogas or hydrogen.


In the Netherlands and Europe, there is a heavy focus on hydrogen. Industry, heavy-duty transport, and the built environment can certainly use hydrogen as an energy carrier. The question is when and how much hydrogen will be available for the built environment. With the thermodynamic heat pump, Cooll possesses important conversion technology to efficiently use hydrogen as a fuel for the heat pump.

Because the heat pump is thermally driven instead of mechanically, hardly any noise is produced. There are hardly any moving parts. The sound that can be perceived is comparable to that of a standard condensing boiler.

The heat pump is about the same size as a standard central heating boiler. As a result, it can be easily exchanged. The heat pump can be connected to existing supply and return pipes. The roof outlet for drawing in the outside air just needs to be increased a bit. A relatively simple adjustment that can be carried out from within the home.

Cooll works together with various parties and will supply the technology to producers of heating products. The manufacturers develop the end product for the consumer by adding the burner, the casing, and the type of roof or wall terminal. The goal is to install the first series of products from 2023 onward.

Depending on the final configuration by the producers, the investment will be comparable to the investment in solar panels and can be earned back well within the economic lifespan through the savings on gas consumption

This depends on specific circumstances, such as the amount of the original gas consumption and the type of heating system. With a simple replacement of the condensing boiler with a high-temperature heating system, approximately 30% less gas is required compared to the existing condensing boiler. The emission of CO2 is also 30% lower. With heating systems with lower output temperatures (such as underfloor heating), the savings can be up to 40%. Savings of up to 50% can be achieved by replacing older (VR) heating appliances or combining complementary sustainable techniques in the heating system. By insulating the house, much higher combined savings can be achieved, depending, of course, entirely on the degree of insulation.

As much CO2 is saved as gas, so 30-50%

Hydrogen is the energy carrier of the future. It is expected that green hydrogen will first be blended into the gas grid. After 2030, we expected hydrogen to be rolled out on a larger scale. The role of hydrogen will be limited in the coming years because it cannot yet be produced sustainably.

The great thing about the Cooll heat pump is that it already works on natural gas, so you can already switch to a solution of the future.

Our heat pump will be introduced to the market in series in the coming years on a project basis. This means that the heat pump is not yet available for private homeowners to order. We expect to introduce a product for the private market after 2023. You can continue to follow us via our website and social media channels.

Absolutely, the Cooll heat pump will be available in various product configurations, including tap water, of course.

Our first version of the system will be equipped with a roof terminal. A version with a wall terminal is under development and will be available at a later date.

Es ist eine Brennwertkessel mit integrierter Wärmepumpe. Außerdem kann das System mit Erdgas, LNG, Biogas oder Wasserstoff betrieben werden. Der primäre Energieverbrauch ist geringer und damit wird eine höhere Einsparung als bei einer hybriden Wärmepumpe erreicht. Kurz gesagt: ein SuperHybrid.