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Hybrid heating systems are combinations of what are usually two heating technologies that use different energy sources. Hybrid heating systems from the Vaillant Group can be used in detached homes and apartment buildings, as well as in commercial properties; they ensure eco-friendly and convenient heating and hot water. A hybrid heating system can also be a sensible solution for the renovation of existing buildings.

Secure supply and sustainability

Hybrid heating combines two or more heating systems. In most cases, these are systems that run on renewable energies and fossil fuels. In this way, hybrid systems mean property owners are not reliant on a single energy source.

Hybrid systems are often used to increase the share of renewable energies in buildings where environmental heat alone does not provide the desired level of comfort. This is particularly common in older or larger buildings. In this way, CO₂ emissions and energy costs can be reduced.

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If a heat pump is combined with a gas-fired condensing boiler in the hybrid system, the control system ensures, depending on the set-up, that the more cost-effective or eco-friendly heat generator is active and that both technologies are only in operation if required.

Thanks to their modular design, many hybrid heating systems are flexible and individually expandable. For example, the gas-fired condensing boilers from the Vaillant Group can also be subsequently combined with a heat pump or a solar thermal system to form a hybrid system (“renewable-ready”).

In many European countries, attractive subsidies are paid for hybrid systems.

How do hybrid heating systems work?

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In a hybrid system, an intelligent control system automatically ensures that, depending on the preference of the property owner, the more economical or eco-friendly technology is made available for heat generation and water heating. A hot-water or buffer storage is part of every hybrid system. It stores the heat generated and introduces it into the heating circuit of the building as required.

What kind of hybrid heating systems are there?

Different combinations are possible. The following variants are the most established:

Gas-fired condensing boiler and heat pump

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If a gas-fired condensing boiler is combined with a heat pump, a large part of the heating and hot water is provided by the heat pump. The gas-fired condensing boiler only provides support, specifically in the case of demand peaks.

Gas-fired condensing boiler and solar thermal energy

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When combining a gas-fired condensing boiler with a solar thermal system, solar heat is used for the provision of hot water and/or heating water. Depending on the design of the solar system, up to 30 per cent of heating costs can be saved in this way.

Heat pump and photovoltaics

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A heat pump requires electricity for heating and water heating, which is generated by a photovoltaic system in this combination. In the event of “overproduction” (primarily in summer), the excess electricity can be used for other devices and fed into the grid.