Underfloor heating and heat pumps: the ideal combination
Why underfloor heating is ideal for heat pumps
The combination of underfloor heating and heat pumps is widely considered one of the most efficient heating solutions for modern homes. In many newly built houses, underfloor heating has already become the standard heating system.
In an underfloor heating system, warm water circulates through a network of pipes installed beneath the floor surface. The entire floor acts as a heat emitter, allowing the system to distribute heat evenly throughout the room.
Because the heat emitting surface is much larger than with traditional radiators, the required water temperature can be significantly lower. This makes underfloor heating perfectly suited for heat pump systems.
Efficient heating with low temperatures
A key advantage of underfloor heating is the relatively low water temperature required for heating. In most systems the supply temperature ranges between 25 and 35 degrees Celsius. Traditional radiator systems often require temperatures between 60 and 80 degrees Celsius.
Lower temperatures allow heat pumps to operate more efficiently. The smaller the temperature difference between the heat source and the heating system, the higher the efficiency of the heat pump.
The efficiency of a heat pump is commonly expressed using the COP value (Coefficient of Performance). A higher COP means that the system can produce more heat energy from a given amount of electricity.
More information about these systems can be found on our page about heat pumps.
Comfortable and even heat distribution
In addition to efficiency, comfort is an important factor. Underfloor heating provides a very even heat distribution across the entire room. Since the heat rises gently from the floor surface, temperature differences are minimal.
Many floors consist of concrete or other dense materials that can store heat effectively. This thermal mass allows the floor to retain heat for a longer period and maintain a stable indoor temperature.
However, this also means that the system responds more slowly to temperature changes compared to radiators. For this reason, underfloor heating systems often operate most efficiently when the temperature is kept relatively constant.
Cooling with underfloor heating
Many modern heat pumps can provide cooling in addition to heating. During cooling operation, chilled water is circulated through the underfloor heating pipes.
There are several technical considerations when using underfloor cooling. If the water temperature becomes too low, condensation may form on the floor surface. In practice, a minimum water temperature of around 16 degrees Celsius is usually maintained.
Underfloor cooling can lower indoor temperatures by a few degrees, but its cooling capacity is lower than that of traditional air conditioning systems.
The importance of proper insulation
Good building insulation plays a crucial role in the overall efficiency of a heating system. The better the insulation, the less energy is required to maintain a comfortable indoor temperature.
The construction of the floor system also affects performance. Pipe spacing, circuit length and water temperature together determine the heating capacity of the system.
In many modern constructions additional insulation is installed beneath the floor to prevent heat loss to the ground.
Manifolds and heating zones
Underfloor heating systems typically consist of multiple circuits connected to a central manifold. The manifold distributes warm water to different zones throughout the building.
This zoning allows the temperature in each room to be controlled individually. For example, the living room can be heated more than a hallway or bedroom.
Which heat pump is suitable for underfloor heating?
Several types of heat pumps can be used in combination with underfloor heating. The most common solution is the air-to-water heat pump.
An air-to-water heat pump extracts heat from outdoor air and transfers it to the heating water used in the system. These systems are widely used because they offer good efficiency and relatively simple installation.
Ground-source heat pumps can also be used, although installation costs are typically higher due to the required drilling work.
Curious about the possibilities?
The combination of underfloor heating and a heat pump offers an efficient and comfortable heating solution. Proper system design and correct sizing are essential to achieve optimal performance.
