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Underfloor heating is a popular, modern and comfortable way to heat your home. However, for it to work properly and efficiently, it is essential to ensure high-quality control of the water flow. And that is exactly what the circulation pump takes care of.
Compared with radiators, underfloor heating has a large surface area and a lower water temperature. The heating water is distributed across the entire floor area, ensuring a high level of thermal comfort even in large rooms. However, if the water is not distributed evenly, is not at the correct temperature, or flows too slowly, both efficiency and comfort decrease.
The key, therefore, is to ensure sufficient and constant water circulation in the system, so that the correct flow rate and temperature differential are maintained in all circuits. This is why the circulation pump plays an irreplaceable role in underfloor heating.
An incorrectly selected or poorly positioned heating circulation pump means that rooms further away will remain cold, because sufficient flow is not ensured in circuits with higher hydraulic resistance. This naturally leads people to turn up the temperature on the thermostat, resulting in inefficient overheating. In addition, the wrong pump can cause unpleasant noises in the system.
Besides the circulation pump, the efficiency of underfloor heating is also influenced by the heating water temperature (typically 25–40 °C, depending on the floor build-up, pipe spacing and heat losses), underfloor heating control, the type of heat source (a heat pump is ideal for underfloor heating), hydraulic balancing and venting of the system, as well as regular maintenance and water filtration.
A well-designed underfloor heating system will ensure even heating even in large rooms
When choosing, focus exclusively on modern electronic circulation pumps, which automatically respond to demand and adapt their operation accordingly. As a result, they can consume up to 90% less energy than old three-speed pumps, which run at constant output regardless of changing requirements. This is, of course, both uneconomical and environmentally unfriendly. Due to high consumption and inefficiency, this type of pump can no longer be manufactured or sold within the EU.
For underfloor heating in most standard installations, we recommend pumps with constant differential pressure, which ensure even heat distribution across the entire area. The highest-quality electronic circulation pumps offer various smart functions, such as the AUTOADAPT function found on Grundfos pumps. This function allows the pump to operate fully automatically according to current operating conditions, so you do not need to adjust the settings at all.
Functions such as automatic pump venting, an integrated dirt filter, or dry-run protection are also very practical. These and other features are offered, for example, by top-of-the-range pumps such as the Grundfos Alpha2 GO and Wilo Yonos PICO.
Grundfos Alpha2 GO electronic circulation pump with AUTOADAPT function
Also pay attention to the pump’s technical parameters. These are important to ensure the pump matches your heating system and operates correctly. Key indicators include:
When selecting an electronic circulation pump for heating, the most common mistake is undersizing or oversizing it. Parameters such as power, flow rate and head must always take into account the specific characteristics of the heated building and the heating system. Otherwise, the heating may not warm evenly, may have unnecessarily high consumption, may wear out faster, or may be noisy.
Before commissioning, people also often neglect thorough venting and balancing of the circuits. However, do not underestimate this step—it can cost you money as well as thermal comfort.
When controlling underfloor heating, take into account its high thermal inertia. This means that, compared with radiators, it takes longer to heat up and longer to cool down. Underfloor heating therefore needs to be switched on and off with sufficient lead time. Some thermostats for underfloor heating even have a function that calculates the required time for you.
As you can see, choosing the best circulation pump is quite complex, yet crucial for both your comfort and your savings. If you are unsure what to choose, do not hesitate to contact us.
Our heating technology specialists will be happy to recommend suitable products from our range, taking into account the technical specifications of your house and heating system as well as your individual requirements. We offer circulation pumps for all types of heating systems, including combinations of underfloor heating and radiators. Choose top-quality pumps from leading global manufacturers such as Grundfos and Wilo.
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