- Hydronic heating
- Product info
- Radiators
- Renovation
- Energy saving
Energy-efficient low temperature radiators for heat pumps: a comprehensive guide
Energy-efficient radiators vs. underfloor heating
Most people still automatically link the installation of a heat pump with underfloor heating and a costly installation. Although radiant heating solutions, such as underfloor heating, are certainly a good match, they are not the only available options. Modern panel radiators or (ultra-)low temperature radiators provide an excellent alternative to transfer the required energy in properly insulated buildings.
This opens up possibilities for both new build and renovation projects. For example, underfloor heating can be supplemented by energy-efficient radiators in new buildings to enjoy the best of both worlds. In existing buildings, on the other hand, it can be more convenient to simply replace the existing radiators with modern low temperature radiators for heat pumps without much construction work.
Low temperature radiators for heat pumps as the energy-efficient alternative
When switching to low temperature heating in an existing building, the condition and lifespan as well as the performance of the old radiators should be checked. If they don’t allow for the flow temperatures to be lowered so that the heat pump can work most efficiently, it’s best to replace them with low temperature radiators. Moreover, it’s also important to ensure that areas such as the windows, roof and walls are sufficiently insulated to reduce heat loss and maximise the efficiency of the heating system.
In order to select the best fitting radiators for the heat pump, the heat load must be recalculated for each room. Depending on the degree of insulation and the newly calculated heat load, the lowest possible flow temperature can be determined next. If the calculated temperature is higher than 45°C, modern panel radiators can be used. If it’s lower than 45°C, it’s best to use fan-supported panel radiators, such as Ulow-E and Ulow E2, or fan convectors since there is increasingly less natural convection below this temperature level. The fan support then ensures that even with low system temperatures the rooms can be heated to the desired temperature.
Which low temperature radiators best match with a heat pump?
Naturally, you don’t want to install just any radiator. It needs to fit in well with the interior design and the room layout. To cater to different tastes and budgets, we offer a variety of options in our radiator range.
If the flow temperature is 45°C or above, these energy-efficient radiators are a perfect match for a heat pump system in a modernised and properly insulated building:
- Compact, for example, is the most economical solution. has a modern design with a decorative flat front panel that is embossed with fine lines.Ramo Compact has a completely flat front panel that creates a sleek look for an easy integration in any décor. Plan Compact
- If the pipe network is renewed, radiators that allow for an almost invisible connection are also suitable. Vertical designer radiators such as Faro V, Kos V are a good example. Due to their height, these radiators offer a powerful heat source in interiors where there’s not much available wall space. Tinos V and Paros V,
As previously stated, other heat emitters are more suitable when the flow temperature drops below 45°C.
- Ulow E and Ulow E2, for example, are ultra-low temperature panel radiators powered by innovative technology that automatically switches on the integrated fans when needed to support the natural convection of the radiator. This allows for the same or better heat output with lower system temperatures compared to a standard radiator, which in turn improves the performance of the heat pump and reduces energy consumption as well as utility costs. Because heat is delivered more effectively, fan-assisted radiators are often also more compact, which makes them ideal for retrofitting in rooms where space may be limited.
- the iVector S2 fan convector not only offers high outputs in low temperature heating due to its integrated fans, but when paired with a reversible heat pump, also has full cooling functionalities. Thanks to the built-in controller that regulates the system’s parameters, optimal indoor comfort is thus guaranteed all year round. The sleek Italian design and the various installation options, ranging from wall-mounted or in-wall to on or even in the ceiling, allow for a smooth integration in any interior.
Sizing and balancing low temperature radiators for heat pumps
Once you’ve selected the best radiators for your heat pump system, it’s very important to size them correctly. This will ensure that, regardless of the model chosen, you’ll be able to maintain comfortable indoor temperatures. Based on the lower output temperature of the heat pump, our product calculator can already provide a good basis for the calculation.
On top of that, it’s essential to ensure the flow rate is optimised for heat pump operation. Heat pumps typically need higher flow rates to transfer enough heat at lower temperatures. In case of renovation, the existing pipe network must be checked for the new conditions and adapted if necessary.
Low temperature radiators for heat pumps at a glance
Download our infographic for a quick visual summary of the key points covered in this blog.
Should you have any questions or want to know more about our low temperature radiators for heat pumps, don’t hesitate to contact us. We are happy to assist you with tailored advice.