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They are efficient but do not have as high of an energy output as a smaller and cheaper gas furnaice. Apart from that, the water temperature is lower, so you ne
by edg5000 1y ago
They are efficient but do not have as high of an energy output as a smaller and cheaper gas furnaice. Apart from that, the water temperature is lower, so you need much larger radiators. Due to the lower energy output, you also need better insulation or a relatively massive heat pump. And the tech was not around 20 years ago (for reasons unknown to me).
- CalRobert 1y agoIs there a reason to use radiators and not just go straight to air to air pumps, which also have aircon?
- deleted 1y ago[deleted]
- neltnerb 1y agoFrom context I can't tell if they mean the heated coils in a heat pump head, or somehow connecting to a traditional radiator. In older homes there isn't necessarily HVAC at all and instead there are actual radiators. I've lived in two like that, there is just no forced air to rooms.
- CalRobert 1y agoYeah, European homes seem to have a love of radiators that I don't really understand; I hate mine. Ugly and huge.
- flakeoil 1y agoThe water temperature which you deliver to radiators are not defined by capacity of the heatpump, but how hot the radiators can be for safety/comfort reasons. If the radiators are too hot people could burn by touching them or stuff like platsic chairs would melt. Also the piping in the walls and floors cannot support too hot temperatures. The temp for water used in radiators 60-70C is easily achievable by an air-top-water heat pump. It does not depend on the energy source, gas/oil/electricity.
- adrianN 1y agoThe heat pump runs with much better efficiency at <50 degrees.
- ZeroGravitas 1y agoCondensing gas boilers similarly run more efficiently at lower temps. If the water returning to the boiler isn't below 54C then there will be no condensing at all, and the advertised 90%+ efficiency won't happen till the return value is more like 46C. That translates roughly to max winter temp of 65C leaving the boiler and lower when lesss heating is required. This can be tweaked by the end user and save 10-20% on heating bills.