The majority of heat pumps have an operating temperature limit of 50°C – 55°C in most applications. Reducing the output temperature required from the heat pump will increase its performance; ideally the flow temperature should be 35°C for UFH systems and 45°C for Fan coil/Low temperature radiator systems
As mentioned by others, air tightness is key to this. Was the house tested? What was the result of the air tight test?OK, some great info there. The house is air tight 'in theory' but we do have an issue with our front door (which was never replaced when the house was renovated). Basically there is a gap between the lower part of the door and the frame (the door is slightly warped) so obviously the house isn't actually air tight atm. Obviosly its something we have to sort out but wondering is this something that would have an enormous impact on our heating?
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