NEW Air Source Heat Pump - house is cold :(

[Johntheo5]

I live in an old property. I've had internal wall and loft insulation installed. I've had a new ASHP installed last week and my biggest fear seems to be coming true. The house is just really cold. The radiators are warm at the bottom but mostly cold. The temperature in the house won't get above 17.8 degrees and the ASHP is running constantly to achieve that. It's about 8-10 degrees outside currently.

Any tips? (other than putting the old oil boiler back!)

What output was your old boiler and any idea of the ASHP output, also as pointed out the rads shouldn't just warm at the bottom even if the flowtemp is "only" 36C they should be at least lukewarm all over.
Do the new rads look physically larger than the old, also if you could run with a flow temp of 45C then you will get ~ 33% rad output vs say 20% (of 50deg rad).

 

[simondyntDBeK]

Interestingly I've just turned the radiators in the two bedrooms right down and now the remaining rads are feeling much warmer all over. What might this mean?

 

[monkeysballs]

Rads aren't balanced

 

[Johntheo5]

Possibly the heat pump is too small but neeed more details of output etc

 

[Bod ...]

Is the house insulated enough?

 

[monkeysballs]

Heatpump too small and house not insulated enough are the same thing the pump is designed to replace the energy lost by the house at a set outdoor temp if it looses more than that the pump is too small if it looses less than that the pump is bigger than strictly needed

 

[kidgreen61]

Chuck the ASHP in a skip and go back to gas

 

[vulcancontinental]

I live in an old property. I've had internal wall and loft insulation installed. I've had a new ASHP installed last week and my biggest fear seems to be coming true. The house is just really cold. The radiators are warm at the bottom but mostly cold. The temperature in the house won't get above 17.8 degrees and the ASHP is running constantly to achieve that. It's about 8-10 degrees outside currently.

Any tips? (other than putting the old oil boiler back!)

Part L Building Regs; replacing a fixed appliance with one with an efficiency less than the one being removed is contrary to regas. Should be HP or a better efficiency appliance than the HP.

 

[muggles]

Interestingly I've just turned the radiators in the two bedrooms right down and now the remaining rads are feeling much warmer all over. What might this mean?

Could be as simple as the circulating pump isn't keeping up, or could be that the heat pump is incorrectly specified. What circulating pump was fitted?