You are reading a single comment by @ectoplasmosis and its replies.
Click here to read the full conversation.
-
If by ‘electric’ you mean ASHP, then it’s exactly the same as a ‘system’ boiler, with a hot water tank, pump, buffer/volumiser as necessary, rads, wet UFH etc, with the only difference being that you have an outdoor monoblock heat pump unit heating the water being pumped instead of an indoor gas boiler. The only direct electric resistance ‘element’ in the system might be a backup immersion heater for the hot water cylinder, but this isn’t essential.
The flow temperatures should ideally be lower with ASHP, therefore any rads should be larger.
As for the EPC requirement, you can check if your house has one on the gov.uk website, most do. If it doesn’t, obtaining one isn’t hard or expensive.
ectoplasmosis
ffm
That's really interesting. This bit confused me as to how you're meant to apply if you're getting a whole house refurbed including insulation and an ASHP in place of a gas boiler:
"Your property must have a valid Energy Performance Certificate (EPC) with no outstanding recommendations for loft or cavity wall insulation."
https://www.gov.uk/apply-boiler-upgrade-scheme/check-if-youre-eligible
...but you're still applying for the grant despite getting everything done at once?
I'm not thinking that PV would heat the house under all circumstances. I think we'd have to rely on a combi boiler a bit, but we could substantially reduce our use of it from the PVs. What I'm struggling to understand is what an electric wet-UFH system looks like. Where does the element go? Is there a buffer tank and an expansion vessel? How big are they?