sirpatchuk

Even tho we are all at school and work Monday to Friday would it make sense to leave the heating on 24/7? From reading other posts maybe just have one zone downstairs as opposed to three zones..

I think the reason is too many horry stories on retrospective cavity wall insulation with damp getting in the house. It is 300mm rockwool in the loft

@SteamyTea This is with your storage heaters as opposed to an ashp?

When we moved in it was an old oil system. We are not on mains gas. Choices we’re LPG, stick with oil or ashp. We wave gone with ashp so now we need to make it work!

We have a Honeywell home control system. Each room upstairs has its own thermostat. Downstairs we have three zones, hallway, lounge, kitchen diner. I would be happy using 25 kW a day on the whole. It’s just that I have my thermostat set low and it’s still mild outside. Therefore I’m just worried about you said when it is very cold. With regards to the short cycling to source heat pumps produce a report to show how they’re working? I cannot compare yes a seat pump to what it used to be. We moved into our house in June 2021 and it was a dilapidated oil system with no thermostats etc. we struggled in the cold last winter without using heating. In January this year we had work done to our house which included the new radiators, UFH, ashp, solar panels, iboost. It was the 1st of May we move back in and as I say haven’t had I need to turn the heating on currently, until now. We are not on mains gas so that wasn’t an option. We either chose to stick with oil goes in a source heat pump which before was going to be the best long-term solution.

@Gone West It is a timber frame floor with between 75 and 100mm celotex. Not sure on the tog but both the tiles and carpet stated they were suitable for UFH

@SteamyTea thank you The underfloor is between 75 and 100mm depending on the size of the joists. We do have a buffer. I am not sure what you mean by “Hopefully it is modulating down to its minimum.”

I have also seen that the patio slabs are very wet (not from rain!) around the ashp… can anyone explain is this is normal…

Hi, We have had a Grant ASHP 17KW installed since May. We have solar panels and an iboost so haven’t taken much notice of the ashp because it hasn’t been on… until now. As it has been mild I have resisted turning the heating on, using our log burner in the evenings. It has now been on for four days. It is still relatively mild… and our KWH useage has gone from 5kw a day to 25kwh a day and that is with me keeping the temperatures low. 16 at night and 18 in day. We have a 1950s detached, 4 bed house in a village. No cavity wall insulation Good loft insulation Large radiators upstairs. Underfloor heating downstairs. This was fitted retrospectively and is plates with celotex underneath, chipboard on top and either tiles (kitchen/diner, hallway) or carpet (lounge) on top. The radiators upstairs come on nicely. The underfloor heating obviously is working as the temperature has gone up but it takes about 12 or more hours to go up 1 degree. It doesn’t feel warm to walk on and it cools very quickly. The KWH usage is a lot. I don’t know how to work out the COP. My installer has not been helpful. I am worried my ASHP is not working properly as it seems to kick in and out an awful lot - every 10 minutes or so and I can see the smart meter burning my money! We have weather compensation turned on and the flow temperature low. Can anyone help please! Thank you.