Last seen: Nov 5, 2025
@alfapat Im even more confused now as looking at the house I wouldnt have guessed more than 8kW would be needed. Thats not an exact science I know but...
@alfapat The lockshield valve is the one opposite the TRV. Heat pumps dont play well with TRVs and they are not necessary when using water law. Just s...
@alfapat So the EPC pretty much matches the heat calculation. By all means tweak and see it that helps. If it doesnt then try to look at any upgrade...
@cathoderay I think you should qualify this with Air to Water heat pumps. Air to Air are quite capable of rapid heating for short periods of time in a...
@goody Its unusual for a heat pump to be undersized under the MCS protocols, its usually vastly the opposite. Cant you just swap it out for a bigger o...
@zoomuno You dont have to run it 24/7. I dont. However if you really only use the heating very sparingly then I think perhaps and air to air heat pump...
@goody I can only assume you had a terrible install? My heat pump is much cheaper to run than the gas combi I had previously and my house isnt very we...
@alfapat So the problems you have are that your house has a large heat loss (Im assuming it is a big house), your system was designed to run at a h...
@alfapat so buffer tanks act as a big roundabout for the water. Flow comes in from the heat pump and back and water goes to the heating circuit and ba...
@alfapat OK. thanks for the information. It looks like your system was designed to run at 50C when at -4C outside. The yearly electricity use for s...
@alfapat Sorry, missed the (large) tank comment 🙂 OK if the original install was for 25 kW then the 16 kW alone probably isnt oversized, but it su...
@alfapat Thats the document! unfortunately I cant read it from the images, they are probably compressed for the forum. I will pm you my email address,...
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