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Last seen: Aug 17, 2026
I wish I thought we could say that with any certainty, but IMHO we cant. The simple physics (the physics is simple, but unfortunately results an dif...
OK, all as I guessed. So, if the HP is heating DHW when defrost occurs then the defrost energy has to come from the DHW tank, unless it switches awa...
When I first read this I thought 'no way thats going to work', but then I thought about it more carefully and I think it might. However Im not an exp...
Noted. The problem I have with the report on openenergymonitor is that the samples given are all at fairly mild OATs (-2, -3) and the analyst is maki...
@old_scientist I saw this thanks. I am currently treating this article with a bit of scepticism. I could imagine that the figures in the capacity ta...
Before answering that, what do you feel is the problem which you would solve by reverting. Earlier on you seemed to have made some progress albeit th...
Ah that makes sense (I thought you meant an OAT of 15C). It confirms that the problem is insufficient water available from the system for defrost. ...
It sounds like it has insufficient system volume for the defrost (energy for the defrost comes from the hot water in the system). This problem is sol...
@skidoc I dont think there is a particular reason to argue for a split system and it would almost certainly require planning permission. Its also un...
Mine did that also, I wouldn't be surprised if its common/written into the MCS contract template. You get about 3 emails from the BUS people either ...
Sorry to hear that. I have the 7kW Vaillant and, apart from an unfortunate increase in noise when its defrosting, its been excellent. Of course if th...
Quite possibly not, unfortunately. Houses have a significant heat capacity (thermal mass) which means that measurements over short periods of time c...
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