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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 18, 2025
Profile Activity
Topics: 17 / Replies: 2696
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RE: How can we prevent our LG heat pump from freezing up in cold weather?

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...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: My Journey to Finding the Best Heat Pump for My Home in France

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...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: My house is too big and the Vaillant 7kW heat pump can't heat it when temperatures drop below 4C

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...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: My house is too big and the Vaillant 7kW heat pump can't heat it when temperatures drop below 4C

@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...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

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...

6 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: How can we prevent our LG heat pump from freezing up in cold weather?

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. ...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: How can we prevent our LG heat pump from freezing up in cold weather?

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...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: My house is too big and the Vaillant 7kW heat pump can't heat it when temperatures drop below 4C

@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...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP install contract and BUS grant money

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 ...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: My house is too big and the Vaillant 7kW heat pump can't heat it when temperatures drop below 4C

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...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Compute heat loss from energy used

Quite possibly not, unfortunately. Houses have a significant heat capacity (thermal mass) which means that measurements over short periods of time c...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: How can we prevent our LG heat pump from freezing up in cold weather?

Hi Welcome to the forum. Please feel free to ask any questions. In order to help can you give a bit more detail about how it locks up, what is ha...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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