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GrahamF
GrahamF
@grahamf
Member
Estimable Member
Joined: May 2, 2025
Last seen: Oct 25, 2025
Profile Activity
Topics: 4 / Replies: 77
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RE: Heat loss calculations and how they work in conjunction with heat pump sizing

Yes that is a very fair point. I was thinking of the situation where you really need a 10kW heat pump, but install a 12kW or 16kW. Other items could...

2 weeks ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
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RE: Heat loss calculations and how they work in conjunction with heat pump sizing

@jamespa thanks for sharing your analysis. We have a commercial scale gas meter installed. We used to have two boilers, but then moved to a single 4...

2 weeks ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Heat Pump Installers: Competence, Illusion and the Hard Truth Homeowners Must Face

@ashp-bobba wow that is such a professional approach. I am really impressed!

2 weeks ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: Heat loss calculations and how they work in conjunction with heat pump sizing

Yes, I agree with your points. However, the risks are different in nature. If you oversize a heat pump, then the risk is that it is less efficient. ...

2 weeks ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Heat loss calculations and how they work in conjunction with heat pump sizing

@batpred I suspect there is probably a heat pump owner maturity curve. People start by trying to get the last 5% efficiency out of the system. The...

2 weeks ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Heat loss calculations and how they work in conjunction with heat pump sizing

@jamespa I am really impressed that your heat loss estimate was so accurate. May I ask what kind of house you live in? In winter, when we had the g...

2 weeks ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Heat loss calculations and how they work in conjunction with heat pump sizing

@jamespa yes, I agree it doesn’t need to be perfectly accurate - only enough to ensure you size the system to a reasonable level. Do you now have fir...

2 weeks ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Heat Pump Installers: Competence, Illusion and the Hard Truth Homeowners Must Face

@Fiona obviously redact any sensitive information.

2 weeks ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: Heat Pump Installers: Competence, Illusion and the Hard Truth Homeowners Must Face

@Fiona I am really sorry to hear about your awful situation. There are few things worse than being really cold in your own home. As @jamespa has su...

2 weeks ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: The Battery Battle

@agentgeorge Back to the Future with the flux capacitor!!

2 weeks ago
Forum
Energy Storage
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RE: Heat loss calculations and how they work in conjunction with heat pump sizing

@jamespa unfortunately, I don't think heat loss calculations can ever be terribly accurate. Our house was built in 1968 and has a real hotchpotch of ...

2 weeks ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Radiator sizing for heat pump installation by British Gas - are these correct?

Assuming the heat loss figures are accurate, the radiator sizings look sensible. We have Flow Regulating Valves (FRVs) installed on almost all our ra...

2 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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