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GrahamF
GrahamF
@grahamf
Member
Estimable Member
Joined: May 2, 2025
Last seen: Oct 27, 2025
Profile Activity
Topics: 4 / Replies: 79
AllTopicsReplies
Reply
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)
Reply
RE: Repiping and Reconfiguring our Heat Pump System Including Removing the Buffer Tank - Heat Pump Retrofix

@editor   I am all in favour of provocative titles that make people pay attention. However, we also need to be careful. These shows ar...

3 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Repiping and Reconfiguring our Heat Pump System Including Removing the Buffer Tank - Heat Pump Retrofix

@editor Mars, it is really great that you have set up this forum for discussion and learning. Unfortunately, we always learn more from our mistakes t...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Repiping and Reconfiguring our Heat Pump System Including Removing the Buffer Tank - Heat Pump Retrofix

@editor thanks for being so open about all this. All of us like to be open about our successes, but it takes courage to admit when things have gone w...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat Pump Installers: Competence, Illusion and the Hard Truth Homeowners Must Face

@editor I hope you have at least a partially working heating system for the winter?

4 weeks ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: Seeking Help for In-Principle Quote to fix a botched heat pump installation by Heat Geek Installer

@drei are taking measurements from the heat pump, or do you have an independent monitor? The reason for my question is that heat pumps are not espec...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat Pump Installers: Competence, Illusion and the Hard Truth Homeowners Must Face

@editor oh dear, very sorry to hear about that. I hope you get it sorted soon.

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

@ashp-bobba fascinating explanation, thanks. I have a physics degree and worked as an IT architect for 40 years, so I can understand this kind of sy...

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

We should also consider the importance of the manufacturer's role in setting design guidelines for installers. As an example, Grant UK seem to reco...

4 weeks ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: Sizing - Save me from my headache

If you have enough space, you might consider opting for a larger hot water cylinder. That would reduce the risk of running out of hot water. However...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Seeking Help for In-Principle Quote to fix a botched heat pump installation by Heat Geek Installer

@drei your proposed radiator design looks inadequate to me. The first and second floors look OK, but a shortfall of 59% on the ground floor at 45C is ...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
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