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Judith
@judith
Member
Prominent Member
Joined: Nov 28, 2023
Last seen: May 14, 2026
Topics: 4 / Replies: 521
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RE: Why One Strike on Iran’s Oil Infrastructure Undermines Every Heat Pump and Solar Array in Britain

In June 2025 this academic group at Oxford modelled the impact on supply of LNG and hence price of closing the Strait of Hormuz. Their conclusion pric...

2 months ago
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RE: Who’s Caved and Switched the Heating On Already?

@editor yesterday we used 12kW of electricity for heat, so a cost@15p per kWh of £1.80. It makes me (and the cat) purr, keeping the house warm. Som...

2 months ago
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RE: ASHP Installation Issues Driving Me Crazy in Germany - Advice Needed

@expatingermany your pump sounds a bit like my Mum’s (gas) system when there was air in it. You might get some relief by bleeding the highest radiator...

2 months ago
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RE: Other than heat loss, radiator sizing, ASHP sizing, what else goes into a design and how important is it?

I totally agree with the recommendations from Mars and James. Perhaps our example might help. We had quotes for mostly an ashp of above 12kW, becaus...

2 months ago
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RE: Electricity price predictions

Ben Watts posted this analysis on LinkedIn showing the low overnight use is very much still prevalent, both over the last few years and in all region...

3 months ago
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RE: Need help maximising COP of 3.5kW Valiant Aerotherm heat pump

@martinrobinson & @davidb confirmed turning legionnaires cycle off via installers menu on control box DOES work, we put it off when we have visito...

3 months ago
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RE: Why Buffer Tanks & Low-Loss Headers Can Sabotage Your Heat Pump's Efficiency

@ch_18 downfield is completely correct but you should insulate your pipework as a first task. You must have an unnecessarily warm plant room at presen...

3 months ago
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RE: My 1950s Semi-Detached Heat Geek “ZeroDisrupt” Air Source Heat Pump Retrofit with Vaillant Arotherm

That shows a highly respectable COP of about 3 each month. Good choice on your part. How zero disrupt was it? Did you need upgrade of the pie work d...

3 months ago
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RE: Need help maximising COP of 3.5kW Valiant Aerotherm heat pump

The ashp measures exit and return flow temperatures which are usually designed for up to 5C. Thermistors have a measurement uncertainty of about 0.5C,...

3 months ago
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RE: Need help maximising COP of 3.5kW Valiant Aerotherm heat pump

@davidb you have said that your house is very well insulated and therefore your heating will be lower compared to your DHW usage. Michael de Posesta...

3 months ago
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RE: Propane gas canister price shock!

We moved to induction hob to be gas free. But I have to say it is MUCH nicer than gas, even quicker to warm up and obviously much easy to clean. We ...

3 months ago
Forum
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RE: Need help maximising COP of 3.5kW Valiant Aerotherm heat pump

Mick Wall has written up a good article about the modes, better than I can. Please ask more questions if you need to. There’s info on the app too.

3 months ago
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