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Judith

@judith

Member

Prominent Member

Joined: Nov 28, 2023
Last seen: Apr 24, 2026

Topics: 4 / Replies: 515

AllTopicsReplies

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...

2 months ago

Forum

Air Source Heat Pumps (ASHPs)

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...

2 months ago

Forum

Air Source Heat Pumps (ASHPs)

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

Forum

Air Source Heat Pumps (ASHPs)

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

Forum

Air Source Heat Pumps (ASHPs)

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

Your Home

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

Forum

Air Source Heat Pumps (ASHPs)

RE: Volumiser required on Grant R290 air source heat pump?

Thats generous! Does the small print of the grant allow DIY? In UK it has to be a MCS registered professional( doesn’t guarantee competence) and repla...

3 months ago

Forum

Air Source Heat Pumps (ASHPs)

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

This week was very mild here so our 7kW heat pump reports a COP for the week of 4.8 for combined heating and DHW. Our house requires ~8kW when -5C whi...

3 months ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Electricity price predictions

@dr_dongle we use Cosy (another octopus tarrif and together with the battery in January our average electricity price was 18p. So we used more on some...

3 months ago

Forum

Electricity, Tariffs, Monitoring, Electrics & Providers

RE: Air Changes per Hour - ACH and the MCS requirement

The generally accepted ratio from the 50Pa test to natural usage is 20. But I wanted to understand why and can’t now re-find the references I used to ...

3 months ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Air Changes per Hour - ACH and the MCS requirement

Mick Wall has a very thorough measurement set of air changes per hour for his house, on his web site/p>

3 months ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Cascade 2x Grant Areona 10kw ASHP - Ongoing setup issues

@adam awesome trouble-shooting I’m seriously impressed. Congratulations so far!

3 months ago

Forum