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JamesPa

@jamespa

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Illustrious Member

Joined: Apr 3, 2023
Last seen: Nov 14, 2025

Topics: 18 / Replies: 3362

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RE: Runing ASHP efficiently, general thought process. (Low and slow)

Basically yes!

11 months ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Heat loss calculators and spread sheets

Im not an expert by any means but, in the absence of any detail to the contrary, buildings are normally built to the standards required by building re...

11 months ago

Forum

Safety, Regulations, Tools, Plumbing & DIY Installations

RE: non-Mitsubishi owners - how much control do you have over your ASHP "freeze stat" function?

For me the sole purpose of the glycol or antifreeze valves is to provide backup protection if the power fails for any length of time; the freeze stat ...

11 months ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Placing objects next to an outdoor air source heat pump unit – what are the rules?

Most heat pumps have specs on minimum clearances, perhaps check this. That said I agree with @transparent that an open frame construction would be ...

11 months ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Hot water tank losing temperature quickly: Daikin Altherma 4kW

Agree. I changed mine because I reheat only once per day, which is fine so long as hysterisis set too high cause it to skip a cycle. However you see...

11 months ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Heat loss calculators and spread sheets

Thats interesting and exactly what one installer said to me. We seriously need to do a survey of door blower testers - @editor have you any contacts...

11 months ago

Forum

Safety, Regulations, Tools, Plumbing & DIY Installations

RE: Heat loss calculators and spread sheets

Based on my own experience there are installers out there who will use more realistic values for ACH and/or take note of measured data. They are in t...

11 months ago

Forum

Safety, Regulations, Tools, Plumbing & DIY Installations

RE: Hot water tank losing temperature quickly: Daikin Altherma 4kW

My 200l Vaillant DHW tank falls from 70 to 65 (immediately following a legionella cycle) in about 11 hrs, just shy of 0.5C/hr. Yours is quite a lot f...

11 months ago

Forum

Air Source Heat Pumps (ASHPs)

RE: New 5kW Samsung Gen6 heat pump owner with loads of questions

Completely agree that 'efficiency' is strictly incorrect terminology. The efficiency (of a heat pump) would be (something like) heat out/theoretical ...

11 months ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Heat loss calculators and spread sheets

I completely agree based on my personal experience, and I have now heard a sprinkling of installers say this, but is there any wider evidence that you...

11 months ago

Forum

Safety, Regulations, Tools, Plumbing & DIY Installations

RE: Trying to work out COP

... If as a result you can turn the flow temp down then that could make quite a difference!

11 months ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Trying to work out COP

So your heating COP is (30-4)/(10.5-2.5) = 3.25 Your DHW COP is 4/2.5 = 1.6 As you imply sacrificing COP for low cost electricity saves money. Its...

11 months ago

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