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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 8, 2025
Profile Activity
Topics: 17 / Replies: 2810
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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 ...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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 ...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

9 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
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...

9 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
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...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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 ...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

9 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Trying to work out COP

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

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: New 5kW Samsung Gen6 heat pump owner with loads of questions

No process is 100% efficient, so yes some is lost from pumps, electronics, pipework etc. I think Vaillant monitor deltaT and flow rate to calculate e...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Trying to work out COP

Overall about 43/15 = 2.85 However this is made up of space heating COP and DHW COP, which normally are quoted separately, because they are typicall...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
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