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JamesPa
@jamespa
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Joined: Apr 3, 2023
Last seen: Sep 14, 2025
Profile Activity
Topics: 17 / Replies: 2843
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RE: Heat loss calculations and how they work in conjunction with heat pump sizing

That's fair enough and at 6kW being oversized isnt going to make much difference, and furthermore you probably want the extra oomph for DHW reheat. ...

12 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
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RE: Heat loss calculations and how they work in conjunction with heat pump sizing

The last sentence makes my blood boil! In what other industry would it be acceptable to insist on basing the key design parameter (heat loss) on dat...

12 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Mitsubishi PUHZ-SW120 ASHP & Buffer Tank

Unfortunately the plumber may be right, or he may not. Without doing the calculations (or the experiment) it's impossible to tell. However more o...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi PUHZ-SW120 ASHP & Buffer Tank

In addition to any response from @johnmo please read my post above which gives you some way to determine how much it matters . If the power consumpti...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi PUHZ-SW120 ASHP & Buffer Tank

Ok well in that case I defer to the more detailed comment by @johnmo above. There are ways to fix the pump capacity (if it's actually a problem). ...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi PUHZ-SW120 ASHP & Buffer Tank

Can you confirm: Does this model actually have an internal pump. Quite a few Mitsubishi models don't.

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

Stick to your guns (which I'm sure you will). Buffer tanks are, in most domestic cases, for the benefit of installers not homeowners. That being the...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 6 Red Flags to Avoid When Considering a Heat Pump Installation

ASHPs (and fossil boilers running at a low flow temperature or with weather compensation - rare in UK, common in more enlightened countries) supply at...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: In middle of ASHP installation - a few questions

Wall mounted Aircon units are very common. Many ashps include instructions for wall mounting. Perfectly legit as long as the wall is strong enough a...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP - a few (probably dumb) questions about the lived experience

I have been told over a period of time by several people in the industry that ventilation loss is one of the major uncertainties in the standard sprea...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP - a few (probably dumb) questions about the lived experience

Thanks for that explanation which is very interesting. Btw I'm not advocating homely, just citing it as an example of a technology which (reputedly) ...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP - a few (probably dumb) questions about the lived experience

I don't doubt its feasible, however there is extra cost and (physical) volume. Many modern heat pumps are pushing the 0.6cu m permitted development l...

12 months ago
Forum
Air Source Heat Pumps (ASHPs)
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