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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Nov 16, 2025
Profile Activity
Topics: 18 / Replies: 3386
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RE: Simulation of ASHP with Gas boiler as part of decision process

This is an area where the industry tendency to oversize can cause a real problem. I decided to start rad upgrades in advance so far for half of the ...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

Better insulation is best but of course bigger radiators may also be necessary to get tropical room temperature with low flow temperature. That's par...

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

My ashp journey is only 3 years old and in that time it's clear that thinking has matured quite significantly, albeit by no means universally. I can ...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

I did pretty much the same. The overall conclusion for me is that low and slow makes for a more comfortable living environment and it confirmed that ...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat loss calculations and how they work in conjunction with heat pump sizing

Thanks for confirming that the industry knew what it was doing (wrong). I guess it was just too easy to whack in an oversized boiler, turn it up to ...

1 year ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
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. ...

1 year ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
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...

1 year 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...

1 year 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...

1 year 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). ...

1 year 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.

1 year 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...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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