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Johnmo
@johnmo
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Noble Member
Joined: Jan 25, 2023
Last seen: May 23, 2025
Profile Activity
Topics: 2 / Replies: 537
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RE: British Gas versus Octopus: Two possible heat pump routes - how to evaluate them?

Think you have missed the point, why would you want to go above 50 in any likely outside temperature. Your design temp is the 99.6% likely temp. Not s...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Looking for help with a Mitsubishi FTC2BR controller

In addition to my reply on Buildhub. Have you considered dumping all the third party rubbish and then you have no need for the FTC2BR. I doubt you n...

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

Interesting fact from 2003 - 2 years before condenser boilers became mandatory. Defra; the heating industry; the Energy Efficiency Partnership for H...

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

No that is 2.2 m³/h, so 2200L/60 mins, is 36.66L/min. So the head flow curve is just about identical on speed 5 and max flow on the secondary pump. ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Prepping for the Heating Season: What’s on Your Heat Pump Checklist?

We have had rubbish weather all "summer" our heating went on a month or so earlier than usual. Plus was used for cooling during the summer when need...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: British Gas versus Octopus: Two possible heat pump routes - how to evaluate them?

The big companies just want to do the bear minimum, for max profits, then point you at a tariff, to keep cost manageable, and that may disappear in a ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Aira Heat Pump: Stylish Scandinavian Heating

Good indication your flow temps are way to high. Looks like you may have started balancing at the wrong end of the system. Maybe caused a preferenc...

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

Comparing your heat pump, circulation pump and the secondary pump curves they are very similar. So assuming the heat pump isn't 10s of metres away the...

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

I have zero issue with a heat pump being oversized. Actual house loss at -3 is 3kW and our installed heat pump at -3 is 6kW. So able to deliver double...

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

First to make the buffer to a volumiser, you need to compare the secondary to pump capacity and head curve. This should be easy enough for the plumber...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pump domestic hot water.

@david999 £2 per day just for DHW? If so, you really need to sort out your settings. It should be well under half that amount on a standard tariff. On...

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

So you have a very different system. You have a thermal store, so the heat pump only produces a single flow temperature. Based on being 2009 install y...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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