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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Jul 22, 2025
Profile Activity
Topics: 16 / Replies: 2632
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RE: Setback savings - fact or fiction?

You are almost right and have appreciated the key point ie that energy lost must be replaced (simple minded, and incorrect, thinking says that if you ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

Based on the numbers I think its likely its oversized. Not a disaster but it means it will probably cycle on and off a lot. If does prove to be over...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

That sounds high for UFH. Strongly recommend you follow the procedure I outlined upthread and report back. You should hopefully be looking at a flow...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

Yes absolutely. Exactly, the manifold has the equivalent of a radiator LSV and a radiator TRV (the actuator) together. With a radiator you a...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: What is the best strategy for operating a very oversized heat pump?

Oh definitely. Getting the WC curve optimised is a key part of the commissioning which, realistically, installers cant be expected to do because it n...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: What is the best strategy for operating a very oversized heat pump?

Thats an interesting one - as a matter of fact which (is it the Ecodan twin compressor model?) Indeed, loads of 'models' but in fact only one...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: What is the best strategy for operating a very oversized heat pump?

True, but the average householder isnt going to do this. Indeed so. Does it even need to happen though? Those who have responded want to 'tak...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

You need to follow a process Turn all room/central thermostats up to maximum Set the heat pump to run 24x7 Ensure that the Ecodan is in weather ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

Can you explain this please, the heat pump manufacturers always specify COP according to LWT. The compressed gas must be hotter than the LWT otherwis...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Volumisers in Heat Pump Systems: Does Placement Matter?

There is absolutely nothing wrong with buffer tanks in principle. The problem lies with the execution which all too frequently, it seems, involves poo...

4 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Replacing knackered oil boiler with ASHP - Perthshire

On the basis that 1l oil = 10kWh and 1cu m wood = 2500kWh, the total is between 25+10=35 and 40+10=50 MWh per annum. That's definitely in the same ge...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

That's really scary, of all the settings it's the probably most important one, and one which the installers cannot possibly get right because they don...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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