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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Jul 23, 2025
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Topics: 16 / Replies: 2636
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

A header (or low loss header - LLH) can be identified because flow from HP and flow to emitters and return from emitters and return to HP al...

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Ecodan - Auto Adapt

Weird that the Mitsubishi engineer says no. My (vaillant) sensor was specifically placed by my installer somewhere in permanent shade, with no chance...

4 months ago
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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

I thought that but it seems to go to the UFH not the DHW and it should still be warm assuming its from the return, so surely one would insulate it?

4 months ago
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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

I have been trying to work that out from the photos. Still not sure, but like you I suspect that there may be one and it might account for a 10%+ eff...

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Anyone able to provide some feedback before I make my finale decision? Samsung vs Baxi vs Vaillant

How odd. Or maybe they have now realised that they are in a competition!

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

... Isn't great advertising! Or is that too cynical?

4 months ago
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Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

Honestly no idea. The simple thermodynamics say that lower DT is always better. I have not heard a coherent explanation why we design for DT 5 not...

4 months ago
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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

Good I guess these operate the actuators on each loop but maybe one on each manifold operates the zone valve? If tyhere is nothing else to set high ...

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

No, that wouldn't account for the flow temp being lower than the return temp. This shows that the water pump continues to operate and as a result the...

4 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

I think what will actually happen is that the deltaT from flow to return will decrease. There may be a slight increase in energy to the house (becaus...

4 months ago
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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

If they arent permanently open then yes they would cause a problem (unless they are all wired to close simultaneously when the DHW comes on - instead ...

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

Sofaik all others do the same, ie they operate the refrigerant circuit in cooling mode to effect defrost. They thus cool the house and warm the heat ...

4 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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