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JamesPa
JamesPa
@jamespa
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Joined: Apr 3, 2023
Last seen: Sep 20, 2026
Topics: 27 / Replies: 5412
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

That's important. Hold onto it, gather any evidence. If somehow that can be combined with operational evidence then you may have a chance. Does m...

2 years ago
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

If you are going to have the discussion with the installers then I have some thoughts: it may be worth waiting until you have more data and have t...

2 years ago
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

@sandman1600 PS. I just checked your EPC, Its F rated with the potential for D. Its interesting to note that much of the fabric is 'assumed' ie t...

2 years ago
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

The total at the bottom of the 'heat loss calculations' column is why they specced 14kW. I note that the design FT is 45, which begs the question - w...

2 years ago
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

Im sorry to hear about the stress, just bear in mind that this is an expensive time of year, you wont be paying for heating at all in Summer, and ther...

2 years ago
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

@sandman1600 Id be interested to hear how are things going in terms of flow temperature and stability of house temperature? You may find that, as yo...

2 years ago
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RE: Heat Pump Sizing & Installation Costs

2024 200sqm 7kW 200l UVC 2 new rads, one new fancoil, one existing rad relocated (total 4 rads changed) 16A feed for heat pump already in pl...

2 years ago
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

A pair of similar tanks one white and one red are expansion tanks. You can tell because they have a filling nipple at the top and only one pipe leadi...

2 years ago
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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 ...

2 years ago
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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...

2 years ago
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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...

2 years ago
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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...

2 years ago
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