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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Jul 15, 2025
Topics: 16 / Replies: 2621
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

@sandman1600 just looking at the plots here it looks to me like there is in fact a range of outside temperatures where it does not cycle, casting doub...

4 months 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 think your heat loss is between 4.5 and 8.5, the r290 is probably a goodun because of its.unusually large modulation range, due to having two c...

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

Further to the above here is a template for what you might say if you wish to decline sign off. ? indicates info from melcloud or elsewhere, or refer...

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

I should add that I still think you can get it working well as it is, so if you don't think it's worth trying to press the installer then let's focus ...

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

@sandman1600 Whilst I agree with hat you may end up batch heating at a higher ft, at this stage I would continue to get to the ft that just heats th...

4 months ago
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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...

4 months 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...

4 months 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...

4 months 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...

4 months 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...

4 months 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...

4 months 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...

4 months ago
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