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Sandman1600
@sandman1600
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Estimable Member
Joined: Mar 13, 2025
Last seen: Oct 16, 2025
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Topics: 1 / Replies: 71
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

@dgclimatecontrol Thanks... this was resolved back in March/April.

3 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

@davidnolan22 Hi..! We've only just turned on the heating again following the summer but it's not overly concerning right now. It's cycling a little b...

3 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

@gary The tank is 210 litres. I work from home as a baker so I can use a lot of water during the day but using the old MegaFlo and oil boiler, we neve...

9 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

Thanks James, this is still something on the to-do list. I know there's more diagnostics to be done. I was just hoping the new pump would stabilise th...

9 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

Thanks. I still need to check this out. It's taken all my mental capacity to wrap my head around the heat pump. So it should be as simple as just adju...

9 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 haven’t looked at that side yet. But so far, the only thing that’s changed is that we’ve had the heat pump changed and COP is getting worse. I can s...

9 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

@jamespa It does appear to be going into defrost more frequently than the previous pump at similar temperatures. Would that account for the higher ene...

9 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

@jamespa Thankfully they didn’t touch the settings. They checked the pressure on the tank but that’s all.The only work they did was on the external un...

9 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

Just a follow up… first full day of the new heat pump… worst COP in weeks. COP down from a regular 3.4 to 3.8 to 2.7 yesterday (that’s just heating, n...

9 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

Just a bit of an update... thanks to the information you've shared with me, I was able to argue the case of the oversizing a little better.They revisi...

9 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

@jamespa Thanks James. The DHW COP is the worst we've had yet strangely. And there were no big drains on the water yesterday. It's like it's heating...

10 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

@jamespa Thanks for this.The COP for yesterday was 3.57 (heating 3.79 water 0.87) so the DHW eco setting might be making a difference but I'll keep mo...

10 months ago
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Air Source Heat Pumps (ASHPs)
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