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Does your real world SCOP match up or come close to the COP figures provided by your manufacturer? Poll is created on Nov 30, 2022

Real world COP exceeds manufacturer claims

Yes, both figures are really close

Real world COP is about 20% less than the manufacturer claims

Real world COP is about 40% less than the manufacturer claims

Real world COP is about 60% less than the manufacturer claims

Real world COP is about 80% less than the manufacturer claims

Real world COP vs. manufacturer claim

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Air Source Heat Pumps (ASHPs)

Last Post by Derek M 3 years ago

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Mars

(@editor)

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Joined: 5 years ago

Posts: 3593

Topic starter 30/11/2022 11:45 pm

The purpose of this poll is determine whether your real world, month-on-month, heat pump SCOP comes close to the manufacturer’s claims.

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Mars

(@editor)

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Joined: 5 years ago

Posts: 3593

Topic starter 30/11/2022 11:50 pm

Our lifetime COP is 2.7 and the published COP of our 18kW Global Energy Systems heat pump is supposed to be 3.46 at 45C flow temperature.

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cathodeRay

(@cathoderay)

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01/12/2022 12:59 pm

I'm trying to work out the best xxxgate name for this, as in dieselgate. A catchy name will do wonders for publicising the problem. COPgate may be the obvious ones, but to me it sounds like something is wrong with the police, which is probably true, but that's another story. Flowgate was another candidate, but to me it misses the mark. For a moment I considered FreedomGate but that unfairly picks them out. I open the floor to any other suggestions.

Midea 14kW (for now...) ASHP heating both building and DHW

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Oswiu

(@oswiu)

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Posts: 121

01/12/2022 3:49 pm

Posted by: @cathoderay

↑

I'm trying to work out the best xxxgate name for this, as in dieselgate. A catchy name will do wonders for publicising the problem. COPgate may be the obvious ones, but to me it sounds like something is wrong with the police, which is probably true, but that's another story. Flowgate was another candidate, but to me it misses the mark. For a moment I considered FreedomGate but that unfairly picks them out. I open the floor to any other suggestions.

Air-to-Watergate?

👍

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cathodeRay

(@cathoderay)

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01/12/2022 5:30 pm

Posted by: @oswiu

↑

Air-to-Watergate?

Very good, I think that will be a hard one to beat!

Midea 14kW (for now...) ASHP heating both building and DHW

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Mars

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Posts: 3593

Topic starter 01/12/2022 10:56 pm

@oswiul that’s very good. I may have to steal that as a headline for my next post that I’m working in.

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Subscribe and follow our Homeowners’ Q&A heat pump podcast

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Majordennisbloodnok

(@majordennisbloodnok)

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Posts: 999

03/12/2022 11:17 am

Not the easiest poll to answer since Mitsubishi publish multiple figures at different scenarios.

Perhaps more telling, though, is what the heat pump’s performance has been compared with what our installers gave as a ballpark figure; they said 3 - 3.5 and we’ve achieved 3.22. By any reasonable yardstick, I’d say we received a valid and accurate estimate and I’m happy with that.

105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"

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Derek M

(@derek-m)

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03/12/2022 12:54 pm

Did you need to make any changes to how your heat pump was initially configured to achieve that figure?

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Majordennisbloodnok

(@majordennisbloodnok)

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03/12/2022 1:43 pm

Nope. It’s running exactly as the installers left it, apart from putting it in holiday mode for a couple of weeks for the obvious reasons.

"Semper in excretia; sumus solum profundum variat"

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Derek M

(@derek-m)

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Posts: 4427

03/12/2022 1:49 pm

@majordennisbloodnok

You must have been lucky, and found a real Heating Engineer.

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Majordennisbloodnok

(@majordennisbloodnok)

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03/12/2022 2:47 pm

I was, @derek-m, and I’ve been recommending them ever since. I was particularly impressed when our next door neighbours invited them round to give a quote and they advised that the neighbours’ money would be better spent on insulation than a new heating system. Clearly not in it for a fast buck.

"Semper in excretia; sumus solum profundum variat"

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Majordennisbloodnok

(@majordennisbloodnok)

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03/12/2022 3:07 pm

In addition, @derek-m, that real world COP is being delivered by my (apparently very average - according to one expert) Mitsubishi unit. To me, that goes to show just how unimportant the choice of manufacturer is compared to the overall system being designed correctly. But then you knew that already and have been banging that drum since before I joined here, wouldn’t you say?

"Semper in excretia; sumus solum profundum variat"

👍

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