Vaillant Arotherm yeild and COP readings

BristolJoe · 2022-11-03T20:21:37Z

Hi all I'll get straight to the questions Is Vaillant's working figure a reasonable measurement of COP? If so why do they not call it COP?! I have also heard the 'Energy yeild' quoted is not very accurate. Can anyone with an arotherm and independant monitoring say how their heat meter compares with quoted 'energy yeild' ? The back ground: I have recently had an arotherm 7kw ashp installed. It is functioning really well. I have tuned the setting and I think it has improved the COP but I have had a 'Working figure' from the heating as high as 7! It has been warm outside and flow is under 30 degree most of the time, but seems a bit too good to be true! DHW set to 47 with weekly legonella. Working figure for the month is 4.4 . Again seems pretty amazing compared to what I have read. I only have the vaillant weather comp unit and the control unit. No sensoconfort. I have not got an independent heat meter. I do have a independant electricity meter for the ashp. As with most people on here I plan to monitor it over time but without understanding if the numbers are meaningful it's difficult to see if I'm improving. Thanks in advance. Joe

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Air Source Heat Pumps (ASHPs)

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cathodeRay

(@cathoderay)

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Joined: 4 years ago

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24/02/2023 8:51 am

@kev-m - yes, a new thread does make sense. Something isn't right, and because I am me, I want an explanation! For now, I can confirm most of your assumptions about my set up are correct, and it does indeed have a plate heat exchanger. I'll start the new thread once I have got the next Beginner's Guide to heat Pump Monitoring post done, it is long overdue.

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

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Yogabob

(@yogabob)

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Joined: 3 years ago

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13/12/2023 3:41 pm

@drew-pa Hi -

I know this is an old thread, but I am doing some work on my system once more, and thought I might say something which I feel is important.

Just because Vaillant calculate their 'COP' that way doesn't make it right. It produces a figure that looks far better than simple kWh input-to-kWh output, a simple ratio and is the only sensible way to compare S/COPs, especially across multiple manufacturers. Vaillant's 'calculation' is dissembling or plain distraction from the true COP, or ratio between power in to power out. Otherwise it is perfectly meaningless to the average punter, who is perhaps not so arithmetically inclined as some.

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ectoplasmosis

(@ectoplasmosis)

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01/10/2024 11:47 am

@yogabob Why then do the Vaillant 'CoP' figures more or less marry up with those obtained from independent monitoring systems, as per numerous records via Open Energy Monitor?

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