Ecodan ASHP - How to optimise my set up?

JakeT · 2024-01-19T18:14:16Z

Hi all, I've recently purchased a new build property that came with an Ecodan ASHP set up (details below). I have been reading / tinkering as much as possible, but given there is so much to learn I thought it would be best to ask a blanket question: "Are there any suggestions for optimising my controls / settings, given my situation?" Currently my COP averages around 2.2x, (Oct-23 to Jan-24), and to be frank - the overall consumption feels high Yesterday heating alone consumed 30kwh, delivered 62kwh (outside temps were below 5c the entire day), I guess if the COP was above 3x, then the consumption would be easier to stomach. Right so details on my set-up: (see schematic diagram below) 100% electric house Ecodan 6kW - PUZ-WM60VAA 283L Tank The roof has Solar PV (tiny 0.4kw) and Solar Thermal The property is a Semi-detached 3 story, 4 bedroom Zone 2 - (ground floor) - UFH (there are two Heatmiser room stats, 1x kitchen + 1x living room - all set to 18c) (I think the heatmisers are linked to the UFH manifold? See picture below) Zone 1 - (1st + 2nd floor) - rads (one Heatmiser stat located on the 1st floor - set to 17c) (all Rads set to fully open) Total floor space = 119m^2 Total property volume = 319m^3 EPC = A (92), with "very good insulation" Air permeability = 5.55 ( Currently two people living in the property (one who loves opening the trickle vents, and one who loves closing them. 🤣 ) Current settings: DHW Target Temp = 45c Weather compensation curve set to -10c = 43c & 20c = 25C (no idea if this is anywhere good??) Flow rate 9l/m (this was set at 3 in the Ecodan module, but there is also a Grundfos pump set to1? (see schematic diagram below) We don't have set back temps / timers A couple of observations so far: When we moved in all stats were set to 21c, the house was very warm and was consuming c. 55kwh a day for heating (outside temp c. 12c), we moved the stats down (although I am not sure if we shouldn't have just adjusted the weather compensation curve instead?) The hot water temp when taking a shower drops rapidly, like after three minutes even if I max out the mixer I can feel the temp dropping. (rain shower head, so consumption may be high?) The Ecodan seems to short cycle quite a bit (heatmisers are always switching between calling for heat / not calling for heat), this has gotten better since I flattened out the weather compensation curve. (see below pic of when it goes crazy) Any suggestions / comments on how to improve the COP of my set up? 😀

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rhh2348

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11/02/2025 5:01 pm

Posted by: @sliderule

↑
My experience is that lower flow rates cause more cycling - as higher temperatures are reached? Also do higher temperatures reduce the cop?

@sliderule - see my related earlier post, at https://renewableheatinghub.co.uk/forums/postid/42153

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Bamnio

(@bamnio)

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Joined: 4 months ago

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11/03/2025 12:15 pm

Thanks everyone for posting this, so much useful info to help me sort out a dodgy install

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