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	RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW By JamesPa, 2 weeks ago Forum Air Source Heat Pumps (ASHPs)
	@cbrenewable Hopefully the diagram shows one of the valves in the wrong place, otherwise there is a valve in the wrong place. Any idea why two pumps? Whats the house construction/level of insulation. ...
	RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's By trebor12345, 2 weeks ago Forum Air Source Heat Pumps (ASHPs)
	Your calculation of 13W per sqm fits well with what I found at 14W. So if I require 14W/m2 and the floor area is 179m. 179x14 = 2505. Does that mean I need a 2.5kw heat pump? There are 9 wall mount...
	RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW By CBrenewable, 2 weeks ago Forum Air Source Heat Pumps (ASHPs)
	@davidnolan22 - Please see diagram attached. *Edit - 1 issue in the initial version of the diagram. Attachment : Screenshot 2025-04-17 at 10.55.29.png Updated version attached.
	RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW By CBrenewable, 2 weeks ago Forum Air Source Heat Pumps (ASHPs)
	@bontwoody - thank you for that link on estimating power usage. Looks like there could be some good tips to help me monitor it which I'll look into further this evening. The external pipework is only ...
	RE: help sizing rads based on room by room heat loss By AdamK, 2 weeks ago Forum Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
	@jamespa heat loss list on first post. it’s the one that says nearly 2kw, I’ve just split it into 2 rooms as we’re going to put a sliding wall between the dining and living room, plus one rad is in on...
	RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW By davidnolan22, 2 weeks ago Forum Air Source Heat Pumps (ASHPs)
	@cbrenewable Hi, the graphs from Mel pump would be good. Can you draw your system, have you got a low loss header? or are you directly piped into the house on one big circuit with one pump?
	RE: ASHP Pipe sizes By Fingers, 2 weeks ago Forum Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
	That sounds exactly what I’m after thanks, I’m hoping to have the ASHP directly outside of the plant room so 2 75mm pipes straight through the wall, any thoughts on spacing and height from the ground?...
	RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's By JamesPa, 2 weeks ago Forum Air Source Heat Pumps (ASHPs)
	@trebor12345 Hi. What is it you are still trying to solve/understand. I will see if I can help. Definitely that is a 4 port buffer.
	RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW By JamesPa, 2 weeks ago Forum Air Source Heat Pumps (ASHPs)
	@CBrenewable A COP of 2.4 is definitely low and you are right to be concerned. You should be seeing 4 or better at present. Can you tell us something about the house (floor area, construction), Ar...
	RE: ASHP Pipe sizes By Transparent, 2 weeks ago Forum Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
	That's great @fingers ICF construction is known to me, although it's not used much in my area. Let's look first at the conduit needed to carry the main flow & return pipes through the wall.As it ...
	RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's By Heatgeek, 2 weeks ago Forum Air Source Heat Pumps (ASHPs)
	@trebor12345 @jamespa From the calcs you sent, your house conforms with modern insulation standards e.g. roof u-value 0.11. Your overall heat loss is 112.5 W/K or W/C. If your design temperature is -...
	RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW By bontwoody, 2 weeks ago Forum Air Source Heat Pumps (ASHPs)
	@cbrenewable Your COP does appear very low and if you don’t have a buffer that rules out one possible cause. The only thing that stands out as unusual is your DT which I would expect to be a bit highe...