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Last seen: Nov 3, 2025
@prjohn thank you. That's 214 w/m2. As a note we were 244 w/m2, so about 10% higher than yourself in terms of heat demand per m2. I'm sure there a r...
@prjohn what's your floor space area you are heating? Would be good to understand your w/m2 to put the 24kW figure into context
64kW used and 184kW delivered yesterday in total for CH. COP 2.55 w/m2 244
@editor shading is killing me at the moment. Must be costing me 20kW a day, minimum
@editor if it makes you feel better, we've used about 80kw today with heating, hot water and general life - so you avoided all of that
@kev-m we are now at 49kW used and the average ambient has dropped to 4° Heat delivered 145kW COP: 2.95
@derek-m I think the sensors are integral. The only external sensor is in the hot water tank. Perhaps @grahamh can help. He seems to be the man who kn...
@derek-m as ever I'm always appreciative of the knowledge on this forum. All I was trying to say is that all models are built on a range of assumption...
@hr_3 depends on the rooms. 5 everywhere and then adjust the bedrooms as needed.
@keithh it didn't come up. However our upstairs is crazy in terms of insulation. It's 300mm solid between the walls, then 50mm on the outside plus 400...
@hr_3 do you know your current heating use in kW? You can just divide this by the total area of your house and that's your w/m2. However this will var...
@derek-m yes but that data came from the manufacturer about their performance based on lab testing. I can imagine in the real world the system is simp...
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Latest Posts
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RE: To re-pipe or not to re-pipe? Moving from oil boiler to air source heat pump.
@penval, really useful update. After all the discussion...
By Mars , 1 hour ago
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RE: Who's your electricity provider and what's your tariff?
@papahuhu I prefer to look at it simplistically. We d...
By Old_Scientist , 22 hours ago
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RE: How Accurate Is My DIY Heat Loss Calculation?
D'oh - of course. I shouldn't post before my brain is f...
By Old_Scientist , 1 day ago
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RE: Questions about A2A for heating as well as cooling
@rob-of-york I would concur with the underfloor insulat...
By Toodles , 1 day ago
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RE: New Vaillant Arotherm controls link to existing thermostats ; wired vs wireless
Nothing attached! I have rads but UFH makes the case ...
By JamesPa , 1 day ago
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RE: Cooling with air to water heat pumps
Passive cooling should always be the first call. Keep ...
By JamesPa , 1 day ago
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RE: Do I add Air Con or MVHR to existing A2W ASHP?
@rob-of-york Thank you, I’m thinking along these same l...
By Toodles , 2 days ago
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@Mars Good questions! The downstairs unit did the maj...
By Rob of York , 2 days ago
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RE: Volumisers in Heat Pump Systems: Does Placement Matter?
@dave, I think @jamespa has probably identified the mos...
By Mars , 3 days ago
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RE: Plug and play solar. Thoughts?
My thought is simple. Bring it on and bring on plug in...
By JamesPa , 3 days ago
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RE: Heat Geek mini store vs pump size
Yes I agree, that’s why Heat Geek have most likely sele...
By Tomtheheatingengineer , 4 days ago
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@tomtheheatingengineer, thank you, and welcome to the f...
By Mars , 4 days ago
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RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
@majordennisbloodnok @tomtheheatingengineer For my ...
By JamesPa , 4 days ago
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RE: Is the "divide by 2900" rule still valid?
Really flow rate is a pipework limitation not a water p...
By JamesPa , 5 days ago



