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Last seen: Aug 25, 2026
Completely agree here. However, reducing it to the basics which I think we know irrespective of assumptions about COP or the accuracy of data from th...
I had understood the figures provided by @cathoderay to be measured electricity consumption (8 ish MWh/year) which he had multiplied by an assumed CO...
According to the databook the minimum output of the Midea unit at LWT55 OAT 7C is 9kW. So its cycling much of the time even if the 12.6kW calculated ...
Its easily done, I had to edit my response to get everything right. Yes if you have 12kW heat loss at -2 then you will need to inject 12kWh into the ...
Its easily done, I had to edit my response to get everything right. Yes if you have 12kW heat loss at -2 then you will need to inject 12kWh into the ...
I assume that the vertical axis is kWh/week (ie energy consumed/delivered in any one week), consistent with the title, can you confirm. If so oil pea...
As I said it depends on what you are trying to calculate. If you are trying to calculate heating load (ie what the house needs) then degree-days are ...
Be careful not to confuse kW (power) and kWh (energy). 12.3kW is the (calculated) peak power demand at the design temperature. To get to kWh/year yo...
@cathoderay Thanks The first observation I would make is this: 1100l oil per year is 11.4MWh. Even if your oil is 100% efficient that would sug...
@derek-m Surely that depends on what you are trying to calculate. Degree days will tell you about demand (load) profile whatever the heating technolo...
It deserves an explanation if collectively we can find one. You seem to have done many of the obvious things right, and it would be instructive to fi...
I havent found a source of hourly data over an extended period of time which is available for free (you can get about a months worth at a time here:/p...
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Degrees of Separation
Latest Posts
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RE: How Accurate Is My DIY Heat Loss Calculation?
@editor Thanks Mars, I have been enjoying playing with ...
By kilgorexv , 5 hours ago
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New Vaillant Arotherm controls link to existing thermostats ; wired vs wireless
I am feeling baffled and worried:We are having a an Aro...
By GutoFfowc , 8 hours 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 , 11 hours ago
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@Mars Good questions! The downstairs unit did the maj...
By Rob of York , 11 hours ago
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RE: Questions about A2A for heating as well as cooling
@donciccio I would suggest that you take a "fabric-fi...
By Rob of York , 12 hours 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 , 1 day 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 , 2 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 , 2 days ago
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RE: Who's your electricity provider and what's your tariff?
@chandykris Swings and Roundabouts, you win some…. ...
By Toodles , 2 days ago
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@tomtheheatingengineer, thank you, and welcome to the f...
By Mars , 3 days ago
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RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
@majordennisbloodnok @tomtheheatingengineer For my ...
By JamesPa , 3 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 , 3 days ago
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RE: The good, the bad and the not that great – my heat pump installation
@burtis, I’ve followed this thread pretty much from the...
By Mars , 6 days ago
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