@derek-m the problem with that is trying to get it assessed in a consistent way? Taking into account numbers, ages of occupants? at home all day? impact of solar gain? some people heat whole house ... others heat one room only to say 20 or 21... etc etc

i've no idea if its possible to have a way of measuring heat loss in some way to get useful info. But again i'm sure there are many issues with trying to do that so it can be measured in all weathers & times of year!

Posted by: @mike-patrick

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@derek-m I like that idea as it's one number that everyone can understand. Hides a lot behind it but a useful heuristic.

Last year for mine (total energy use as ASHP not separately metered) was £70 per year per sq.m. Without others to compare I've no idea whether this is good, bad or typical. The only comparison I know of is my aged relative's house (80's built and well insulated). She uses almost 3x my annual kWh (28,000 KWh of gas and electricity). She can afford it but I've told her to use the coal-effect gas fire less and get a new thermostat for the hall as the existing one seems not to work.

Mike

For comperson I used 10000kw 5 people 230m². But it is a newbuild.

Posted by: @mike-patrick

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Posted by: @mike-patrick

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@derek-m I like that idea as it's one number that everyone can understand. Hides a lot behind it but a useful heuristic.

Last year for mine (total energy use as ASHP not separately metered) was £70 per year per sq.m. Without others to compare I've no idea whether this is good, bad or typical. The only comparison I know of is my aged relative's house (80's built and well insulated). She uses almost 3x my annual kWh (28,000 KWh of gas and electricity). She can afford it but I've told her to use the coal-effect gas fire less and get a new thermostat for the hall as the existing one seems not to work.

Mike

I meant 70 kWh p.a. per sq.m, not £70

 

I was thinking more on a daily or even hourly basis, since that may be more effective when adjusting the weather compensation curve.

One possible way to get a feel for actual heat loss, would be to warm your home to 21C, note the outside temperature and time, then switch off your heating system and time how long it takes for the indoor temperature to fall to 20C, noting the final outside temperature. 

By doing the above at several different outside temperatures it may provide the sloop of the heat loss.

It may then be possible to check the results against the calculated heat loss for your home.

@andris I used 7,000kw last year. Slightly bigger house 263m2, 4 people (2 young children).

So that's 26.6kw/m2 per annum

Posted by: @batalto

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@andris I used 7,000kw last year. Slightly bigger house 263m2, 4 people (2 young children).

So that's 26.6kw/m2 per annum

 

Did you include your solar generation in those figures?

@derek-m funny I was thinking the same.

@derek-m no, that's actual heat pump use regardless of source.

@batalto I see, my total of heating use is a bit of a guess as I don't have a meter. I use 10000kw total usage. Heating about 3500kw. Hot water 2500kw and 4000kw is washing drying all other electrical items.

I used about 6,500kw for power in the house. However a good chunk of that is my abusing the solar in the summer running AC, a pool heater and a hot tub. So not really representative lol

😀  that's awesome!. Hot tub sounds so good😍

I will just get a big paddling pool and fill it up for the kids for free! 

Can't wait to abuse the extra power too😍

More evidence that the EPC regime is not fit for purpose

The over-prediction of energy use by EPCs in Great Britain: A comparison of EPC-modelled and metered primary energy use intensity

Link