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December 8 2022 4.15pm

Energy Usage

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View doi209's Profile doi209 Flag Fighting for the weak and innocent... 12 Oct 22 5.28pm Send a Private Message to doi209 Add doi209 as a friend

I received an email from my supplier telling me of the new prices to pay per kwh of electricity and gas.

British Gas suggest high gas usage is 17000kwh/pa for a 5 bed house with 4-5 people for hot water and heating.

We are 2 people who shower each day and maybe 1 bath/week and our estimation is to be a whopping 31000kwh/pa.

A new boiler was installed 2 years ago and is being checked next week.

How does this compare to other beds / occupants ? We are frugal ( no heating on yet !!).

 

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View cryrst's Profile cryrst Flag The garden of England 12 Oct 22 8.59pm Send a Private Message to cryrst Add cryrst as a friend

[Link]

As a rule of thumb I use 0.095 m3 per Kw/h.
So a 30 kw boiler will use approx 3 m3 per hour.
One problem I have found in houses is undersized radiators which basically means to get warm the heating is on for ages.
A sensible equation is 5 btu per cubic foot.
3412 btu is 1 kw (1000watts) so calculate your room volume in feet
( length x width x height) by 5 and thatís how many btu you need in a space you occupy, lounge , dining, hallway etc.
Bedrooms are 4 x and kitchens bathroom are 3 x per cubic foot.
These areas are less because in bed you are covered and a bathroom is less time.
All radiators have an output, some are more efficient but cheap to dear will have an output.
You can measure your radiator in a space and look for that size on line.
Double, single, with fins without fins etc. familiarise yourself with the type and most plumbers merchants will have a brochure of some sort to see a picture.
You will be surprised how many rads are installed to fit a space on a wall rather than the actual space volume. Mine are over by about 15% and my heating is on for 15 minutes and Iím toasty hot. Then off for about half hour then on for 5 mins ad infinitum till bed time or Iím too hot. I havenít got a time clock as my room stat sits at
about 12* c at all times unless I turn it up. This stops my place cooling down too much so itís just a trim up when needed.
I have posted this before a while ago but now it might help a few holers bearing in mind itís totally relevant with the cost of energy. Anyhow sorry to bore you but check out my info and I can guarantee many of you have undersized radiators which will invariably cost you money. It may seem a false economy oversizing but itís defiantly nice to actually here your heating turning off occasionally.

Edited by cryrst (12 Oct 2022 9.16pm)

 

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View The groover's Profile The groover Flag Danbury 12 Oct 22 9.16pm Send a Private Message to The groover Add The groover as a friend

Edited by The groover (12 Oct 2022 9.19pm)

 

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View The groover's Profile The groover Flag Danbury 12 Oct 22 9.19pm Send a Private Message to The groover Add The groover as a friend

That seems excessive.

My estimate is 23K and I have a similar size house.

Do you have nest or hive?

 

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