Is This Correct???

Astria

razord said:

nursemolly said:

MWT said:

No, modern boilers modulate the burn to reduce their consumption to what is needed, close to impossible for your boiler to operate at full power all the time as you cannot distribute the heat that fast...

Thanks..any idea what the average per hour might be for 3 bed semi....just trying to work out rough averages

Afraid you'll need to test this yourself. Take a read, turn the heating on for an hour, and take another read.

You might need to run for more than a single hour to get an actual meaningful value though, unless your meter has decimal places.

You probably need to run it for several hours anyway as the first time is typically the most expensive. Subsequent hours to just maintain a temperature (assuming a thermostat is fitted in a suitable place) will likely use far less fuel.

When I moved into our current house the thermostat was in the hallway, which is a bit of a daft place for it to go because the hallway is the least used and don't particularly care about the temperature of it. So it's now in the lounge* and the hallway radiator is now set at a 15c temperature via a TRV which it couldn't have before.

(* after arguments about "the people who put it there "must have known what they were doing" and I could be messing with experts and ruining the system, blah blah)

nursemolly

So my gas reading in Feb 22 was 18320 and in Nov 21was 17690 which is 630..so is this approx 630 khw?? sorry if sound a little dumb
TIA

[Deleted User]

nursemolly said:

So my gas reading in Feb 22 was 18320 and in Nov 21was 17690 which is 630..so is this approx 630 khw?? sorry if sound a little dumb
TIA

Sadly not. Gas meters record the volume of gas used. The supplier will convert the volume into kWh based on the calorific value of the gas supplied and the meter type. Old meters record volume in cubic feet: newer meters in cubic metres.

If your meter is M3, then multiply your 630 by 11.3 to give approximate kWh value.

BUFF

No, electricity meter reading usage=kWh. Nice & simple.
Gas meter readings require some calculations to work out kWh used. Do you know if your meter reads in cubic feet or cubic  metres?

Miser1964

>Which is where a lot of waste comes in as the minimum level the boiler can modulate down to is usually related to the maximum rating<

Like the OP, I have a Worcester Greenstar rated at 30kW. When last serviced, I asked the gas fitter to optimise the settings; these come from the factory set to 'maximum'  :'( 

We agreed to set -

Max Heating Output to 50%
Set the pump to step adjustable so it modulates with the fan, linked to -
Set pump step map to 4, which matched head/volume required for house
Max flow temp set on front dial, ensuring return was low enough to condense.

nursemolly

Yes it is ..now gives me 6930 x 10.1 = 69993..divided by 3 months = 23331 ..divided by 30 days = 777.7. per day ...divided by 24 hours = 32.4....  oh heck...maths not my strong point....but 32.4p per hour  sounds a bit too cheap....lol

nursemolly

Many thanks for everyones help...didnt realise it was so confusing

molerat

Is your heating on 24 hours a day ?

I would just stop at the day rate.

Just under £8 per day looks reasonable for the winter months (although just over £2 last year !!)

nursemolly

molerat said:

Is your heating on 24 hours a day ?

I would just stop at the day rate.

Just under £8 per day looks reasonable for the winter months (although just over £2 last year !!)

Just generally usually on for 2 hours in the morning and approx 3 hours in the evening from Nov - Feb..so not heavy usage...with the odd boost as needed 

molerat

nursemolly said:

molerat said:

Is your heating on 24 hours a day ?

I would just stop at the day rate.

Just under £8 per day looks reasonable for the winter months (although just over £2 last year !!)

Just generally usually on for 2 hours in the morning and approx 3 hours in the evening from Nov - Feb..so not heavy usage...with the odd boost as needed 

So if you are only heating for 5 hours per day then it is costing you around £1.50 per hour to run the boiler.  That is the problem with trying to figure out an hourly cost as the boiler costs different amounts per hour depending on what it is doing.  Keep it on for longer and it will cost less per hour but will cost more overall.