How much does gas central heating cost to run per hour?

Alnat1

As you have a tank, how long is this heated for each day and to what temperature? What do you use the hot water for?

If you're looking to reduce the amount of gas you use, water heating might be another place you can make savings.

scotsmantom

Water heating for a couple of hours a day approx I think to about 60 C for showers.

[Deleted User]

Mstty said:

Best finger in the air is 16000 kWh a year in gas, let me know in a year how close I was👍

Sounds about right I have a 4 bed detached house with a non combi gas boiler, 12 radiators and a gas fire. In the past 12 months I used 15,269 kWh. That is just on heating and hot water as my cooker and hob are electric.

[Deleted User]

Deleted_User said:

Mstty said:

Best finger in the air is 16000 kWh a year in gas, let me know in a year how close I was👍

Sounds about right I have a 4 bed detached house with a non combi gas boiler, 12 radiators and a gas fire. In the past 12 months I used 15,269 kWh. That is just on heating and hot water as my cooker and hob are electric.

Going by what I am using in the summer about 5,000 kWh a year is going on hot water and the pilot light. So just over 10,000 kWh on heating.

My home as far as I know has no cavity wall insulation and only has 75mm of loft insulation. It is stone rather than brick finish and the ground floor is concrete rather than floorboards, so probably slower to heat up and cool down than a brick house with floorboards for the ground floor.

[Deleted User]

Deleted_User said:

Deleted_User said:

Mstty said:

Best finger in the air is 16000 kWh a year in gas, let me know in a year how close I was👍

Sounds about right I have a 4 bed detached house with a non combi gas boiler, 12 radiators and a gas fire. In the past 12 months I used 15,269 kWh. That is just on heating and hot water as my cooker and hob are electric.

Going by what I am using in the summer about 5,000 kWh a year is going on hot water and the pilot light. So just over 10,000 kWh on heating.

My home as far as I know has no cavity wall insulation and only has 75mm of loft insulation. It is stone rather than brick finish and the ground floor is concrete rather than floorboards, so probably slower to heat up and cool down than a brick house with floorboards for the ground floor.

Oh and people are in all day.

chris1973

A boiler with a 24kw input will use 24 kwh of gas before it starts modulating its output.

In other words, expect your boiler to use its rated Gas input until the radiators are upto to the water temperature specified on the output control.

After that, the boiler will modulate (vary) its output and gas consumption based on its current water flow temperature.

So, at the minimum, expect a 24kw boiler to gobble up 24 kw/h worth of gas every hour until the radiators  reach their operating temperature.

24kw of gas is 24x 10p so £2.40 per hour just to heat your radiators.

Beyond that, its all down to the rating of the boiler, the efficiency of the boiler, and the heat loss from the fabric of the building. No two properties are the same. That is why everybody pays a different amount for their heating..........

Coffeekup

As others have said it's a complicated question. The insulation of the home, the desired thermostat temperature, current home temperature when it kicks in, the boiler size, the boiler efficiency, if anyone manually turns the heating on and other factors come into play.

Worst case scenario is ....
A 21kwh boiler is running for a while hour trying to get the home up to temperature for one hour non stop would mean it uses 21kwh's during that hour. So using October's price cap of around 10.3 pence it would cost £2.16 an hour, if your home never got up to the desired temperature and it was on 8 hour's a day constantly it would cost £17.30 a day.

Without knowing which boiler you have, a rough guess by the size of your home and the number or radiator's you have, the boiler could be a 30kwh boiler costing at its worst £3.10 an hour.

If you had good insulation in the home, and the home was already at 18*C and you desired 20*C they boiler may only run for a few minutes an hour costing far less to run per hour/day/month.

Boilers range from 9kwh's to 40kwh's.
If a well know energy supplier fitted it, there is a good chance they quoted you and fitted you an oversized one, which they did to 2 people I know and pushed me for once I had a quote. Why would they do this? Well they sell gas, but that's a whole other story.

scotsmantom

Just checked our boiler Ideal Logic Heat H15 is just a 15 kw boiler so much smaller output than most are assuming. Must be because these new houses have a B. EPC rating. Thanks to all  who encouraged me to find out.

[Deleted User]

chris1973 said:

A boiler with a 24kw input will use 24 kwh of gas before it starts modulating its output.

I have a 24kW boiler. If you look at the graph on page 1 of this thread you might be surprised to see that the boiler doesn’t run at a constant 24kW in the heating phase. The graph shows total usage from 7 am to 8 am of just over 10.5kWh.

[Deleted User]

Deleted_User said:

Mstty said:

Best finger in the air is 16000 kWh a year in gas, let me know in a year how close I was👍

Sounds about right I have a 4 bed detached house with a non combi gas boiler, 12 radiators and a gas fire. In the past 12 months I used 15,269 kWh. That is just on heating and hot water as my cooker and hob are electric.

Comparisons are meaningless. I have a 4 bedroomed home with  a 24kW gas boiler; 18 radiators and a gas hob. Our total gas usage last year was 7771kWh.