How much does gas central heating cost per month in 2026?

For a typical 3-bed semi using 12,000 kWh of gas a year, expect £65 to £75/month at the Q2 2026 cap, plus £9/month standing charges. Bills peak at £130 to £150 in January and £15 to £20 in July.

Is gas still cheaper than electricity in 2026?

Per kWh, gas is roughly 4 times cheaper than electricity (5.74p vs 24.5p). But a heat pump's coefficient of performance of 3 to 4 means each electricity kWh becomes 3 to 4 kWh of heat, narrowing the gap.

Why is my gas bill higher than the average?

The biggest factor is insulation: a poorly insulated semi can use 17,000-19,000 kWh vs 10,000-12,000 for a well-insulated one. Also matters: thermostat above 21°C, hot water above 65°C, high shower flow, old boiler below 80% efficiency.

Does a new boiler reduce gas bills?

Replacing a 60% efficient old boiler with a 92% A-rated unit saves roughly £300 to £400/yr on a 3-bed semi. Replacing a recent 80%+ unit saves £80 to £150. Payback is 5 to 8 years if old unit is band F or G.

Q2 2026 cap / 8 min read

Running costs / Page 03

Gas boiler running costs 2026. What you will actually pay.

The average UK home spends £750 to £950 per year on gas heating and hot water. Here is what your home costs at the Q2 2026 Ofgem cap, with the maths laid out and the seasonal pattern shown.

Gas unit ratep/kWh

5.7p/kWh

Standing chargep/day × 100

2.9p/day × 100

Average system pressurebar

3.0bar

Annual cost by property size

All values use the Q2 2026 cap: 5.74p/kWh gas, 29.09p/day standing charge (£106.18 a year).

Property	Annual gas (kWh)	Heating cost	Per month avg	With standing charge
1-bed flat	6,500	£480	£40	£586
2-bed flat or terrace	8,500	£615	£51	£721
3-bed semi	12,000	£785	£65	£891
4-bed detached	17,000	£1,050	£87	£1,156
5+ bed detached	23,000	£1,380	£115	£1,486

How the calculation works

Formula

annual_cost = (kWh × 0.0574) + (0.2909 × 365)

kWh is your annual gas consumption from your bill or smart meter. The first term is fuel. The second is the daily standing charge multiplied by the days in the year.

Worked example: 3-bed semi

12,000 × 0.0574 = £688.80

0.2909 × 365 = £106.18

Total: £794.98 a year

Bills sit between £700 and £870 depending on usage pattern.

Seasonal breakdown

Roughly 60% of UK gas consumption falls in December, January and February. Summer use drops to hot water only.

Jan17%

Feb15%

Mar11%

Apr7%

May4%

Jun2%

Jul2%

Aug2%

Sep4%

Oct9%

Nov13%

Dec14%

Share of annual gas consumption by month, rounded to whole percentages. Source: Ofgem typical domestic gas profile, weighted to UK climate normals 2026.

Boiler efficiency impact

Same 3-bed semi, same 12,000 kWh of demand at the meter, very different bills. Efficiency is the single biggest lever after thermostat behaviour.

Boiler age	Typical efficiency	Annual cost (3-bed)	Action
20+ years (band G)	60%	£1,180	Replace now
15-20 years (band F)	68%	£1,050	Replace soon
10-15 years (band E)	78%	£910	Plan replacement
5-10 years (band C)	86%	£820	Service annually
0-5 years (band A)	92%	£770	Optimised

Boiler efficiency ladder

ErP / SAP bands

A
92%+ efficient: best of breed
B
89 to 91%: most modern condensing
C
84 to 88%: older condensing
D
78 to 83%: early condensing
E
72 to 77%: pre-2005 non-condensing
F
65 to 71%: old back boiler era
G
Under 65%: wasting money daily

Every new gas boiler sold in the UK since 2005 must be condensing and at least band A. Older homes often still run band D, E or worse: the ladder above shows what each step costs you.

Gas vs electricity (per unit, 2026)

Gas (mains)

5.74p

Per kWh, Q2 2026 cap

Electricity (heat pump-friendly tariff)

22.0p

Per kWh, off-peak heat-pump tariffs

Electricity (standard)

24.5p

Per kWh, Q2 2026 standard cap

Direct electric heating is roughly four times more expensive per useful kWh than gas. A heat pump narrows that gap because it delivers 3 to 4 kWh of heat per kWh of electricity drawn. See the full TCO on the gas vs heat pump page.

Price cap history

Period	Gas unit rate	Context
Q1 2022	4.10p	Pre-energy-crisis baseline
Q4 2022	10.30p	Energy Price Guarantee era
Q4 2023	7.51p	Cap recalibration
Q4 2024	6.34p	Wholesale prices easing
Q4 2025	6.07p	Settling toward new normal
Q2 2026	5.74p	Current cap, used on this page

The Ofgem cap is reset every three months. Source: Ofgem default tariff cap announcements.

Costs that are not in the running-cost line

Annual service: £80 to £120. Servicing page
Boiler cover: £10 to £25 a month if you take it instead of pay-per-service
Repairs and parts: £150 to £400 typical callout if cover is not in place
Carbon offset (voluntary): £30 to £80 a year, optional

FAQ

How much does gas central heating cost per month in 2026?
For a typical 3-bed semi using 12,000 kWh of gas a year at the Q2 2026 cap, expect £65 to £75 a month for heating and hot water, plus another £9 a month in standing charges. Bills peak at £130 to £150 in January and drop to £15 to £20 in July when only hot water draws gas.
Is gas still cheaper than electricity in 2026?
Per kWh, yes, by roughly 4 to 1. Gas at 5.74p versus electricity at 24.5p. But a heat pump runs at a coefficient of performance of 3 to 4, so each kWh of electricity becomes 3 to 4 kWh of heat. That narrows the gap considerably. See the full comparison on the gas vs heat pump page.
Why is my gas bill higher than the average?
The biggest single factor is insulation. A poorly insulated 3-bed semi can use 17,000 to 19,000 kWh, where a well-insulated one uses 10,000 to 12,000 kWh. Other drivers: thermostat set higher than 21°C, hot water tank set above 65°C, very high shower flow, and an old boiler running below 80% efficiency.
Does a new boiler reduce gas bills?
Replacing a 60% efficient old boiler with a 92% A-rated condensing model cuts gas use by roughly a third, around £300 to £400 a year on a 3-bed semi. Replacing a more recent 80%+ unit saves much less, typically £80 to £150. Boiler replacement pays back in 5 to 8 years from energy savings alone if the old unit is band F or G, longer if it is band C or D.