Heating savings calculator (UK)

Your home

Yearly gas use (kWh)
Ofgem's typical medium value is 9,500 kWh. Your bill or app shows your own figure.Gas unit rate (pence per kWh)
Ofgem price cap, GB average Direct Debit, 1 October to 31 December 2026.Share of gas used for space heating (%)
COMANORA assumption — the rest is hot water and cooking. Lower it if you heat water electrically or cook with gas a lot.Expected reduction in heating gas (%)
10% — see the scenarios below. Your result depends on how you heat your home today.

Optional: a product

Product
Or enter a cost (£)
Subscription per year (£)
Only if you plan to pay for one.

How the estimate works

Gas heating cost now = yearly gas use × share used for heating × unit rate.
Saving = gas heating cost now × expected reduction.
Net saving = saving − any subscription you choose to pay.
Payback = product cost ÷ net saving.

About manufacturer savings claims

Some manufacturers publish headline savings figures based on their own data or modelling. We show them on product pages, clearly marked as claims, but this calculator does not use them: it uses the reduction you choose.

Sources

Ofgem — Energy price cap unit rates and standing charges (GB average, Direct Debit) — accessed 5 November 2026
Energy UK — Typical Domestic Consumption Values explained (medium gas TDCV from 1 July 2026) — accessed 5 November 2026