On a £2,500 boiler with no deposit, 0% finance over 4 years costs £52.08 a month and nothing extra. At 9.9% APR over 10 years the payment falls to £32.32 a month, but you pay £3,878.40 in total: £1,378.40 more than paying upfront. Of the 7 installers we checked, 6 offer 0% finance on at least some boilers, and interest-bearing finance is advertised at 9.9% to 13.9% APR.
Work out your monthly payments
Your monthly payment
£32.32 a month for 10 years
120 monthly payments of £32.32 with no deposit. You would pay £3,878.40 in total, £1,378.40 more than paying £2,500 upfront.
| Boiler price | £2,500.00 |
|---|---|
| Deposit | £0.00 |
| Amount borrowed | £2,500.00 |
| Monthly payments | 120 × £32.32 |
| Cost of credit (interest) | £1,378.40 |
| Total you pay | £3,878.40 |
The same loan over other terms
| Term | Monthly | Interest | Total |
|---|---|---|---|
| 1 year | £219.18 | £130.16 | £2,630.16 |
| 2 years | £114.76 | £254.24 | £2,754.24 |
| 3 years | £80.06 | £382.16 | £2,882.16 |
| 4 years | £62.78 | £513.44 | £3,013.44 |
| 5 years | £52.48 | £648.80 | £3,148.80 |
| 7 years | £40.83 | £929.72 | £3,429.72 |
| 10 years | £32.32 | £1,378.40 | £3,878.40 |
Advertised APRs are representative: at least 51% of accepted applicants get that rate or lower. The rate you are offered depends on your credit history.
Monthly payments on a £2,500 boiler
No deposit. The smaller figure is the total you repay.
| Term | 0% APR | 9.9% APR | 10.9% APR | 13.9% APR |
|---|---|---|---|---|
| 1 year | £208.33 £2,500.00 total | £219.18 £2,630.16 total | £220.24 £2,642.88 total | £223.39 £2,680.68 total |
| 2 years | £104.17 £2,500.00 total | £114.76 £2,754.24 total | £115.81 £2,779.44 total | £118.96 £2,855.04 total |
| 3 years | £69.44 £2,500.00 total | £80.06 £2,882.16 total | £81.13 £2,920.68 total | £84.34 £3,036.24 total |
| 4 years | £52.08 £2,500.00 total | £62.78 £3,013.44 total | £63.88 £3,066.24 total | £67.18 £3,224.64 total |
| 5 years | Rarely offered | £52.48 £3,148.80 total | £53.60 £3,216.00 total | £56.99 £3,419.40 total |
| 7 years | Rarely offered | £40.83 £3,429.72 total | £42.01 £3,528.84 total | £45.60 £3,830.40 total |
| 10 years | Rarely offered | £32.32 £3,878.40 total | £33.58 £4,029.60 total | £37.45 £4,494.00 total |
0% deals on boilers usually run for 48 months at most, so longer 0% terms are marked "Rarely offered".
Boiler finance offers from UK installers
What each installer advertises on its own website, checked 30 September 2026. Offers change often and usually depend on the boiler you choose, so check the live terms before you apply.
| Installer | 0% finance | Interest-bearing APR | Longest term | Deposit | Lender |
|---|---|---|---|---|---|
| BOXT | 12 to 48 months, depending on the boiler | 9.9% (representative) | 120 months | £0 to 50% | HomeServe Finance; sometimes Propensio Finance |
| British Gas Minimum borrowing £1,000. Early repayment charges apply on the 9.9% plan only. | 2 or 3 years | 9.9% over 10 years | 120 months | £0 | Panel of lenders (not named) |
| Heatable Klarna also offered. | Up to 48 months on selected boilers | 9.9% in its finance guide; 11.9% on its new boilers page | 120 months | £0 to 50% | Panel of lenders (not named) |
| WarmZilla Borrow £1,000 to £25,000. | Up to 4 years on selected boilers | Up to 13.9% | 120 months | £0 to 40% | Novuna Personal Finance |
| iHeat | Yes (24-month example) | 9.9% | Not stated | 0%, 25% or 50% | V12 Retail Finance |
| Worcester Bosch installers Arranged through the installer, so offers differ between installers. | Through some installers; terms vary | 10.9% (representative) | 120 months | Varies by installer | Novuna Personal Finance |
| Hometree From £44.65 a month; payments rise each year by 3.99% or inflation, whichever is higher. | Monthly plan rather than a loan | Not stated | 3 to 12 years | £0 | Hometree Finance |
Installer names link to the page each figure comes from. EnergyGuide has not applied for these offers and cannot say what rate you would be offered.
How the calculator works
The amount borrowed is the boiler price minus your deposit. UK APRs are annual rates that already include compounding, so the monthly rate is worked out from the APR rather than by dividing it by 12. The payment is the fixed amount that clears the loan, with interest, over the term you choose, rounded to the penny.
Monthly rate = (1 + APR)^(1/12) − 1. Monthly payment = amount borrowed × monthly rate ÷ (1 − (1 + monthly rate)^−months).
At 0% the payment is simply the amount borrowed divided by the number of months. Lenders sometimes adjust the first or last payment by a few pence so the total comes out exactly.
Boiler finance: common questions
How does boiler finance work?
The installer acts as a credit broker and introduces you to a lender. You choose a boiler, pay any deposit, and borrow the rest as a fixed-rate loan repaid monthly. The lender runs a credit check before approving you. You then have 14 days to withdraw from the credit agreement.
Is 0% boiler finance really free?
Yes, if you make every payment on time: you repay the cash price and nothing more. The catch is usually elsewhere. 0% is often limited to selected boilers or to terms of 4 years or less, and a higher boiler price can cost more than the interest you avoid. Compare the cash price with other installers before choosing a 0% deal.
What does "representative APR" mean?
It is the rate at least 51% of accepted applicants will get. The rest may be offered a higher rate, or a smaller loan, depending on their credit history. Use this calculator with a few different APRs to see how much the rate matters.
Can I pay off boiler finance early?
Yes. You have a legal right to repay a consumer credit agreement early, and you stop paying interest on what you repay. The lender can charge compensation of up to 1% of the amount repaid early if more than a year is left, or 0.5% if less. Many 0% plans charge nothing.
Does applying for boiler finance affect my credit score?
A full application usually leaves a hard search on your credit file, which other lenders can see. Some installers run a soft eligibility check first, which does not. Avoid several full applications in a short time, and remember that missed payments will harm your credit record.
Can I get boiler finance with bad credit?
Sometimes. Installers that work with a panel of lenders can pass a declined application to a second lender, but expect a higher APR or a smaller loan. If you receive certain benefits, check whether you qualify for a free or subsidised boiler through the ECO4 scheme before borrowing.
Is a monthly boiler plan the same as finance?
Not quite. Some companies rent or supply the boiler on a monthly plan that also covers servicing and repairs, and the payment often rises every year. For example, £45 a month rising by 3.99% a year adds up to about £6,480 over 10 years, compared with £5,400 if it stayed flat. Compare the total over the full term with a loan plus separate boiler cover.
How accurate is this calculator?
It uses the standard way UK lenders turn an APR into monthly payments. Worcester Bosch's published example, £2,100 borrowed over 120 months at 10.9% APR, comes out here at £28.21 a month, the same as the lender's figure. Your actual payments can differ by a few pence depending on when the first payment is due.
EnergyGuide does not lend money or arrange finance. Figures are illustrations, not offers: lenders set your rate after a credit check. Some links on this page may earn EnergyGuide a commission. Read our affiliate disclosure.