Best Boiler Finance Deals UK 2026: Ranked Comparison
There’s no single “best” boiler finance deal in the UK. The right deal depends on which specific combination of APR, term, deposit and credit tier fits your circumstances. The two quotes we recommend first are Heatable (0% APR up to 48 months, and the widest credit acceptance) and iHeat (0% APR over 24 months, wider brand range, Which? Trusted Trader). The same pair tops our best boiler installers UK ranking. E.On Next still wins on the cheapest long-term interest-bearing rate. The winner for a first-time buyer with good credit is rarely the same as the winner for someone with a recent CCJ.
Side-by-side on price, brands and speed: Heatable vs iHeat. For who we rank overall, see best boiler installers UK.
This guide ranks the major UK boiler finance deals by specific criteria rather than a single league table, so you can find the winner for your actual situation.
What “best” actually means in boiler finance
Six factors determine whether a finance offer is actually competitive. The best deal for you is the one that wins on the factors most relevant to your situation.
- Headline APR you’ll actually qualify for. Not the advertised rate: the rate after soft-search assessment.
- Maximum 0% APR term. Among the installers we recommend, that is 48 months with Heatable and 24 months with iHeat.
- Deposit requirements. £0 versus 20% to 25% can be decisive.
- Credit acceptance breadth. Some lenders decline profiles that others approve at the same APR.
- Installation speed. Fixed-price installers fit next-day; traditional installers need a survey first.
- Early settlement flexibility. All FCA-regulated agreements allow it, but some partners make it easier than others.
Best overall 0% APR deal: Heatable, 48-month term
If you qualify for 0% APR, the deal we recommend first is Heatable. Our Heatable review walks through the 48-month 0% term and the multi-lender panel. Their interest-free window runs 12 to 48 months on selected boilers, with £0 deposit available on qualifying profiles, a multi-lender panel, and a fixed online price. That is the longest 0% term among the installers we actually send people to. Soft-search is available before a hard credit check.
Some installers have advertised a 60-month 0% window (BOXT has). Their current public finance page lists 0% from 12 to 48 months, so treat that longer term as a market comparison, not a live path. Quote Heatable’s 48-month 0% and iHeat’s 24-month 0% and take the better number for your home.
Best for long-term finance: E.On Next, 10-year plan
If the short-term monthly on a 0% plan would stretch your budget and you need a longer repayment window, E.On Next’s interest-bearing plan undercuts most competitors. At roughly 8% APR, the total cost on a 10-year term is meaningfully lower than the 10.9 to 11.9% offered elsewhere.
Best for broad credit acceptance: still Heatable
The same Heatable quote that wins on 48-month 0% is also the one to try if your credit is fair or imperfect. They work with multiple finance partners, including both prime and subprime lenders, so applications declined elsewhere often find an approval here. That breadth is the real difference, not a longer advertised 0% window.
Best for brand range and a fast quote: iHeat
iHeat is the other installer we recommend quoting. It holds Which? Trusted Trader accreditation, quotes in about 60 seconds, and fits a wider brand list than most online platforms: Worcester Bosch, Vaillant, Ideal, Viessmann, Alpha and Glow-worm. 0% APR is available on selected boilers over 24 months. That is a shorter interest-free window than Heatable, so if a long 0% term is your priority, start with Heatable. If you want Viessmann or Alpha, or you need a boiler tomorrow, start with iHeat.
Best for complex installations: British Gas
British Gas is rarely the cheapest option on price or the most flexible on finance terms. Where it wins is on handling unusual installations (older properties, system conversions, boiler relocations) where a fixed-price online quote doesn’t capture the real complexity.
Warmzilla: shorter 0% window
Warmzilla’s 0% APR is capped at 24 months, shorter than Heatable. On 3-year plus terms, the 10.9% APR applies. For a short-term 0% plan with £0 deposit, Warmzilla is competitive; for anything longer, Heatable (0% to 48 months) or E.On Next (cheaper long-term interest) have better offerings.
Which deal wins for your situation
| Your situation | Best deal | Why |
|---|---|---|
| Good credit, want lowest monthly without interest | Heatable 48-month 0% | Longest 0% term among the installers we recommend |
| Good credit, want fastest repayment | Heatable or iHeat 24-month 0% | Clear the balance quickly with no interest |
| Want Viessmann, Alpha or Glow-worm | iHeat | Wider brand range than most online installers |
| Need 10-year repayment, good credit | E.On Next | Roughly 3 points lower APR than competitors |
| Fair credit, standard installation | Heatable | Multi-lender approach improves approval chances |
| Unusual property or complex install | British Gas | Surveyed quote captures real complexity |
| Poor credit, subprime territory | Heatable or credit union | Multi-lender may approve when others won’t; credit union sometimes cheaper |
| Qualify for benefits | ECO4 grant | A free boiler always beats any finance deal |
Soft-search Heatable and iHeat before committing. The actual APR you’re offered almost always tells a different story than the advertised rate.
For a deeper look at how each APR tier affects total cost, see our main boiler finance guide. For specific 0% APR deals and qualifying requirements, our 0% boiler finance guide covers the current market.
Frequently asked questions
There isn’t a single best deal. The two we recommend quoting are Heatable (0% APR up to 48 months, widest credit acceptance) and iHeat (0% APR over 24 months, wider brand range). E.On Next has the lowest rate we have seen on interest-bearing long-term plans. The best deal for you depends on your credit tier and preferred term length.
Usually yes on headline monthly cost for a straightforward swap, especially if you qualify for 0% APR. Heatable’s 48-month 0% window matches British Gas’s typical 0% ceiling without a survey-first quote, and iHeat’s 24-month 0% is the short-term alternative. British Gas catches up on complex installations where a surveyed quote identifies costs a fixed-price online tool might miss.
Yes, on terms of 12 to 48 months, subject to credit approval. A deposit is not required on selected options, though paying one (Heatable allows up to 50%) reduces the monthly. Longer interest-bearing terms run up to 10 years; published rates vary, so use the figure in your own quote rather than a headline.
No. The advertised APR is the “representative example”: under FCA rules, this rate must be offered to at least 51% of approved applicants. The remaining 49% can be offered higher APRs based on individual credit profile. A soft search tells you what you’ll actually be offered before any hard credit check.
Heatable, iHeat, British Gas, Warmzilla, and E.On Next all offer £0 deposit options on qualifying applications. Approval for £0 deposit typically requires a reasonable credit score. Applicants in the “fair” credit tier and below are sometimes required to put down a deposit to access the best APR.
APR tiers and maximum terms are typically stable over 3 to 6 month periods. Promotional 0% windows come and go more frequently. Always confirm current terms directly with the installer before applying. Our summary reflects our understanding at time of writing.
HomeBoiler provides independent information to help UK homeowners understand their heating and finance options. We are not a qualified installer, a regulated financial adviser, or an agent of any installer or lender mentioned in this article. Rankings are based on our evaluation of publicly advertised deal terms; individual offers depend on credit profile. Always confirm current terms directly with the installer before committing.