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. BOXT wins on longest 0% term; E.On Next wins on lowest long-term interest rate; Heatable wins on widest credit acceptance. The winner for a first-time buyer with good credit is rarely the same as the winner for someone with a recent CCJ.
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 genuinely 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. Ranges from 24 months (Warmzilla) to 60 months (BOXT).
- 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 — BOXT, 60-month term
If you qualify for 0% APR and can comfortably afford £42 a month for 5 years, BOXT’s 60-month interest-free plan is currently the strongest headline deal in the UK boiler market. Nothing else combines the length of the term, £0 deposit, and a fixed online price the same way.
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 — Heatable
Heatable works with multiple finance partners including both prime and subprime lenders, which means applications that are declined elsewhere often find an approval here. Their 0% APR offers are competitive but not class-leading; their value is in the range of profiles they can finance.
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.
Honest mention — Warmzilla, shorter 0% window
Warmzilla’s 0% APR is capped at 24 months, shorter than competitors. 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, BOXT or E.On Next have better offerings.
Which deal wins for your situation
| Your situation | Best deal | Why |
|---|---|---|
| Good credit, want lowest monthly without interest | BOXT 60-month 0% | Longest 0% term in the UK market |
| Good credit, want fastest repayment | BOXT or Heatable 24-month 0% | Clear the balance quickly with no interest |
| 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 |
The right approach is to soft-search two or three installers 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 — different installers win on different criteria. BOXT currently offers the longest 0% APR term (60 months). E.On Next has the lowest rate on interest-bearing long-term plans. Heatable accepts the widest range of credit profiles. The best deal for you depends on your credit tier and preferred term length.
Usually yes on headline monthly cost, especially for 0% APR applicants. BOXT’s 60-month 0% option undercuts British Gas’s 48-month ceiling, and BOXT’s fixed online pricing is typically more competitive than British Gas’s surveyed quotes. British Gas catches up on complex installations where the surveyed approach identifies costs BOXT might miss.
Yes, on terms of 12 to 48 months, subject to credit approval. Heatable typically recommends a 25% deposit to access the best 0% APR tier. Applicants approved at lower APR tiers pay 11.9% on longer interest-bearing terms.
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.
BOXT, Heatable, 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 (for example, running 60-month 0% as a limited offer) come and go more frequently. Always confirm current terms directly with the installer before applying — our summary reflects our understanding at time of writing.