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01 · Ask
Repair, replace or upgrade?
Cold rads, no hot water, F22 fault code? Describe what's happening — the AI tells you if it's a £150 repair or a £3k replacement.
Choose a Baxi boiler.
Baxi 600, 800, EcoBlue — which model suits your house and what installers actually charge to fit it.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Hire a boiler engineer. Without the warranty void.
Read the brief on sizing, brands and warranty rules — then let Three local engineers quote on the right boiler for your house.
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02 · Read the brief
Walk in informed
kW sizing, modulation ratios, Benchmark cert, manufacturer warranty terms. Know what to ask before they recommend the most expensive box on the van.
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03 · Compare
Compare 3 engineer quotes
Three local engineers come back with itemised quotes — boiler, flue, controls, power-flush, commissioning — so the like-for-like vs upgrade choice is yours.
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Top tips
Hiring a boiler engineer, without the regret.
Four moves that separate a smooth job from a nightmare.
Get a Gas Safe ID before letting them in.
Boilers are gas appliances. Anyone working on yours must be Gas Safe registered — and on the right scheme for your fuel (LPG, oil, natural gas are separate).
Demand the Benchmark certificate.
Every new boiler comes with a Benchmark commissioning checklist. Without it, the manufacturer warranty is void — and the certificate goes in your seller's pack later.
Size the boiler to the radiators, not the house.
Oversized combis short-cycle, wear out fast and cost more to run. A heat-loss calc — not a 'same as before' swap — is the sign of a careful installer.
Power-flush before fitting.
On a 10-year-old system, sludge will write off your new boiler's heat exchanger in 18 months. A power-flush should be quoted; if it's not, ask why.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Boiler service (annual)
£80–£150
Combi boiler swap (like-for-like)
£1.8k–£3k
Combi boiler upgrade (premium)Vaillant/Viessmann tier
£2.8k–£4.5k
System boiler + cylinder
£3k–£5.5k
Power flush
£450–£900
Conversion from back-boilerInc. removal + replumb
£3.5k–£6k
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Baxi — based in Preston — competes directly with Ideal at the budget end of the UK market. The 600 series is one of the cheapest mainstream boilers available. This guide covers Baxi range in 2026.
Baxi Range
- 600 Combi — entry-level budget.
- 800 Combi — mid-range.
- Platinum Combi — premium tier.
- EcoBlue — system options.
- Megaflo — Baxi premium brand (Heatrae Sadia).
Typical Costs
| Model | Supply £ | Installed £ | Notes |
|---|---|---|---|
| 600 Combi 24kW | 700 | 1,800 | Budget |
| 800 Combi 30kW | 1,000 | 2,200 | Mid-range |
| Platinum Combi | 1,400 | 2,700 | Premium |
Warranty
- 600: 7-year.
- 800: 8-year.
- Platinum: 10-year.
UK Regulations
- Gas Safe + Building Control standard.
Common Problems
- E10 fault — flow sensor.
- E125 fault — pressure.
- E133 fault — flame failure.
Frequently Asked Questions
Are Baxi boilers good value?
Yes for budget builds. 600 is competitively priced; 800 + Platinum compete with Ideal Vogue.
How long do they last?
10-15 years for 600; longer for 800/Platinum.
Baxi vs Ideal?
Similar price/quality bracket. Baxi has slightly longer warranty on 800; Ideal Logic feels slightly more refined.
Hydrogen-ready Baxi?
Yes — Baxi 600 H2 model launched 2024.
Are they reliable?
Good for the price. Mid-range Baxi 800 is well-reviewed; budget 600 cuts some corners.
Megaflo cylinders?
Baxi-owned brand — top UK unvented cylinder for system boilers. Worth specifying.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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