Which Baxi boiler models are available in 2026
Baxi offers four main gas boiler ranges for homeowners in 2026: the 400, 600, 800, and 900 series, plus the Platinum combi and system models. The 400 series is the entry-level option with a 7-year warranty. The 900 series is the top-end condensing combi with a 10-year warranty. All current Baxi boilers are condensing models rated A or above on the ErP energy label (Baxi official product literature, 2026).
Baxi boilers cost £600–£1,500 for the unit in 2026, with seasonal efficiency of 89–92%. The 900 series offers a 10-year warranty and A+ rating, while the 600 series is best for three-bed homes. Compare models to find the right fit.
- Baxi offers four gas boiler series in 2026: 400, 600, 800, and 900.
- The 900 series comes with a 10-year warranty and A+ ErP rating.
- Baxi boilers achieve 89–92% seasonal efficiency, mid-range for UK models.
- Worcester Bosch and Vaillant cost £300–£500 more but reach 93–94% efficiency.
- The 600 series is the most popular choice for three-bedroom homes.
- Which Baxi boiler models are available in 2026
- Quick numbers
- How Baxi boiler efficiency compares with other brands in 2026
- What the Baxi warranty covers and how to claim
- How to verify a Baxi boiler installer
- What is the best Baxi boiler for a UK home in 2026?
- Eligibility for Baxi boiler grants and funding in 2026
Baxi also produces the Assure range for oil-fired homes, but this review focuses on gas models. Each series is designed for different home sizes and budgets. The 600 series is the most popular choice for three-bedroom homes. The 800 and 900 series include stainless-steel heat exchangers for improved durability.
Quick numbers
The table below summarises the key specifications for each Baxi gas boiler series available in 2026. All prices are for the boiler unit only and exclude installation.
| Model series | Price (£) | Warranty (years) | ErP rating | Flow rate (l/min) | Heat output (kW) |
|---|---|---|---|---|---|
| 400 | £600–£800 | 7 | A | 9–11 | 24–30 |
| 600 | £700–£900 | 7 | A | 10–12 | 24–35 |
| 800 | £900–£1,200 | 7 | A | 12–14 | 30–40 |
| 900 | £1,200–£1,500 | 10 | A+ | 13–15 | 30–40 |
| Platinum | Discontinued | N/A | N/A | N/A | N/A |
Warranty and ErP data are from the Baxi official website, 2026. Flow rates are from Baxi technical datasheets.
How Baxi boiler efficiency compares with other brands in 2026
Baxi boilers typically achieve a seasonal efficiency of 89–92% using the SAP 2012 method, which is mid-range for UK gas boilers (EST boiler efficiency database, 2026). Worcester Bosch and Vaillant models often reach 93–94% efficiency, but cost £300–£500 more for a comparable model.
The Baxi 900 series uses a stainless-steel heat exchanger to improve longevity, but does not significantly improve efficiency over the 800 series (Baxi product specification, 2026). For a typical three-bedroom home, the annual gas saving between a Baxi 800 and a premium brand is roughly £20–£30, based on Ofgem typical domestic consumption values for 2026.
Efficiency differences between brands are small for most homes. The larger factor is whether the boiler is correctly sized for your property. An oversized boiler will cycle on and off more often, reducing overall efficiency.
What the Baxi warranty covers and how to claim
Baxi offers a standard 7-year warranty on the 400, 600, and 800 series, and a 10-year warranty on the 900 series (Baxi warranty terms, 2026). The warranty covers parts and labour for the heat exchanger, burner, and controls. It does not cover external thermostat or flue components.
To claim, the boiler must be registered within 30 days of installation via Baxi’s online portal. Annual servicing by a Gas Safe registered engineer is required to keep the warranty valid. The warranty is non-transferable to a new homeowner unless Baxi’s “Lifetime Warranty” add-on is purchased at extra cost.
If you sell your home within the warranty period, the new owner will not be covered unless the add-on was bought. Check the warranty terms carefully before choosing a model. how to transfer a boiler warranty to a new owner
How to verify a Baxi boiler installer
All gas boiler installations in the UK must be carried out by a Gas Safe registered engineer. You can check the engineer’s ID card or search the Gas Safe Register website. For a Baxi boiler, the installer should also be Baxi-approved, listed on Baxi’s “Find an Installer” tool, to keep the full warranty valid.
TrustMark registration is optional but recommended, as it indicates the installer meets government-endorsed standards for consumer protection. MCS certification is not required for gas boilers. It applies only to renewable heating systems such as heat pumps or solar thermal.
Using an unregistered installer can void your warranty and may be unsafe. Always verify credentials before work begins.
What is the best Baxi boiler for a UK home in 2026?
For most three-bedroom homes, the Baxi 600 combi (24–28 kW) offers the best balance of price (£700–£900), efficiency (90%), and a 7-year warranty (Baxi 2026 price list). For larger homes with four or more bedrooms, the Baxi 800 combi (30–35 kW) provides a higher flow rate of 12–14 litres per minute and a stainless-steel heat exchanger.
The Baxi 900 series is only worth the premium (£1,200–£1,500) if you want a 10-year warranty and plan to stay in the home for more than 8 years. The Baxi Platinum range was discontinued in 2025 and is no longer sold new. Buyers should only consider it second-hand with a full service history.
The right model depends on your home size, hot water demand, and how long you expect to live in the property. how to choose the right boiler size for your home
Eligibility for Baxi boiler grants and funding in 2026
The Boiler Upgrade Scheme (BUS) does not cover gas boilers. It only applies to heat pumps and biomass (GOV.UK Boiler Upgrade Scheme page, 2026). The Energy Company Obligation (ECO4) scheme may part-fund a gas boiler replacement for low-income households or those on certain benefits (Ofgem ECO4 guidance, 2026).
No specific Baxi-brand grant exists. Eligibility depends on household income, property type, and existing heating system. Homeowners should check the government’s Simple Energy Advice site or contact their energy supplier for ECO4 eligibility before purchasing.
If you are on a low income or receive means-tested benefits, ECO4 may cover part or all of the cost of a new gas boiler. Apply before you buy, as retroactive funding is not available.
Frequently Asked Questions
The Baxi 600 series is the most popular choice for a three-bedroom home, with prices from £700 to £900 and a 7-year warranty. According to Baxi official product literature, it offers heat outputs of 24–35 kW and flow rates of 10–12 litres per minute.
Baxi boilers typically last 10–15 years with proper servicing. The 900 series includes a 10-year warranty, while the 400, 600, and 800 series come with a 7-year warranty, based on Baxi official website data for 2026.
Yes, Baxi boilers are considered reliable mid-range options in the UK, with seasonal efficiency of 89–92% according to the EST boiler efficiency database for 2026. The 800 and 900 series use stainless-steel heat exchangers for improved durability.
Installation costs for a Baxi boiler typically range from £1,500 to £2,500, including the boiler unit. The boiler unit alone costs £600–£1,500 depending on the series, as per Baxi official pricing for 2026.
Baxi boilers cost £300–£500 less than comparable Worcester Bosch models, but Worcester Bosch offers higher efficiency at 93–94% versus Baxi's 89–92%, according to the EST boiler efficiency database for 2026. Your choice depends on budget and efficiency priorities.
