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Baxi 400 Boiler – Review

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Witten by Bernard Morgan (Engineer) & Adam Apperley (Marketing).
Published: June 21, 2021. Updated: January 23, 2024

Boiler only price: from £1,041

(Heat-only 15kW boiler-only price: comparing up to five suppliers, including Screwfix and Plumbase, where possible. Correct January 2024).

The Baxi 400 boiler range includes the Combi 2 and Heat versions. The combi boiler version is also available for LPG.

The 400 Combi 2 is a compact boiler with a 5-year warranty. The 400 Heat also comes with a 5-year warranty.

We’ve reviewed the 400 range to help decide if it’s right for you.

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About

The Baxi 400 range is quiet and compact boilers. All models in the range will fit into a standard kitchen cupboard. This makes it ideal for those with limited space but who are looking to install an effective boiler that can heat their home.

The Baxi 400 Heat weighs 17.4kg, is one of the lightest boilers currently available.

Baxi 400 Combi 2 boilers are available for natural gas and LPG in 24kW and 30kW power outputs. They can be controlled with normal or smart thermostats from a phone.

Models in the Baxi 400 range

  • Combi boilers
    • Baxi 424 Combi 2 – 24kW
    • Baxi 430 Combi 2 – 30kW
  • Heat-only/regular boilers
    • Baxi 415 Heat – 15kW
    • Baxi 418 Heat – 18kW
    • Baxi 424 Heat – 24kW

Key features

  • The Baxi 400 range is available in Combi, Combi LPG and heat-only models.
  • 5-year parts and labour warranty.
  • Simple to use LCD manual control panel.
  • Holds an ‘A’ energy efficiency rating, but with an 89% efficiency rating there are other more efficient boilers available.
  • Provides adequate heating and hot water for an average-size home.
  • The Baxi 400 Heat is compatible with the Megaflo eco-cylinder.
  • Quiet running.
  • The 400 Combi 2 boilers have stainless steel heat exchangers.
  • The 400 Heat boilers have aluminium heat exchangers.

Technical specification

Manufacturer Baxi 
Model 400 Combi 2, 400 Combi 2 LPG and 400 Heat
Condensing Yes
Efficiency Rating 89%
Energy Efficiency Class A-Rated
LPG Compatible Yes – LPG specific version
Warranty 5-year warranty
Combi Power Outputs Available 24 & 30kW
Hot Water Flow Rates 9.8 & 11.9 litres/minute
Regular/Heat-only Power Outputs Available 15kW, 18kW & 24kW
Mounting Wall Mounted
Weight 17.4 kg (Heat) or 28 kg (Combi 2 and LPG)
Dimensions 400 Heat: 625 mm (Height) x 370 (Width) x 270 mm (Depth)
400 Combi 2/400 Combi 2 LPG: 700 mm (Height) x 395 (Width) x 285 mm (Depth)
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Our thoughts

The Baxi 400 boiler range is a mid-tier and a relatively new addition to the UK boiler market. It is a lightweight and affordable boiler option. But, some customers may be put off by the number of plastic components it contains.

It is easy to install and service. It’s available in many heating outputs to accommodate most homes and features an in-built frost thermostat. The 400 range also has many flue lengths for different installation requirements.

“…not the best, not the worst, good middle of the road boiler”

It’s not the best or the worst boiler available. Baxi are known to make good boilers and this is their mid-range product with a middling 5-year warranty period.

A trusted brand

Baxi is an international company with headquarters in The Netherlands. They have been synonymous with reliable British-manufactured boilers since 1866. They are particularly popular with landlords looking for a reliable, easy-to-install and quiet boiler.

Energy-efficient so you reduce your bills

The Baxi 400 range has an ErP ‘A’ rating and an energy efficiency running performance of 89%. There are more efficient boilers available than the Baxi 400 range. To ensure this efficiency, like all boilers, room thermostats are required.

Even better, smart thermostats can be controlled from your phone. By controlling the boiler from your smartphone you can ensure your heating is managed. And you can take advantage of extra features. These include temperature scheduling, the ability to input holiday periods, and anti-frost protection.

Wide availability of parts 

Because they are manufactured in the UK, parts for the Baxi 400 are widely available at plants in Preston and Norwich. If you need a replacement item you can find spare parts at Screwfix, Plumbase and other plumbing merchants both in-store and online.

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