Save up to £590 PER YEAR on your heating billsGet Your FREE Online Quote TodaySave up to £590 PER YEAR a yearNeed a New Boiler?
Last Updated on November 21, 2023

Baxi 400 Boiler Review

The Baxi 400 Boiler is a highly functional Baxi boiler range, with three power output versions available – the 400 Combi, 400 Combi LPG and 400 Heat and a range of kW sizes.

Our team has reviewed this model and this review covers everything you need to know before deciding whether it is the right fit for your property and household.

Technical Specification:

Manufacturer Baxi 
Model 400 Combi, 400 Combi LPG and 400 Heat
Condensing Yes
Efficiency Rating 89%
Energy Efficiency Class A-Rated
LPG Compatible Yes – in the case of the Combi LPG
Warranty 5-year warranty
Central Heating Max. Output 30kW
Mounting Wall Mounted
Weight 19.5 kg (Heat) or 26 kg (Combi and LPG)
Dimensions 400 Heat: 625 mm (Height) x 370 (Width) x 270 mm (Depth)400 Combi/400 Combi LPG: 700 mm (Height) x 395 (Width) x 279 mm (Depth)

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 volume
Get Your FREE Online Quote Today!
Save up to £590 PER YEAR on your heating bills.
Getting a quote takes less than 2 minutes. No obligation.
Save up to £590 PER YEAR!


The Baxi 400 Boiler is a quiet and compact heating and water system. All of the 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 – which weighs 19.5 kg, is one of the lightest boilers currently available on the market.

  • Can be installed in a standard cupboard in a kitchen, bathroom or airing cupboard
  • Can be integrated with smart thermostats and controls, so that it can be controlled from a mobile phone or tablet wherever you are with an internet connection
  • The Baxi 400 Combi LPG features a rigid filling loop for a neater finish
  • Comes with a standard 5-year parts and labour warranty
Get Your FREE Online Quote Today!
Save up to £590 PER YEAR on your heating bills.
Getting a quote takes less than 2 minutes. No obligation.
Save up to £590 PER YEAR!

Our thoughts:

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

It is easy to install and service, available in multiple heating outputs to accommodate most homes and features an in-built frost thermostat and a choice of different flue lengths.

A trusted brand

Baxi is an international company, with headquarters in The Netherlands, but they have been synonymous with reliable British-manufactured boilers since 1866.

They are particularly popular with landlords who are looking for a reliable, easy to install and quiet boiler option for their rental properties.

Energy-efficient so you reduce your bills

The Baxi 400 has an ErP ‘A’ rating and an energy efficiency running performance of 89%. While there are more efficient boilers out there, for maximum energy efficiency, there is a range of compatible wired and wireless controls available, including the option to connect with a smart energy management system such as the uSense smart room thermostat which can increase energy efficiency within your home.

By controlling the boiler from your smartphone, computer or tablet you can ensure your heating is managed carefully and you can take advantage of additional features, including temperature scheduling, the ability to input holiday periods, and anti-frost protection.

Easy Installation

Being wall-mounted, and compact and lightweight, all of the Baxi 400 model boilers are popular with installers because they are easy to set up and install.

Wide availability of parts 

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

Boilerhut Ltd is an Introducer Appointed Representative (Financial Services Register No. 836593) of Phoenix Financial Consultants Limited (“Phoenix”). Phoenix is a credit broker, not a lender. Phoenix is authorised and regulated by the Financial Conduct Authority (FRN: 539195), and offers finance from its panel of lenders. All finance subject to status and credit checks.

© Copyright - Boilerhut 2023 - Registered in England & Wales, company number: 8615540 Vat number: GB- 169 0436 95