Layout Curve

Baxi 400 Combi Review

Baxi 400 Combi Boiler Review


Baxi 400 Combi Review Compare Boiler Quotes

Looking for a new boiler system? Have you had your system break down or been told you need to find a new boiler? Then Compare Boiler Quotes boiler reviews are your saviour in the dark times of boiler breakdowns! 

As with all our other reviews, we look into the company as a manufacturer of boiler systems to see if they have the pedigree and experience to provide a reliable system. We also look at the internal components, the features, the external control systems, the pricing and warranty and come to a conclusion overall.

This is how we review all boiler systems available in the UK today and give you the best options after our research.


Let’s start with the company, and move on to looking at the Baxi 400 Combi’s features.


Who Are Baxi?


Baxi 400 Combi Review Compare Boiler QuotesBaxi is one of the more well known UK boiler brands and has been going strong as a boiler manufacturer since 1866.

 Baxi is known as a company with a drive for innovation, service, and quality and has a well trained network of over 200 Gas Safe engineers . They are a trusted name with boiler systems being ranked by several review sites due to their quality construction, high efficiency and compact space. 


Baxi is the progenitor of the group named Baxi Heating. This includes other boiler manufacturers who Baxi has strategically acquired over the years. These include the highly respected brands such as Potterton, Heatrae Sadia, Megaflow, among others. 


Baxi actively promotes environmental sustainability and outstanding technical support to all their valued customers. 

They are also well known in the UK for delivering the best value via their energy efficient, reliable, and high quality products. 


Brief Look 


Baxi 400 Combi Review Compare Boiler QuotesThe Baxi 400 Boiler series comes in two varieties. The 424 24kW model and the 428 28kW model. Today we will be looking at the 28kW model because this is more suitable for the average UK home, as the 24Kw variety is not as powerful for heating your home and providing hot water. 

The Baxi 400 Combi is ideal for small and medium households which would like a boiler that is small enough to fit inside a kitchen cupboard. With an A efficiency rating and the compact size, it won’t be too noticeable in your kitchen or other cupboard space.


Energy Efficiency:


The Baxi 400 Combi LPG has an A rating for heating and hot water efficiency. It is an energy efficient combination with a compact size . This boiler will therefore help to cut the cost of your fuel bills year in, year out. You can combine this system with an optional uSense smart room thermostat for even more increased efficiency. This additional system will  enable you to change heating times from your smartphone or tablet, meaning you don’t even need to be at home to control your heating system, a real modern inclusion in a boiler system.


How Much Does the Baxi 400 Boiler Cost?


The Baxi 400 Combi with its varying output models of 24kW or 28kW is priced on average between £650 and £725.

Please note that generally, the installation of the boiler will cost more than the actual boiler itself so the typical installation price of this boiler would be anywhere from £1200-£1800. 

This price can increase if you need to switch from another system for example. If you currently have a system or regular boiler in your home with an external cylinder for cold and hot water, this will all need to be removed if you switch to a combi system. This is because a combi system boiler will heat the hot water internally in the boiler unit and doesn’t require any external tanks. 


Is This Boiler Suitable for My Home?Baxi 400 Combi Review Compare Boiler Quotes


The Baxi 400 series will be suitable for homes and apartments with 1-3 bedrooms and 1 bathroom. If you have 2 bathrooms and more you will require a larger system. The 28kW variety in particular will heat up to 12 radiators at once so it can provide the central heating for large homes just not the hot water capacity.


Easy to Use Controls:

The Baxi 400 series control systems are located on the front of its casing. Control systems such as an operating mode selector and switches that enable you to adjust the hot water and central heating temperatures. 

The system also has a fault diagnosis LCD display. This shows you the boiler temperatures and current status.It is available with the optional smart control, or you can choose from a selection of other accessories including mechanical timers and plug-in RF thermostats. 




The Baxi 400 systems come with a standard 5 year warranty, not bad but this is lower than other manufacturers with more affordable and higher quality systems.


Baxi 400 Combi Review Compare Boiler QuotesCore Features:


  • ERP Rating: A Heat, A Water
  • Efficiency Rating: 89%
  • Band:    A Rated
  • LPG Compatible: Yes
  • Standard Warranty: 5 Years
  • kW Options: 24kW 28kW
  • Mounting: Wall mounted
  • Flow Rate: 11.5 l/min
  • Typical Price (inc VAT) £650
  • Typical installation Cost (inc VAT)* £500 – £1,000
  • Total Cost £1,200 – £1,800



The Baxi 400 is a decently priced, moderately performing system with a lower range output. It won’t be suitable for most homes in the UK above 3 bedrooms however it would suit smaller homes fine . 

The warranty is on the lower end, and the performance also average in terms of output and hot water heating. We therefore would recommend a similarly price lower end system. 

The Viessmann 050-w is a much better system with an incredible 98% efficiency, It also has a higher flow rate of up to 12.1L/m.


If you need a boiler quote we can recommend our install partner Boiler Central as it is simple and easy to get a reliable system installed in your home. 

Need a custom boiler quote? We can help by answering 9 simple questions about your home. You will be on your way to having your new boiler installed in no time with a day and time that suits you. You can also get fantastic, flexible financing or pay in full online with no headaches!


Thanks for joining us today for another boiler review, we hope to see you back here soon!


Get a fixed price in 20 seconds

What fuel does your boiler use

Compare Quotes >

What our customers think

5 Stars on Trustpilot

Would recommend

Stressed when needed a new boiler but easy process with affordable finance. New boiler installed within a few days with option for next day.

Paul Jones 5 Star on Trustpilot

We were very impressed

On the day, they came on time. Lovely people, they kept everything clean. Explained everything to me. No mess, kept me informed.

Anne Cross 5 Star on Trustpilot

Great Experience

Great experience - quick to arrange, easy to work with the very responsive online team and all installed faster than expected.

Ms Baxter 5 Star on Trustpilot

Layout Curve
Compare new boiler prices in 20 seconds onlineGet Your Quotes >