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Baxi 400 Combi

( 33 Reviews )

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The Baxi 400 is a brand new boiler from Baxi which is available exclusively from independent merchants.

Available in outputs of 24kW and 28kW, the Baxi 400 is powerful enough to meet the heating and hot water demands of most property sizes. We've designed it to be one of our quietest boilers - and with it's small, lightweight design it can be installed virtually anywhere in your house. The Baxi 400 comes with a 5 year parts and labour warranty for complete peace of mind.

  • Build Quality is rated at a 5/5 for Baxi 400 Combi :

  • Easy of Use is rated at a 5/5 for Baxi 400 Combi :

  • Features is rated at a 5/5 for Baxi 400 Combi :

  • Value For Money is rated at a 5/5 for Baxi 400 Combi :

  • Overall is rated at a 5/5 for Baxi 400 Combi :

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Review for Baxi 400 Combi by JMW Heating & Plumbing Ltd
4th February 2020

Brilliant budget boiler. landlords love this little boiler which is cupboard fit and easy to use. the installation is very easy and its lightweight too

Brilliant budget boiler. landlords love this little boiler which is cupboard fit and easy to use. the installation is very easy and its lightweight too


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Review for Baxi 400 Combi by Premier Plumbing and Heating
27th November 2019

Brilliant boiler, easy to install and service, works well with controls on opentherm. Easily one of my favourite boilers to install and looks the part when fitted, when servicing its stripped down in a few minutes and that’s when your taking your time.

Brilliant boiler, easy to install and service, works well with controls on opentherm.
Easily one of my favourite boilers to install and looks the part when fitted, when servicing its stripped down in a few minutes and that’s when your taking your time.


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Review for Baxi 400 Combi by Mr Gortons plumbing & heating
4th September 2019

Have fitted a few of these little machines and they are class. They are light weight compact and so easy to fit. Baxi support is second to none

Have fitted a few of these little machines and they are class. They are light weight compact and so easy to fit.
Baxi support is second to none


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Review for Baxi 400 Combi by APJ Lawson Gas Services
29th July 2019

Great boiler, beginning to prefer installing this to the 600 series. Attaching the tails and making the electrical connection are a plus on this model.

Great boiler, beginning to prefer installing this to the 600 series. Attaching the tails and making the electrical connection are a plus on this model.


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Review for Baxi 400 Combi by JB GAS
10th May 2019

Great boiler for the price i have fitted 6 of these now for customers with less of a budget therefore in place of the 600 series and I have to say there spot on for the money and give the installer another option when pricing a competitive job I will be using again soon.

Great boiler for the price i have fitted 6 of these now for customers with less of a budget therefore in place of the 600 series and I have to say there spot on for the money and give the installer another option when pricing a competitive job I will be using again soon.


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Review for Baxi 400 Combi by AOC Plumbing & Heating Services
7th February 2019

Very much a good all round boiler, good for landlords and the 5yr warranty is excellent addition. Good you can put a clock on this compared to the 600. Both the 400 and 600 range is an easy sell for us

Very much a good all round boiler, good for landlords and the 5yr warranty is excellent addition. Good you can put a clock on this compared to the 600. Both the 400 and 600 range is an easy sell for us


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Review for Baxi 400 Combi by Raistrick gas
12th December 2018

Fantastic mid range boiler unbelievably light and easy to install, simple user interface for those customers that are not tech savvy, cupboard fit which is always a bonus

Fantastic mid range boiler unbelievably light and easy to install, simple user interface for those customers that are not tech savvy, cupboard fit which is always a bonus


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Review for Baxi 400 Combi by S & L Plumbers
30th November 2018

This boiler has changed my mind about Baxi, the product is a really well built unit and weights absolutely nothing compared to other Combination boilers. Also offering a good warranty and easy to fit. Top marks for a great boiler

This boiler has changed my mind about Baxi, the product is a really well built unit and weights absolutely nothing compared to other Combination boilers. Also offering a good warranty and easy to fit. Top marks for a great boiler


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Review for Baxi 400 Combi by Gold BoilerCare Ltd
5th October 2018

A great little boiler. Cupboard fit and so quiet. Easy to install and great after sales help from the local rep. Will certainly be fittings a few more

A great little boiler. Cupboard fit and so quiet. Easy to install and great after sales help from the local rep. Will certainly be fittings a few more


Response from Baxiregarding A review for Baxi 400 Combi
5th October 2018

Thank you so much for taking the time to leave such great feedback, appreciate it.


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Review for Baxi 400 Combi by BoilerOne
27th July 2018

This boiler is great to install and a favourite for me so far, I save a lot of time on installation compared to the next boiler, cupboard fit, one man lift so can leave the apprentice to get on with it. Speedy response from Baxi aftercare

This boiler is great to install and a favourite for me so far, I save a lot of time on installation compared to the next boiler, cupboard fit, one man lift so can leave the apprentice to get on with it. Speedy response from Baxi aftercare


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Review for Baxi 400 Combi by Blake Services Solutions
27th February 2018

Great budget boiler, Baxi finally got it right. price, quality, size and weight. Ticks all the boxes. I'm now able to offer a budget boiler if the Duo Tec or 600 range are not suitable

Great budget boiler, Baxi finally got it right. price, quality, size and weight. Ticks all the boxes. I'm now able to offer a budget boiler if the Duo Tec or 600 range are not suitable


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Review for Baxi 400 Combi by K.norton plumbing & heating
24th February 2018

The best feature about this boiler for me is the weight of the appliance. I was able to carry it from my van into the house ,up the stairs and lift it onto the wall in side a cupboard,on my own. It is handy to have the boiler secured hot the wall and have the flue connected straight away.the flue connection measurement was slightly awkward and not clearly written in the instructions.the filling loop kit came separately and was quite fiddly to fit ,especially as it was so close to the boiler return pipe where I had fitted a magnecleanse.however the fittings were good quality and well thought out.the route for the wiring I foundawkward as there was nothing in the instructions to show you how.when it came to firing up and commissioning it was instant and simple and the pump purge feature was very useful.I would highly recommend this boiler for ease of 7installation and performance.

The best feature about this boiler for me is the weight of the appliance. I was able to carry it from my van into the house ,up the stairs and lift it onto the wall in side a cupboard,on my own. It is handy to have the boiler secured hot the wall and have the flue connected straight away.the flue connection measurement was slightly awkward and not clearly written in the instructions.the filling loop kit came separately and was quite fiddly to fit ,especially as it was so close to the boiler return pipe where I had fitted a magnecleanse.however the fittings were good quality and well thought out.the route for the wiring I foundawkward as there was nothing in the instructions to show you how.when it came to firing up and commissioning it was instant and simple and the pump purge feature was very useful.I would highly recommend this boiler for ease of 7installation and performance.


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Review for Baxi 400 Combi by Dyscarr Property Services
23rd February 2018

Easy install with mounting bracket and not a jig. Wiring external controls simple with molex plugs. Commissions helped with de-aerate function. Customer friendly controls 5 year guarantee for piece of mind for customer.

Easy install with mounting bracket and not a jig. Wiring external controls simple with molex plugs. Commissions helped with de-aerate function. Customer friendly controls 5 year guarantee for piece of mind for customer.


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Review for Baxi 400 Combi by J.C.O Plumbing and Gas
9th February 2018

I have fitted about 5 of these boiler and never had an issue with them. They are extremely light and easy to commission. Only time will tell how reliable they are as they haven't been out for long. But initial impressions are very good

I have fitted about 5 of these boiler and never had an issue with them. They are extremely light and easy to commission. Only time will tell how reliable they are as they haven't been out for long. But initial impressions are very good


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Review for Baxi 400 Combi by M.B.Barden & Son Heating and Plumbing.
2nd February 2018

Fitted two of these now and I have to say I am very impressed with this model. Easy to hang on the wall, brass connections and a nice little channel to run the cables in is a great idea. Simple to connect Baxi controls with face plate option and easy to commission .

Fitted two of these now and I have to say I am very impressed with this model.
Easy to hang on the wall, brass connections and a nice little channel to run the cables in is a great idea.
Simple to connect Baxi controls with face plate option and easy to commission .


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Review for Baxi 400 Combi by Home Heating UK
26th January 2018

Baxi again showing they are no1 in the boiler market Fitted about 10 in the last 6 months and been great Baxi power

Baxi again showing they are no1 in the boiler market
Fitted about 10 in the last 6 months and been great
Baxi power


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Review for Baxi 400 Combi by Pinnacle Plumbing And Gas Services
4th December 2017

Nice boiler, lightweight, small and compact and extremely quiet. Prv is easy to install too. Good value for money, comes with a 5 year warranty or can upgrade to a 7 year for £60 or so

Nice boiler, lightweight, small and compact and extremely quiet. Prv is easy to install too. Good value for money, comes with a 5 year warranty or can upgrade to a 7 year for £60 or so


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Review for Baxi 400 Combi by PMA Gas Solutions
18th November 2017

Great cupboard fit boiler, fitted over 15 of these now. Customers were happy with them too. Easy to installer and 1st service was a breeze

Great cupboard fit boiler, fitted over 15 of these now. Customers were happy with them too.

Easy to installer and 1st service was a breeze


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Review for Baxi 400 Combi by Mato plumbing and Heating
19th September 2017

Baxi 428 boiler fitted four of boilers Loved this boiler so light easy to commission has open therm so used nest controller

Baxi 428 boiler fitted four of boilers
Loved this boiler so light easy to commission has open therm so used nest controller


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Review for Baxi 400 Combi by Nick Keeble and Son
27th August 2017

Good mid budget combi. Light and easy to fit and commission. Backed up by Baxi Works which gives good rewards

Good mid budget combi. Light and easy to fit and commission. Backed up by Baxi Works which gives good rewards


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Review for Baxi 400 Combi by Stuart Roberts Limited
17th August 2017

Great little boiler, lightweight and small, also very quiet. The hot water performance is very good also.

Great little boiler, lightweight and small, also very quiet. The hot water performance is very good also.


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Review for Baxi 400 Combi by Aquatech Plumbing & Heating
3rd June 2017

Nice boiler to fit cheap only compliant would be where you wire in I found they bit of pain part from that good boiler

Nice boiler to fit cheap only compliant would be where you wire in I found they bit of pain part from that good boiler


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Review for Baxi 400 Combi by DJPHS
11th May 2017

These don't seem like bad boilers, they are very compact and lightweight. Like most Baxi's, the water connections underneath are awkward to tighten. I think in the future, there is a good chance that the slider the PCB housing uses will break and they will end up covered in closure plate tape.

These don't seem like bad boilers, they are very compact and lightweight. Like most Baxi's, the water connections underneath are awkward to tighten. I think in the future, there is a good chance that the slider the PCB housing uses will break and they will end up covered in closure plate tape.


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Review for Baxi 400 Combi by KJS Plumbing and Heating
8th May 2017

The 428 is a great little boiler. Lightweight and easy to install even in a cupboard. I personally am not a fan of composite coponents and prefer the brass components that come with the duo-tec. Although baxi do claim that their composite is as good as brass. Time will tell. The 428 is open therm compatible which means it can work with he latest energy saving controls.

The 428 is a great little boiler. Lightweight and easy to install even in a cupboard.
I personally am not a fan of composite coponents and prefer the brass components that come with the duo-tec. Although baxi do claim that their composite is as good as brass. Time will tell.
The 428 is open therm compatible which means it can work with he latest energy saving controls.


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Review for Baxi 400 Combi by MB Gas & Heating Ltd
30th April 2017

Lightweight , compact , reasonable price, fits in kitchen cupboards nicely. A lot of plastic inside which is soar to the eyes as I prefer seeing shiny new metal . All in all a great mid range boiler with decent warranty

Lightweight , compact , reasonable price, fits in kitchen cupboards nicely. A lot of plastic inside which is soar to the eyes as I prefer seeing shiny new metal .
All in all a great mid range boiler with decent warranty


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Review for Baxi 400 Combi by Mansell plumbing
29th April 2017

Love the new Baxi 428, it's my new mid to high range boiler, it's light, easy to use build quality Value for money Easy to use

Love the new Baxi 428, it's my new mid to high range boiler, it's light, easy to use build quality
Value for money
Easy to use


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Review for Baxi 400 Combi by Hampshire Technical
28th April 2017

Recently installed the 428 and i must admit it was a fit. Looks clean and well thought out and easy to work on.

Recently installed the 428 and i must admit it was a fit. Looks clean and well thought out and easy to work on.


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Review for Baxi 400 Combi by DCB Plumbing & Heating
28th April 2017

The new 400 is a cupboard fit boiler, centre flue and no pipe jig, 5 years guarantee out the box. Baxi is renowned for excellent built quality and fantastic customer care

The new 400 is a cupboard fit boiler, centre flue and no pipe jig, 5 years guarantee out the box.
Baxi is renowned for excellent built quality and fantastic customer care


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Review for Baxi 400 Combi by Afterglow Plumbing & Heating Ltd.
26th March 2017

I fitted one of these last week. Nice little boiler, pretty quite when operating. Light to pick up and compact in design so easily fit in a kitchen unit. Looks a bit fiddly to work on to strip down to do repairs but I'm sure once I've taken one apart it will become easy. Worked well with nest 3rd gen using open therm. Got another one going in next week. The price is good too.

I fitted one of these last week. Nice little boiler, pretty quite when operating. Light to pick up and compact in design so easily fit in a kitchen unit. Looks a bit fiddly to work on to strip down to do repairs but I'm sure once I've taken one apart it will become easy. Worked well with nest 3rd gen using open therm. Got another one going in next week. The price is good too.


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Review for Baxi 400 Combi by Jake Matthews Property Development and Management
20th March 2017

Brillent compact boiler, seemed easy enough to install and works brilliantly. Heats up a fairly big house no problem and quickly. Brillent product, quality company.

Brillent compact boiler, seemed easy enough to install and works brilliantly. Heats up a fairly big house no problem and quickly. Brillent product, quality company.


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Review for Baxi 400 Combi by SAFGas Ltd
20th March 2017

For a small boiler, the quality is right up there which also makes it really easy to both install & use as a customer. All of the features of more complicated boilers are there but just easier to use and for the money that i purchased the boiler for, it's great value all round. The added bonus is that it comes with a 5 year warranty as standard - as long as it is serviced each year - but this can be made longer if preferred by other means. Baxi have really thought about this boiler & i reckon it will be around for quite a while.

For a small boiler, the quality is right up there which also makes it really easy to both install & use as a customer. All of the features of more complicated boilers are there but just easier to use and for the money that i purchased the boiler for, it's great value all round.
The added bonus is that it comes with a 5 year warranty as standard - as long as it is serviced each year - but this can be made longer if preferred by other means.
Baxi have really thought about this boiler & i reckon it will be around for quite a while.


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Review for Baxi 400 Combi by The Boiler Guys
20th March 2017

The Baxi 428 is a great little compact boiler, it went in without any issues, it's nice and quiet, and warmed up the freezing house very quickly.the customer was amazed at the difference between the Baxi and his old boiler.I would be happy to install this boiler again , anytime.

The Baxi 428 is a great little compact boiler, it went in without any issues, it's nice and quiet, and warmed up the freezing house very quickly.the customer was amazed at the difference between the Baxi and his old boiler.I would be happy to install this boiler again , anytime.


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Review for Baxi 400 Combi by R McGarvie Gas Services
16th March 2017

So easy to install, all goes together perfectly, wiring is easy to get to. Lightweight & easy to lift onto the bracket. Think Baxi are onto a winner with this one.

So easy to install, all goes together perfectly, wiring is easy to get to.
Lightweight & easy to lift onto the bracket.
Think Baxi are onto a winner with this one.