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Baxi 600 24kW, 30kW, 36kW Combi

The Baxi 600 Combi is a fantastic condensing gas boiler that comes with a lengthy warranty and can be installed in a kitchen cupboard.

This affordable combi boiler has been designed around feedback from installers and engineers to ensure it meets the requirements of most homeowners across the UK. As well as being compact and lightweight, the Baxi 600 Combi lets you make the most of the available space in your home and is even compatible with a smartphone heating control system. Want to know more? You can find all of the important facts and details below.

How Much Does this Boiler Cost?

The Baxi 600 Combi can be purchased with an output of 24kW, 30kW or 36kW, so the price will depend on which size is required for your property. Although the cost of the boiler usually ranges between £710 and £1060, the amount you’ll need to pay will also be determined by which supplier or installer you choose to buy the appliance from. It’s worth shopping around to see if any companies or heating professionals are offering any deals on this boiler and the installation.

How will I know if this Boiler is Suitable for My Home?

Combi boilers (or combination boilers) are ideal for most homes but they are particularly great for properties where space is limited because they don’t need to be installed alongside a hot water storage cylinder or tanks in the loft. Although there is a Baxi 600 Combi option available for small, medium and large homes, most heating engineers will tell you that combi boilers aren’t the best for dwellings with more than one bathroom because they have trouble coping with too many taps running simultaneously.

When it comes to choosing the right output, the greater your demands, the higher the output must be. As the most important things to get right are the boiler type and output, we always recommend you consult a qualified Gas Safe engineer before you any spend money on a new boiler.

Is it a High Efficiency Boiler?

Yes. The Baxi 600 Combi is an A-rated boiler that has an excellent efficiency of 93%. We actually think this is pretty impressive for a reasonably priced condensing gas boiler. What’s more, this boiler is compatible with the Baxi uSense smart room thermostat that allows you to control your central heating from a smartphone or tablet. This optional accessory also lets you monitor how much energy you’re using to help you save some cash on your bills.

Does this Boiler have a Good Range of Controls and Features?

We think so. The user controls include adjustable central heating and hot water temperature switches, along with a clear LCD display that shows the temperature, boiler status and fault identification. You can purchase some optional controls to improve efficiency, performance and comfort levels, such as mechanical timers and a selection of room thermostats (including the smart uSense control). It’s a small boiler that can be installed in a kitchen cupboard and has a facility within its casing to hide the pipes. The Baxi 600 Combi also comes with an easy-fill permanent filling link to make it easy for you to top up your system, as well as a simple hanging bracket and different flue lengths to enable you to choose where you would like the boiler to be fitted.

How long is the Warranty on this Boiler?

You’ll like this one. The Baxi 600 Combi comes with an impressive 7-year parts and labour warranty as standard.

Baxi 600 Combi By Size and Price


ModelTypeDimensionsMaximum Flow RateOutputEfficiency RatingTypical Price
600 Combi 24CombiH – 700 mm
W – 390 mm
D – 285 mm
15 l/min24 kWA 90% and above£710
600 Combi 30CombiH – 700 mm
W – 390 mm
D – 285 mm
15 l/min30 kWA 90% and above£850
600 Combi 36CombiH – 700 mm
W – 390 mm
D – 285 mm
15 l/min36 kWA 90% and above£1060

Summary of Important Information

  • Priced between £710 and £1060
  • Heating output of 24kW, 30kW or 36kW
  • Hot water flow rates of 10.2, 12.2 or 15 litres per minute
  • Dimensions of 700mm (H) x 390mm (W) x 285mm (D)
  • Uses gas as its fuel source
  • A-rated for efficiency
  • Smart compatible
  • 7-year warranty as standard

Pros and Cons

Even though Baxi doesn’t have the best overall Which? score we’ve ever seen, we do think the Baxi 600 Combi is a powerful combination boiler that boasts a fantastic warranty. Most leading brands only offer a guarantee of this length when you choose to have an optional filter or control installed, but Baxi isn’t asking you to do that when you purchase this boiler. Below, you’ll find our full list of pros and cons.


  • Fits in a 290mm deep kitchen cupboard
  • Suited to small, medium and large-sized homes
  • No need for separate cylinder or loft tanks
  • Pipes are hidden within the boiler casing
  • Easy to use and service
  • NOx Class 5 boiler – kinder to the environment
  • Provides maximum energy efficiency – reduce fuel bills and carbon emissions
  • Compatible with uSense smart room thermostat – can monitor your energy use and control your heating using a smartphone or tablet, wherever you happen to be
  • 7-year parts and labour warranty


  • Baxi boilers have and overall Which? score of 54%
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