Want to learn more about the Baxi Platinum combi boiler? Then you’ve come to the right place.

In the past, I’ve come across a few clients who were looking for a 10-year guarantee, but felt Worcester Bosch was too expensive – which is why I started recommending the platinum range of Baxi combis to them.

Let me tell you why:

The Baxi platinum range typically works out cheaper than the Worcester Bosch equivalent by a few hundred pounds, when supplied and fitted with controls and filter. Plus, they have a little extra output to the hot water which equates to around an extra 1/2 litre per minute (on the 33kw & 40kw models).

However, just like any heating engineer will tell you, it doesn’t just come down to price, so let’s take a closer look at the Baxi Platinum combi boiler range below, including which type of home they’re best suited to.

Output/flow rate

Below, I’ve given you a brief overview of the outputs available to your central heating, as well as the flow rate you can expect to your taps.

  • Platinum 24HE: 24kw to heating and 24kw to hot water: 9.8 litres per min at 35 degrees Celsius
  • Platinum 28HE: 24kw to heating and 28kw to hot water: 11.5 litres per min at 35 degrees Celsius
  • Platinum 33HE: 28kw to the heating and 33kw to the hot water: 13.5 litres per min at 35 degrees Celsius
  • Platinum 40HE: 32kw to the heating and 40kw to the hot water: 16.4 litres per min at 35 degrees Celsius

TIP: To make sure you choose the correct output for your home, I’d recommend getting your chosen Gas Safe registered heating engineer to measure your home’s heat loss – just in case!

PLEASE NOTE: If you need the 33 or 40kw boiler, please ask a heating engineer to check your incoming water pressure and flow rate before installing. This is because you won’t see the same brilliant flow rates if your incoming pressure isn’t sufficient.

Size and special features

The Baxi Platinum combis measure in at 780mm high x 450mm wide x 345mm deep – a bit too big to fit in a standard kitchen cupboard.

This boiler is compatible with Baxi’s extra long twin flue and Multifit flue kits, which means you can have plenty of options when it comes to deciding where to fit your new boiler.


As I mentioned above, the Baxi Platinum range of boilers comes with Baxi’s fantastic 10-year no-quibble guarantee – which is valid as long as your boiler is serviced annually by a Gas Safe registered engineer.

Ideal for

Welcome to the section where I tell you which specification boiler should be best suited to your home (although always get a heat loss measurement to be 100% sure):

Baxi Platinum 24kw combi: Ideal for a small property with 3-5 radiators and a shower (although it might be a bit slow to fill a bath).

Baxi Platinum 28kw combi: Ideal for a small property with 1 – 2 bedrooms and around 4 – 7 radiators, with a shower and bath.

Baxi Platinum 33kw combi: Ideal for a 3-4 bedroom family home with around 6-9 radiators, high pressure shower and a bath. It’s a great flow rate for the shower and will easily fill your bath.

Baxi Platinum 40kw combi: Ideal for large flat with high ceilings, or a detached 4-bedroom house. Will happily heat 9-14 radiators, and will easily run 2 showers at once. Fills a deep cast iron bath quickly.

ERP rating

All of the boilers in the Baxi Platinum combi range are ERP rated A with a 90% efficiency rating.


It’s easy to see why the Baxi Platinum combi range is popular with so many of my customers, as they get the same great 10-year no-quibble guarantee as they’d get with a Worcester Bosch boiler, with an added saving of hundreds of pounds!

Above, I’ve included everything you need to know about each model specification, included the heating and hot water output, flow rate, size and special features, guarantee, ERP rating and more.

You can also find a rough guide to help you figure out which model might be best for your home – but to be on the safe side, please ask your chosen heating engineer to conduct a heat loss test and check your incoming water pressure before fitting any boiler.

What do you think of the Baxi Platinum combi boiler range?