Potterton Promax Ultra Combi


A condensing natural gas and LPG ready boiler, the Potterton Promax Ultra Combi has something to offer everyone.

The Promax Ultra Combi is perfect for compact spaces with no special conversion kits, cylinders, or loft tanks.

However, the option of a 24kW to 40kW output makes the Potterton Promax Ultra Combi ideal for a small, medium, or large home.

In addition, this combi boiler operates on and off the gas grid, offering a versatile solution to home heating.

How Much Does this Boiler Cost?

Promax-Ultra-Combi-130x200-1One of the first questions people ask when considering different boiler brands is, “What is the cost?” And that can be a tricky one to answer as the cost comes down to a number of factors.

The overall cost of owning a Potterton Promax Ultra Combi depends heavily on the boiler’s energy output. There are four output energy options: 24kW, 28kW, 33kW or 40kW.

Smaller energy output boilers like the 24kW, and 28kW Potterton Promax Ultra Combi are suitable for tiny homes and flats.

However, larger properties will require a boiler with a higher energy output to provide an adequate amount of warm water.

The price of a Potterton Promax Ultra Combi varies from £960 and £1,310 – and that’s just the base cost for the unit.

Additionally, you’ll have to factor in the installation costs, which can differ depending on the supplier. This may seem like a lot to spend on a boiler, but it’s easy to find a good deal if you’re willing to spend some time comparing prices from different suppliers.

Is this Boiler Suitable for My Home?

The Potterton Promax Ultra Combi boiler is a combination boiler that is an extremely popular type of boiler in the United Kingdom.

A combi boiler is quite convenient in that it doesn’t require the installation of separate hot water storage cylinders or cold-water tanks.

Instead, the water is instantly heated after being pumped directly from the main supply. This makes a combi boiler both a space-saving and energy-efficient choice.

If you’re looking for something that’s compact and environmentally friendly, a combi boiler might be the right fit for you.

If you research the Potterton Promax Ultra Combi or combi boilers, you will find that those who choose them for their homes are happy with them, as is seen in the many positive online reviews.

Still, you’ll want to ultimately get the opinion of a qualified professional before making a big purchase like this – so consult with someone who understands your heating needs.

Before suggesting a suitable boiler, a Gas Safe registered engineer will assess your property and individual needs.

Is it a High-Efficiency Boiler?

A high-efficiency boiler is key to reducing your carbon footprint and energy bill. The Potterton Promax Ultra Combi has a rating of ‘A’ and an SAP seasonal efficiency of 89.1%.

In addition to this, the Potterton Promax Ultra Comb is endorsed by the Energy Saving Trust, which maintains strict criteria for high-efficiency boilers. This means the Potterton Promax Ultra Comb is, without a doubt, a high-efficiency boiler.

One expensive way to maximise the savings on your energy bill and minimise your carbon emissions, you can upgrade your boiler.

The boiler efficiency can be improved with various upgrades and additional extras such as the programmable wireless sensors and Multifit GasSaver heat recovery system.

Key Controls and Features

The Potterton’s Promax Ultra Combi comes fully equipped with a host of controls and features.

To make your heating engineer’s job easier, the boiler comes with built-in frost protection, flue length options up to 20 metres which offers the flexibility of siting and front access to components. A built-in indicator also reminds you to call your engineer because your annual service is due.

Your Promax Ultra Combi also comes with the option of an outdoor weather sensor. This is great for enhancing comfort levels and improving system control.

Speaking of system controls, the boiler has an on/off switch with reset, an LED display to show current boiler status, temperature, fault diagnoses and adjustable central heating, and hot water temperature controls.

All of this makes owning a Potterton’s Promax Ultra Combi a relatively stress-free experience, as you’re never in the dark when it comes to what’s going on with the boiler.

You’re not getting an ordinary combi boiler with the Promax Ultra Combi, this is a high-tech boiler.

The Potterton Promax Ultra Warranty

In order to qualify for the warranty, you will need to register your boiler with Potterton within 30 days of installation and perform an annual service. This will entitle you to a standard warranty which is a 2-year parts and labour warranty.

Pros and Cons

We’ve compiled a list of pros and cons based on user reviews.


  • Suited to any home size
  • Works with both natural gas and LPG
  •  There’s no need for separate cylinder or loft tanks which take up space
  •  With flue length options up to 20m – siting flexibility and front access making maintenance much easier for your heating engineer
  •  Built-in annual service indicator
  •  Provides maximum energy efficiency
  •  Optional extra: outdoor weather sensor – enhances comfort levels and system control
  •  Optional extra: Baxi Multifit GasSaver heat recovery system which can reduce the energy used to heat water by up to 37% annually


  • 2-year warranty – many people would prefer a more extended standard guarantee

Interestingly, the Potterton Promax Ultra Combi seems to be more popular with engineers than consumers.

Potterton Promax Ultra Combi: In Summary

To recap, the Potterton Promax Ultra Combi comes in four different energy output options,24kW, 28kW, 33kW or 40kW.

It also comes in four different hot water flow rates, 9.8, 11.5, 13.5 or 16.4 litres per minute. The combi boiler does not require any extra equipment installations. It has the following physical dimensions: 763mm (H) x 450mm (W) x 355 (D).

Adding to its versatility, the Potterton Promax Ultra Combi uses either gas or LPG as its fuel source. If you care about the environment, this boiler is A-rated for efficiency.

And most importantly, the Potterton Promax Ultra Combi is priced between £960 and £1,310, and come with a standard 2-year warranty.