ATAG boilers review

ATAG boilers are famed for high-tech designs with a large amount of brass and steel components that give them a premium reputation. See how the brand performed in our latest boiler survey.

Our new boiler survey has revealed that most ATAG customers are satisfied, although satisfaction rates of 69% lag behind other premium brands such as Worcester Bosch and Vaillant. But this score only represents 20% of the overall total.

Only Which? members can access our full results and find out how ATAG boilers stack up against the competition. Log in now or join Which? to access the full results.

ATAG gas boiler score

In our survey, 83% of ATAG boiler owners are satisfied. This is four percentage points beneath the average satisfaction rate. ATAG customers are more likely to say they're simply 'satisfied' (32%) than 'very satisfied' (30%).

Some 84% of ATAG boiler owners would recommend the brand to someone else. 

It's not an inspiring customer score for such a premium brand, but this is only a small part of the total picture. Engineers' scores plus reliability data makes up 80% of our brand score.

Sign up for all the results and the complete verdict.

We heard from 198 expert engineers who scored boiler brands on several tests. We asked them to score gas boiler brands on the following:

• The ease of sourcing spare parts 
• How easy it so to change a common component (a heat exchanger)
• The ease of servicing the brand's boilers
• The build quality of the brand's boilers
• The quality of technical support provided by the manufacturer
• Whether or not engineers would recommend the brand to consumers (we filter out incentivised and brand affiliated engineers).

We aggregate all of these scores and use them to create our 'overall engineers' score', which is 40% of our total brand score.

Which? members can see how engineers rated ATAG gas boilers on all of these tests by logging in, while others can sign up to Which? to unlock our full analysis.

Boilers are major purchases you should only make once every 10 - 20 years. You can keep yours for longer if you get it regularly serviced and if you get faults fixed quickly.

We've asked people who bought a boiler in the past six years about whether theirs is fault-free. When faults are reported, we measure how serious they were, how long it took for the first fault to happen, and we confirm that it was fixed by an engineer.

Using this data, Which? members can see which brands produce boilers that are less prone to fault than others.

Sign up for all the results.

Where to buy ATAG boilers

It's easy to rush into making a decision, especially if your boiler breaks down in winter, but we recommend getting a couple of quotes from a qualified heating engineer and comparing costs. Our Trusted Trader service can link you up with vetted boiler installers in your area.  

You could also buy a boiler yourself and hire an installer. Before you go ahead, it's worth getting advice from an expert who can assess your current heating system and identify the type of boiler that meets your specific needs. If you buy a boiler without having an installer lined up, you could find yourself struggling to find someone willing to set it up for you. An installer may have access to trade or wholesale prices, and will be able to recommend a model based on a holistic assessment of your home and heating system.

Only a Gas Safe Registered engineer/installer can install a new boiler. It's both dangerous and illegal to do so yourself if you're not qualified. 

Where to buy a boiler – find out what your options are.

Are ATAG boilers efficient?

New boilers must be A-rated, but how efficiently your boiler works in practice depends on several factors, including how you use it and how well it's installed. Use a Which? Trusted Trader for your boiler installation and regular maintenance.