Written by Stephen Day
Gas Safe Engineer
Updated: 9th October, 2025
With nearly 70, yes 70 years of designing and manufacturing boilers behind them, ATAG can be considered experts in the heating industry, and in this article we will be analysing some of their finest boiler models, including their prices and key features.
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Originating in the Netherlands almost 7 decades ago, ATAG heating technology continues to deploy the same dedication to crafting top class boilers in terms of performance and reliability.

With a five star ‘Excellent’ rating on Trustpilot from over 4000 reviews, ATAG clearly wants their customers to achieve the highest levels of satisfaction when using their products, living up to their company ethos of ‘a brand you can trust’.

Compact and quiet, the IC combi boilers can easily be installed in a standard kitchen cupboard. The iC combi is also extremely efficient and ATAG claim it can save you up to £320 on your gas bills per year.
Compact design
ATAG iCon stainless steel heat exchanger (unique lifetime replacement guarantee)
Very low operational volume due to bottom up modulation
Built in weather compensation
Available outputs | 24kW, 28kW, 36kW, 40kW |
Energy efficiency | A - 94% |
Flow rate @35°C - L/min | 10.1, 11.5, 14.9, 16.2 |
Dimensions | 440 (w) x 355 (d) x 700mm (h) |
Price range (not including installation)- £1,300 - £1,480
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Described as the combi of the future, the Economiser range is an upgraded version of the iC combi, containing an economiser that captures waste energy from flue gases and uses it to preheat the mains water production. The resultant savings in heat and water will begin to add up in no time.
Default codes displayed on LCD for quicker diagnostics
Integrated frost protection
A standard boiler casing houses an integrated passive flue gas heat recovery device
Available outputs | 27kW, 35kW, 39kW |
Energy efficiency | A - 94% |
Flow rate @35°C - L/min | 12.6, 16.1, 17 |
Dimensions | 440 (w) x 355 (d) x 700mm (h) |
Price range (not including installation) - £1,950 - £2,160
Available in a wide range of outputs, this system also contains an integrated ErP pump to control the heat given out by the boiler, ensuring the product is as efficient as possible. The pump and controls are fitted within regular boiler casing offering a space saving solution.
Available outputs | 15kW, 18kW, 24kW, 32kW, 40kW |
Energy efficiency | A - 93% |
Dimensions | 440 (w) x 355 (d) x 700mm (h) |
Fitted ErP-ready pump for low electrical consumption and improved efficiency
Fully compatible with solar thermal hot water systems and ATAG iSteel twin coil cylinder range
Integrated anti-cycling function
Combined condensate outlet and pressure relief valve
Price range (not including installation) - £1,270 - £1,510
The iR heat only or conventional boiler is a robust yet efficient take on the traditional home heating system. With built in frost protection for durability and an overall easiness of use, this premium ‘conventional’ boiler is suited for any type of home.
Available outputs | 15kW, 18kW, 24kW, 32kW, 40kW |
Energy efficiency | A - 94% |
Dimensions | 440 (w) x 355 (d) x 700mm (h) |
Low operational volume due to bottom up modulation
Five output models available
Compact dimensions
Price Range (not including installation) - £1,150 - £1,390
Here at iHeat we stock only the best and most reliable gas boilers for your home, and while we don't currently stock ATAG, our award-winning stable of Alpha, Viessmann, Worcester Bosch, Vaillant and Ideal can heat your home while saving you money.
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Last updated: 9th October, 2025
Written by Stephen Day
Gas Safe Engineer at iHeat
Stephen Day is a Gas Safe registered and FGAS certified engineer with over 20 years of hands-on experience in the heating, cooling, and renewable energy industry, specialising in boiler installations, air conditioning, and heat pump systems.
LinkedInArticles by Stephen Day are reviewed by iHeat’s technical team to ensure accuracy and reliability.
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