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ATAG iC Economiser Plus Combi Boiler

The ATAG iC Economiser Plus Combi boiler range includes models to suit the needs of different-sized homes.

Thanks to ATAG’s patented Economiser Plus, this boiler is the ultimate in domestic efficiency and has been hailed as the combi of the future. It comes in three sleek models with different outputs, making it suitable for not just small and medium-sized home but also large homes with greater heating and hot water demand. The ATAG iC Economiser Plus Combi is also a compact boiler with a lengthy warranty that includes all parts and labour. 

How Much Does this Boiler Cost?

There are three models to choose from in the ATAG iC Economiser Plus Combi range, including 27kW, 35kW and 39kW. Prices start from £1,950 and go up to around £2,160 and the amount you need to pay to own this boiler will depend on which output you require. If you have a small home with low demand for heating and hot water, you’ll probably need the smallest model. However, if you live in a medium to large-size home and have higher demands, you’ll likely need one of the two higher-output models. 

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

ATAG’s iC Economiser Plus is a combi boiler, which means it doesn’t need a hot water storage cylinder or any tanks in your loft to deliver plenty of heating and hot water. It’s also a compact unit and ATAG even offers a model that’s small enough to fit inside a kitchen cupboard, so this boiler is a great option for homes where space is tight. If you like the look and sound of this space-saving combi boiler, then you just need to figure out which output (size) is best for you based on your heating and hot water requirements.

Choosing the right size combi boiler will ensure your home is always comfortable and you have enough hot water without wasting energy and money. We know how daunting it can be to pick the correct size, so be sure to ask a Gas Safe registered engineer to help you select the right model from the ATAG iC Economiser Plus Combi range.

Is it a High Efficiency Boiler?

Yep. This is an A-rated combi boiler that has been given the stamp of approval from the Energy Saving Trust, making it a great option if you’re looking for a high-efficiency replacement boiler for your home. The ATAG iC Economiser Plus Combi works by capturing waste energy from the flue gases and then uses this energy to pre-heat your water to improve hot water production efficiency. This, of course, means that the boiler can save both heat and money. What’s more, the boiler can be used with the ATAG OneZone smart controller to achieve a maximum A+ energy rating.

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

It does. The ATAG iC Economiser Plus Combi has intuitive controls to make it user-friendly and an LCD display that makes it easy for your engineer to view fault codes and get to the bottom of any boiler errors. It has built-in frost protection, as well as a built-in weather compensator to improve efficiency and ensure your home always stays at a comfortable temperature. The boiler also has an ATAG iCon stainless steel heat exchanger with a lifetime replacement guarantee and the boiler casing houses a built-in passive flue gas heat recovery device. 

How long is the Warranty on this Boiler?

Like all other ATAG boilers, the iC Economiser Plus Combi has a 10-year warranty as standard and a lifetime guarantee on the stainless steel heat exchanger. If you prefer, you can secure an extended 11-year warranty by purchasing the filter only pack with the boiler, a 12-year warranty with the water treatment pack or a 14-year warranty with the complete care pack which includes the OneZone smart controller.

Summary of Important Information

  • Expect to pay between £1,950 and £2,160
  • Heating output of 27kW, 35kW or 39kW
  • Hot water flow rates of 12.6, 16.1 or 17 litres per minute
  • Dimensions of 700mm (H) x 440mm (W) x 355mm (D)
  • A 275mm deep model is available to fit inside a kitchen cupboard
  • Uses gas as its fuel source
  • A-rated for efficiency
  • Compatible with smart controls
  • 10-year warranty as standard

Pros and Cons

ATAG combi boilers are highly rated units and this is backed up by the Energy Saving Trust product endorsement and the positive feedback from happy customers on Trustpilot. We also think the generous boiler warranty and the lifetime guarantee on the heat exchanger are big plus points too. There’s nothing not to like about the ATAG iC Economiser Plus Combi, so we’ve compiled a list of pros to help you decide if this boiler is right for you.  


  • Suited to small, medium and large-sized homes
  • Easy to install, use and service
  • Intuitive controls and LCD display
  • ATAG iCon stainless steel heat exchanger with a lifetime guarantee
  • Built-in frost protection and weather compensator
  • Built-in passive flue gas heat recovery device
  • Provides maximum energy efficiency – reduce fuel bills and carbon emissions
  • Compatible with the ATAG OneZone controller – improves efficiency and comfort
  • Excellent rating on Trustpilot – correct at time of writing in November 2020
  • 10-year warranty as standard
  • Warranty can be increased to 11, 12 or 14 years
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