Quick answer: Both are high-quality ATAG combis with a stainless steel heat exchanger. Choose the iC for a dependable, compact combi, or the iC Economiser if you want to use less gas for hot water. If you have a hot water cylinder, the iS is the ATAG system boiler to look at.
ATAG boilers are designed and built in the Netherlands, with a stainless steel heat exchanger in every model. Here is how the iC, iS and iC Economiser compare.
At a glance
| iC | iS | iC Economiser | |
|---|---|---|---|
| Range | Popular combi | System | Premium combi |
| Boiler types | Combi | System | Combi |
| Guarantee when we fit it | Ask us for current terms | Ask us for current terms | Ask us for current terms |
| Best for | Homes with one main bathroom | Homes with more than one bathroom and a cylinder | Combi homes that want lower gas use for hot water |
| Stand-out feature | A stainless steel heat exchanger in a compact case | The system boiler version of the iC | Reuses heat from the flue to warm the incoming cold water |
ATAG iC
The ATAG iC is ATAG’s popular combi, with a stainless steel heat exchanger and a compact case that fits neatly into a kitchen cupboard.
ATAG iS
The ATAG iS is the system boiler version of the iC, made to work with a hot water cylinder in homes with more than one bathroom.
ATAG iC Economiser
The iC Economiser is ATAG’s top combi. It uses heat from the flue to warm the incoming cold water, so it needs less gas to make hot water.
Which ATAG boiler should you choose?
- Pick the iC if you want a well-built, compact combi for a home with one main bathroom.
- Pick the iC Economiser if you use a lot of hot water and want to cut the gas it takes to heat it.
- Pick the iS if you have, or want to keep, a hot water cylinder.
Not sure whether you need a combi, system or heat only boiler? Read our guide to combi vs system vs heat only boilers.
Frequently asked questions
What is the difference between the ATAG iC and iC Economiser?
Both are combis with a stainless steel heat exchanger. The iC Economiser adds a second heat exchanger that uses heat from the flue to pre-warm the incoming cold water, so it uses less gas for hot water.
Does ATAG make a system boiler?
Yes, the ATAG iS is the system boiler version of the iC, for homes with a hot water cylinder.
How long is the guarantee on an ATAG boiler?
ATAG offer long guarantees through their approved installer scheme. Ask us for the current terms on the model you are interested in.
Where are ATAG boilers made?
ATAG boilers are designed and built in the Netherlands.
Get the right boiler for your home
Tell us a little about your home and we will recommend the right type, size and model, then give you a clear quote. See our ATAG boilers. Browse all the boilers we install or get a boiler quote.
