Atag iS System Boilers

When only the best will do

Selected Atag Heating Technology Partner

iS System Boilers from Atag: Europe's Most Energy Efficient System Boilers

Atag iS System Boiler with Atag Comfort Pack

Atag iS system boilers have been designed to exceed European energy efficiency legislation, often more stringent than in the UK. Atag boilers are the most energy efficient boilers available in Europe & have the lowest running costs of any combi boiler.

With an Atag iS system boiler you’ll be choosing one of the most energy efficient boilers in Europe. It is not only easy to operate, but also has an in-built ErP pump which controls the heat given out by the boiler to increase energy efficiency and help lower energy bills.

The innovative and patented Economiser Plus feature harnesses residual heat left in the waste flue gases when the boiler is used for hot water, capturing the waste energy and using it to pre-heat the mains water to improve hot water production efficiency, saving both heat and money in the process.

Atag boilers have been awarded the prestigious Best Boiler Award in the Netherlands in multiple years & have the highest score of any boiler manufacturer on Trust Pilot, the independent review site.

Atag iS system boilers are available in the following sizes:

  • 15kW suitable for 1 or 2 bedroom properties
  • 18kW suitable for 2 to 3 bedroom properties
  • 24kW suitable for 3 to 4 bedrooms properties
  • 32kW suitable for 4 to 5 bedroom properties
  • 40kW suitable for the largest of properties

With an Atag iS system boiler you’ll be choosing one of the most energy efficient boilers in Europe. It is not only easy to operate, but also has an in-built ErP pump which controls the heat given out by the boiler to increase energy efficiency and help lower energy bills.

The innovative and patented Economiser Plus feature harnesses residual heat left in the waste flue gases when the boiler is used for hot water, capturing the waste energy and using it to pre-heat the mains water to improve hot water production efficiency, saving both heat and money in the process.

Atag boilers have been awarded the prestigious Best Boiler Award in the Netherlands in multiple years & have the highest score of any boiler manufacturer on Trust Pilot, the independent review site.

Atag iS system boilers are available in the following sizes:

  • 15kW suitable for 1 or 2 bedroom properties
  • 18kW suitable for 2 to 3 bedroom properties
  • 24kW suitable for 3 to 4 bedrooms properties
  • 32kW suitable for 4 to 5 bedroom properties
  • 40kW suitable for the largest of properties
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Atag iS System Boiler with Atag Comfort Pack

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Why Choose Us?

99% Customer Satisfaction

You can rest assured that you are making the right choice when choosing our company to install your new boiler because we are one of only a few companies in the region that have an independently verified customer satisfaction score in excess of 99%.

Lowest Prices in the UK

We buy and install more boilers than any other independent heating company in the region. This has enabled us to negotiate exclusively low prices with the manufacturers, which we share with all our customers.

COVID-Secure Contractor

We have carried out a COVID-19 risk assessment to keep our customers and engineers safe. We have comprehensive PPE, cleaning, handwashing and hygiene procedures in place, and will take all reasonable steps to maintain social distancing at all times. 

Price-Match Promise

We guarantee we will not be beaten on price. In the unlikely event that you receive a lower quote from any other Gas Safe registered installer, we will match their quote and provide you with your first year service free of charge.

COVID-Secure Contractor

We have carried out a COVID-19 risk assessment to keep our customers and engineers safe. We have comprehensive PPE, cleaning, handwashing and hygiene procedures in place, and will take all reasonable steps to maintain social distancing at all times. 

Price-Match Promise

We guarantee we will not be beaten on price. In the unlikely event that you receive a lower quote from any other Gas Safe registered installer, we will match their quote and provide you with your first year service free of charge.