iC Economiser 27 Plus


iC Economiser 27 Plus  kW – 12.6 litres flow rate per minute.

Our iC Economiser Plus has been described as the combi of the future because it contains an industry leading innovation – our patented Economiser.

Some years ago our design engineers realised there was untapped residual heat left in the boiler after hot water had been heated. Rather than release this energy as waste, they engineered the Economiser, an environmentally friendly innovation that recycles the flue gases for a second time, resulting in optimum energy efficiency.

For complete flexibility, pair the ATAG iC Economiser Plus combination boiler with the ATAG ONE Zone controller to achieve a maximum A+ Energy-Related products rating.

  • Compact dimensions (mm) h700 X w440 X d355
  • A 275 mm (deep) model is available to fit inside kitchen cupboards
  • Standard 10 year warranty
  • Powered by the unique iCon heat exchanger with a lifetime replacement guarantee
  • Instant hot water with pre-heat facility
  • Built in Passive Flue Gas Heat Recovery Device
  • Comes with an outside weather compensator as standard
  • Achieves ErP ‘A’ rating for heating and hot water
  • Savings of up to £40 a year on hot water and up to £320 off energy bills (Energy Saving Trust, April 2017).
  • Completely user friendly

Technical Specifications

ATAG iC Economiser Plus 27
Part Number BE200327
ErP Seasonal space heating energy efficiency class A
ErP Seasonal space heating energy efficiency (%) 94
ErP Water heating energy efficiency class A
ErP Water heating energy efficiency (%) 94
Erp Declared load profile DHW XXL
DHW input kW 29.8
CH output kW 23.2
Flow rate @ 35°C rise l/min 12.6
SEDBUK 2009 (%) 89.7
Dimensions (H x W x D) mm 700x440x355
Boiler lift weight with jig Kg 43
Standard Warranty (years) 10
LPG conversion kit available Yes
NOx class 6
Ingress Protection (IP) IPX4D
Maximum equivalent horizontal flue length (m) 60/100mm 15
Maximum equivalent vertical flue length (m) 60/100mm 15
Maximum equivalent horizontal flue length (m) 80/125mm 50
Maximum equivalent vertical flue length (m) 80/125mm 50

Inside the boiler


  1. Gas Valve
  2. Three way diverter valve
  3. ATAG iCon heat exchanger
  4. Modulating pump
  5. PCB Boiler control unit
  6. Economiser PFGHRD

How it works


How it works
The ATAG iC Economiser Plus works by capturing waste energy from the flue gases and uses it to pre-heat the mains water to improve hot water production efficiency, saving both heat and money in the process.



Find out what type of boiler you have
"Best decision I made in having it installed. Works efficiently for my family and our requirements"
Mrs Simmons St Albans, Herts