Trustpilot

ATAG iSteel Unvented Cylinders

The iSteel unvented cylinders range from 90 to 300 litres. They work with ATAG iS system and iR regular boilers.

Installation and servicing

Key features and benefits

  • Rapid heat up recovery
  • Rated ‘B’ for energy efficiency
  • Compliant with part ‘L’ of the building regulations – conservation of fuel and power
  • A 25 year warranty
  • A 2 year warranty on cylinder components

Specification

The table represents the technical information for the cylinder part number.

PART NUMBER CY500090 CY500120 CY500150 CY500180 CY500210 CY500250 CY500300
CAPACITY (LTRS) 90 120 150 180 210 250 300
HEIGHT(MM) 760 940 1140 1320 1510 1720 1980
DIAMETER(MM) 545 545 545 545 545 595 595
WEIGHT EMPTY(KG) 23 27 31 35 39 48 55
WEIGHT FULL (KG) 111 145 179 213 247 296 352
INDIRECT REHEAT (MINS) 12 16 17 20 22 25 34
IMMERSION REHEAT (MINS) 53 80 106 136 167 213 385
HEAT EXCHANGER (KW) 16.46 16.46 18.55 18.55 18.55 22 22
STANDING LOSS (KWH/DAY) 0.96 1.11 1.26 1.40 1.54 1.76 2.03
COLD INLET 195 195 195 195 195 195 195
IMMERSION 1 345 345 340 340 365 365 365
IMMERSION 2 – – – – – 965 980
SEC. RETURN – – – – 1160 1410 1605
T&P VALVE 525 710 890 1085 1265
1

Boilers

ATAG boilers are efficient, reliable and easy to install.

Find out more
2

Not sure which boiler you need?

Our boiler finder will help you to choose the perfect boiler for your home.

Find your perfect boiler
3

Controllers

We have a range of controllers to suit different requirements

View all Controllers

Installers that you can depend on

From design through to installation and after-care service, our ATAG selected gas-safe installers are on hand to offer you excellent advice and the best solution possible that suits your needs.

Find an Installer