iSteel Unvented Cylinders

For homes that need lots of hot water High efficiency, quick recovery coils help deliver all the hot water a family needs – with superior
insulation properties keeping heat loss levels down to a minimum. Direct and indirect cylinders, from 90-300 litre capacity.

Product manual Ask a question

Key features

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

Specifications

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

Scroll to view more information

CAPACITY (LTRS)

90

HEIGHT(MM)

760

DIAMETER(MM)

545

WEIGHT EMPTY(KG)

23

WEIGHT FULL(KG)

111

INDIRECT REHEAT (MINS)

12

IMMERSION REHEAT (MINS)

53

HEAT EXCHANGER (KW)

16.46

STANDING LOSS (KWH/DAY)

0.96

COLD INLET

195

IMMERSION 1

345

IMMERSION 2

-

SEC. RETURN

-

T&P

525

Scroll to view more information

CAPACITY (LTRS)

120

HEIGHT(MM)

940

DIAMETER(MM)

545

WEIGHT EMPTY(KG)

27

WEIGHT FULL(KG)

145

INDIRECT REHEAT (MINS)

16

IMMERSION REHEAT (MINS)

80

HEAT EXCHANGER (KW)

16.46

STANDING LOSS (KWH/DAY)

1.11

COLD INLET

195

IMMERSION 1

345

IMMERSION 2

-

SEC. RETURN

-

T&P

710

Scroll to view more information

CAPACITY (LTRS)

150

HEIGHT(MM)

1140

DIAMETER(MM)

545

WEIGHT EMPTY(KG)

31

WEIGHT FULL(KG)

179

INDIRECT REHEAT (MINS)

17

IMMERSION REHEAT (MINS)

106

HEAT EXCHANGER (KW)

18.55

STANDING LOSS (KWH/DAY)

1.26

COLD INLET

195

IMMERSION 1

340

IMMERSION 2

-

SEC. RETURN

-

T&P

890

Scroll to view more information

CAPACITY (LTRS)

180

HEIGHT(MM)

1320

DIAMETER(MM)

545

WEIGHT EMPTY(KG)

35

WEIGHT FULL(KG)

213

INDIRECT REHEAT (MINS)

20

IMMERSION REHEAT (MINS)

136

HEAT EXCHANGER (KW)

18.55

STANDING LOSS (KWH/DAY)

1.40

COLD INLET

195

IMMERSION 1

340

IMMERSION 2

-

SEC. RETURN

-

T&P

1085

Scroll to view more information

CAPACITY (LTRS)

210

HEIGHT(MM)

1510

DIAMETER(MM)

545

WEIGHT EMPTY(KG)

39

WEIGHT FULL(KG)

247

INDIRECT REHEAT (MINS)

22

IMMERSION REHEAT (MINS)

167

HEAT EXCHANGER (KW)

18.55

STANDING LOSS (KWH/DAY)

1.54

COLD INLET

195

IMMERSION 1

365

IMMERSION 2

-

SEC. RETURN

1160

T&P

1265

Scroll to view more information

CAPACITY (LTRS)

250

HEIGHT(MM)

1720

DIAMETER(MM)

595

WEIGHT EMPTY(KG)

48

WEIGHT FULL(KG)

296

INDIRECT REHEAT (MINS)

25

IMMERSION REHEAT (MINS)

213

HEAT EXCHANGER (KW)

22

STANDING LOSS (KWH/DAY)

1.76

COLD INLET

195

IMMERSION 1

365

IMMERSION 2

965

SEC. RETURN

1410

T&P

1520

Scroll to view more information

CAPACITY (LTRS)

300

HEIGHT(MM)

1980

DIAMETER(MM)

595

WEIGHT EMPTY(KG)

55

WEIGHT FULL(KG)

352

INDIRECT REHEAT (MINS)

34

IMMERSION REHEAT (MINS)

385

HEAT EXCHANGER (KW)

22

STANDING LOSS (KWH/DAY)

2.03

COLD INLET

195

IMMERSION 1

365

IMMERSION 2

980

SEC. RETURN

1605

T&P

1780

RF ATAG boiler NOV 2017 AW copy 2

ATAG Boilers

ATAG boilers are efficient, reliable and easy to install. Take a look at our full range.

Find out more
Flyer Water Treatment Pack-1

Chemicals and filters

We have a range of chemicals and filters that can be used with our boilers.

View all chemicals and filters
OneZone (3)

OneZone Smart Heating Controller

Control the temperature in your home remotely using the ATAG One Zone App, available for FREE on the App Store or Google Play.

View the OneZone

Interested in becoming a ATAG Selected Partner?

If you're interested in becoming a ATAG Selected Partner, simply click on the button below to submit your form. If you'd like more information about our boilers, why not book a demo below?

Become a registered installer     Book a product demo