ATAG

Warranty

Warranty
Contact Us

Contact Us

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Complaints

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Products

Find your perfect boiler

Find your perfect boiler
iC Economiser combination

iC Economiser combination
iC Combination

iC Combination
iS System

iS System
iR Regular

iR Regular
Smart controls & thermostats

Smart controls & thermostats
Cylinders

Cylinders
Heat pumps

Heat pumps
Coming 2026

Electric boilers

Electric boilers
Coming 2026

Support & Advice

Support Hub

Support Hub
Product manuals

Product manuals
Troubleshooting

Troubleshooting
ATAG Zone app

ATAG Zone app
ATAG ONE Zone

ATAG ONE Zone
ATAG Cube

ATAG Cube
ATAG Roomstat

ATAG Roomstat
TADO v3

TADO v3
FAQs

FAQs
Winter boiler care

Winter boiler care
Radiators

Radiators
Image showing 3 cylinders

iSTEEL

indirect and direct cylinders

From rapid heat recovery to meeting high hot water demands, we have you covered with the iSteel cylinder range to ensure total comfort for your home.

iSteel Twin Coil unvented cylinders
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iSteel Indirect unvented cylinders
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iSteel Direct unvented cylinders
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High ErP rating - B rated

High ErP rating[1]

25 years warranty icon

Vessel warranty[2]

Duplex stainless steel icon

Built to last

image of an ATAG cylinder
iSteel Twin Coil
unvented cylinders
Perfect for multiple heat sources with fastest heat-up recovery
View the range
iSteel Indirect
unvented cylinders
Ultimate hot water on demand, with fast heat-up recovery
View the range
iSteel Direct
unvented cylinders
No gas boiler? No problem, with our electric home solution
View the range
High ErP rating - B ratedHigh ErP rating[1]
25 years warranty icon25 years vessel warranty[2]
Duplex stainless steel iconBuilt to last

[1] "B" rated on iSteel twin coil models 150L to 180L and Indirect 120L to 210L models. All other iSteel cylinders are "C" rated
[2] 25 years vessel and 2 years components warranty

Controls & thermostats

A great choice in control for your heating and hot water

image of a man using an ATAG Room Stat
ATAG OneZone

ONE Zone

Effortless smart heating control for ultimate comfort and reduced home energy bills.

Find out more

ATAG Cube

Cube controller

Straightforward, programmable digital thermostat for simple, reliable, and fuss-free heating control.

Find out more

ATAG Room Stat

Programmable room stat

Classic, user-friendly design with flexible seven-day scheduling for reliable home comfort.

Find out more