The essential geometry of the horizontal elements and the large spaces for placing towels make STEP_B the most exclusive and elegant design product for the contemporary bathroom. Each component of the radiator is designed in every detail.

The images on this page have the sole purpose of depicting the product. Finishes and models may not have a perfect match with the actual product.

Step B, Hight 1240 mm, Lenght 600 mm, Satin Black Step B, Hight 1240 mm, Lenght 600 mm, Satin Black, (detail) Step B, Chrome-plated, (detail) Step B, Hight 1720 mm, Lenght 500 mm, Chrome-plated Step B, Hight 1720 mm, Lenght 500 mm, Chrome-plated Step B, Hight 1720 mm, Lenght 500 mm, Chrome-plated, Step B, 13 elements, Hight 1720 mm, Lenght 600 mm, Chrome-plated, (detail) Step B, Vertical, 11 elements, Hight 1240 mm, Lenght 500 mm, Chrome-plated, Step B, Vertical, 13 elements, Hight 1720 mm, Lenght 600 mm, Chrome-plated
Salvataggio in corso...

Configure your Step_B

Configure your Step_B

STEP_B_760_ 7 el.
STEP_B_1240_11 el.
STEP_B_1720_15 el.


Thermal power

Construction features

  • flattened pipes in aluminium, 40 mm height
  • maximum working pressure 4 bar
  • maximum working temperature 95°C

Model Depth (mm) Height (mm) Width (mm) Conn. centre (mm) Weight (kg) Capacity (lt) Exponent
STEP_B_760_ 7 el. 107,0 760 500 276 10,20 1,60 1.262,0 318,2 370,0 284,5 202,8 125,8 1,177
STEP_B_760_ 7 el. 107,0 760 600 376 10,80 1,90 1.436,0 362,1 421,0 325,7 234,0 146,8 1,150
STEP_B_1240_11 el. 107,0 1240 500 276 16,30 2,60 2.040,0 514,3 598,0 461,7 330,8 206,8 1,159
STEP_B_1240_11 el. 107,0 1240 600 376 17,30 3,10 2.228,0 561,6 653,0 504,8 362,2 226,8 1,154
STEP_B_1720_15 el. 107,0 1720 500 276 22,50 3,50 2.784,0 701,8 816,0 631,5 453,7 284,8 1,149
STEP_B_1720_15 el. 107,0 1720 600 376 23,90 4,20 3.190,0 804,1 935,0 721,6 516,7 322,7 1,161

(*) Thanks to the high performance of Irsap STEP_B radiators, the ideal Δt for low temperature projects is Δt at 30°C. The heating yields are calculated on products with epoxy powder coatings. For Chrome (code 50) finishes, the yields decrease respectively by 40%. All the available finishes are shown on the facing page.

For Δt different from 50°C use the formula: Q=Qn (∆t / 50)n

Standard equipment
  • wall fixing systems the same finish as the radiator
  • 2 hidden vent valves of 1/2” and valve caps
  • hydraulic connection kit in the same finish as the radiator, complete with couplings for copper fittings (diameter 12, 14 and 15 mm), and multilayer pipes (14 x 2 thick and 16 x 2 thick)

Type Description Document Downloads

Technical document


Catalog 2023 Catalog 2023


Color chart 2023 Color chart 2023

Installation Manual

709M0121 709M0121


1394M0323 1394M0323

Type Description Document Downloads

3D Model

STEP_B_L500_11EL STEP_B_L500_11EL

3D Model

STEP_B_L500_15EL STEP_B_L500_15EL

3D Model


3D Model

STEP_B_L600_11EL STEP_B_L600_11EL

3D Model

STEP_B_L600_15EL STEP_B_L600_15EL

3D Model


The Designer

Antonio Citterio

When a successful company like Irsap discovers the stylistic synthesis of Antonio Citterio, the result in terms of both aesthetics and performance is impeccable. Our meeting led to the development of a line of authentic design heating elements that speaks the immediately recognizable language of a designer who symbolizes Made in Italy spirit and production. These are products that can be easily inserted in any surroundings thanks to the discretion adopted in their physical configuration. Every single detail has a simple story and a truth to tell: fashion trends come and go without a trace, true design, instead, leaves its mark. Design remains at the disposal of anyone who designs interiors and those who desire to fill these rooms and areas with their own desires and dreams.

Antonio Citterio

Calculate the power

How to choose the Step_B radiator for your home? How to know what is the right power to heat each room? Online thermal requirement allows you to identify the most suitable radiator for your living space

discover the other radiators

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Do you need support?

See frequently asked questions in the dedicated area.


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If you would like to touch our products with your own hands, please visit our nearest showroom.