Step, Vertical, 6 elements, Hight 2000 mm, Lenght 670 mm, Ash Grey - Ral 7021


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

STEP_V is the range of “VERTICAL” products available in numerous sizes and heating powers. Nine models have been designed for the complete adaptability to every type of room and the satisfaction of every need. The extension of the range ensures ideal comfort in every situation.

Construction features

flattened pipes in aluminium, 70 mm height

maximum working pressure 4 bar

maximum working temperature 95°C


With STEP, IRSAP invites you to live your home to the fullest. The radiator blends into the surroundings, bringing comfort, elegance, and exclusivity, thanks to the high content of Made in Italy PURE INDUSTRIAL DESIGN.


The STEP range offers a synthesis of the clean and simple lines typical of the design by ANTONIO CITTERIO.

Colors and Finishes
Attention: the colors displayed are indicative and could not be as real radiators.
Model Deph  (mm) Height (mm) Width (mm) Conn. C. (mm) Weigth (kg) Capacity (lt) Δt=50°C (btu/h) Δt=50°C (kcal/h) Δt=50°C (Watt) Δt=40°C (Watt) Δt=30°C (Watt) Δt=20°C (Watt) Exponent
STEP_V_0600_06 el. 107,0 600 670 376 11,58 1,66 1.416,6357,0415,2315,6221,4134,41,232
STEP_V_0600_08 el. 107,0 600 910 376 15,62 2,22 1.888,8476,0553,6420,8295,2179,21,232
STEP_V_0600_10 el. 107,0 600 1150 376 19,65 2,79 2.361,0595,0692,0526,0369,0224,01,232
STEP_V_1800_04 el. 107,0 1800 430 1576 13,86 3,17 2.376,0598,8696,4528,8370,8224,81,234
STEP_V_1800_06 el. 107,0 1800 670 1576 21,05 4,77 3.564,0898,21.044,6793,2556,2337,21,234
STEP_V_1800_08 el. 107,0 1800 910 1576 28,25 6,37 4.752,01.197,61.392,81.057,6741,6449,61,234
STEP_V_2000_04 el. 107,0 2000 430 1776 14,91 3,51 2.609,2657,6764,8580,4406,4246,01,238
STEP_V_2000_06 el. 107,0 2000 670 1776 22,63 5,29 3.913,8986,41.147,2870,6609,6369,01,238
STEP_V_2000_08 el. 107,0 2000 910 1776 30,36 7,06 5.218,41.315,21.529,61.160,8812,8492,01,238

(*) Thanks to the high performance of Irsap STEP_V 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 • pre-mounted 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)


Installation Manuals


3D models


3D models


3D models


3D models


3D models


3D models


3D models


3D models


3D models

Catalogue 2022




Color chart 2022



Dimensional drawings