Type: 9ST2. Immersion heater with round enclosure, dia. 58 x 75mm. 1"1/4, 1"1/2, M45x2 fittings.

Main applications: liquid heating, hot water circuits, containers and buffer tanks.

These immersion heaters are the smallest with connection box and 3 heating elements. They have been designed with a built-in connection block for easier wiring. Their small size does not allow having a thermostat inside. 

They exist in:

– 5 standard power levels: 1 kW – 1,5 kW – 2 kW – 3 kW – 4 kW.

– 3 types of standard fittings: 1″1/4, 1″1/2 and M45x2.

– 2 types of surface load density: 5W/cm² and 10W/cm². See technical introduction to optimize the surface load.


Heater tube material: 3 heating elements dia. 8mm dia. AISI 304 or Incolloy 800 (AISI 316; AISI 321; Incolloy 825 on request).

Fitting material: Brass, not swiveling, brazed on tubes. (AISI 304 or AISI 316, TIG welded, or brazed, models are available on request). Supplied without gasket and without nut. See accessories below.

Thread: 1″1/4, 1″1/2 BSPP (ISO 228) and Metric thread M45x2.

Enclosure: dia. 58mm x 75 mm, black PA66 fiber glass reinforced, with gasket. Opening by center M4 screw without access to end user.

Ingress protection class: IP54.

Cable gland: M20, PA66. Nickel-plated brass on request.

Thermowell: On request.

Heating element connections: Terminals with stainless steel screw, nut and stainless steel washer. Switching straps for single phase/ 3 phases.

Heating elements are connected on a built-in 5 ways connection block, for wires up to 2.5mm².

Support grid: 1 grid AISI 304 for lengths from 400 to 600mm, 2 grids above.

Not heating immersed zone: 50mm.

Surface load: standard 5 W/cm² or 10 W/cm², other values on request.

Voltage: 220-240V single phase or three phase 380-400V (Star connection with neutral).

Variants on request:

Only one or only 2 heating elements.

– M45x2 brass fitting.

Electric Wiring


2D&3D Drawing

Main references

5W/cm², 1″1/2* brass fitting

Power 1kW 1.5kW 2kW 3kW 4kW
Length (mm) 170 240 300 440 570
Reference in AISI 304 9ST2A5E0010U8170 9ST2A5E0015U8240 9ST2A5E0020U8300 9ST2A5E0030U8440 9ST2A5E0040U8570
Reference in Incolloy 800 9ST2A5E0010UK170 9ST2A5E0015UK240 9ST2A5E0020UK300 9ST2A5E0030UK440 9ST2A5E0040UK570


10W/cm², 1″1/2* brass fitting

Power 1kW** 1.5kW 2kW 3kW 4kW
Length (mm) 135 135 170 240 300
Reference in AISI 304 9ST2A5E0010BK130 9ST2A5E0015U8130 9ST2A5E0020U8170 9ST2A5E0030U8240 9ST2A5E0040U8300
Reference in Incolloy 800 9ST2A5E0010BK130 9ST2A5E0015UK130 9ST2A5E0020UK170 9ST2A5E0030UK240 9ST2A5E0040UK300

* 1″1/4 brass fitting instead of 1″1/2, replace A5 by A4 in the reference. M45x2 brass fitting instead of 1″1/2, replace A5 by A9 in the reference.

** This model has only 2 heating elements.


References of accessories in option (not included in the product, must be ordered separately):



Other accessories and drawings: see last section of this catalogue.