Type: 9ST3. Immersion heater with 78mm x 66mm x 50mm aluminum enclosure. 1"1/4, 1"1/2, M45x2 fittings.

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

These immersions heaters are the smallest with 3 heating elements and aluminum enclosure. There is not enough room inside for thermostat.

They do not have a built-in connection block.

They exist in:

– 6 standard power levels: 1 kW – 1.5 kW – 2 kW – 3 kW – 4 kW – 6 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: 8mm dia. AISI 304 or Incolloy 800 (AISI 316; AISI 321; Incolloy 825 on request).

Fitting material: brass, swiveling on housing, 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: 78 x 66 x 50 mm, die-cast aluminum, 3mm wall thickness. Silicone foam gasket. Stainless steel cover screws with locking nuts, 2 inner earth terminals M4; Gray epoxy paint RAL7035. Protected against galvanic corrosion.

Ingress protection class: Water and dust: IP65; shock resistance: IK 10 (with metal cable gland).

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

Thermowell: On request.

Heating elements connections: terminals with stainless steel screw, nut and stainless steel washer. Switching straps on 3 phase models.

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, others values on request.

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

Variants on request: TCO inside dia. 10 mm pocket, at center of heating elements. (MOQ apply).


Electric Wiring


2D&3D Drawing

Main references


5W/cm², 1″1/2* brass fitting.

Power 1kW 1.5kW 2kW 3kW 4kW 6kW
Length (mm) 170 240 300 440 570 840
AISI 304 Reference 9ST3G5E0010U8170 9ST3G5E0015U8240 9ST3G5E0020U8300 9ST3G5E0030U8440 9ST3G5E0040U8570 9ST3G5E0060U8840
Incolloy 800 reference 9ST3G5E0010UK170 9ST3G5E0015UK240 9ST3G5E0020UK300 9ST3G5E0030UK440 9ST3G5E0040UK570 9ST3G5E0060UK840


10W/cm², 1″1/2* brass fitting.

Power 1kW** 1.5kW 2kW 3kW 4kW 6kW
Length (mm) 135 135 170 240 300 440
AISI 304 Reference 9ST3G5E0010B8130 9ST3G5E0015U8130 9ST3G5E0020U8170 9ST3G5E0030U8240 9ST3G5E0040U8300 9ST3G5E0060U8440
Incolloy 800 reference 9ST3G5E0010BK130 9ST3G5E0015UK130 9ST3G5E0020UK170 9ST3G5E0030UK240 9ST3G5E0040UK300 9ST3G5E0060UK440

* 1″1/4 brass fitting instead of 1″1/2, replace G5 by G4 in the reference. M45x2 brass fitting instead of 1″1/2, replace G5 by G9 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.