TYPE 9SFN202 and 9SFN502: Renewable energy 1”1/2 and M45x2 immersion heaters

Main application: direct use of low voltage electricity produced by wind turbines or photovoltaic solar panels, for heating liquids, domestic hot water circuits, hot water tanks. These immersion heaters make it possible to use the surplus energy produced, and not used by domestic lighting needs or small electrical appliances. They can also be used in addition to domestic hot water tanks, limiting the need for electricity from the distribution network.

Heater tube material:  dia. 8mm heating elements in AISI 304 (AISI 316; AISI 321; Incolloy 800 or Incolloy 840 on request).

Fitting material: Brass, brazed on tubes. Supplied with one fiber gasket but without nut. See accessories below.

Thread: 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. (When the screw cap is pushed in, it is impossible to remove the cover)

Ingress protection class: IP66.

Cable gland: M20, PA66.

Thermowell:  Includes one stainless steel thermowell 7mm ID.

Heating elements connections: Terminals with M4 stainless steel screw, nut and stainless steel washer. Supplied with brass straps for switching the two low voltage heaters from 12V to 24V. (Changing their connection from parallel to serial)

Low voltage heating elements are identified by a red sleeve. 230V heating elements are identified by a black sleeve.

Not heating immersed zone: 50mm.

Surface load: see drawings

Voltage: 12 or 24V DC or AC and single phase 230V for models with auxiliary power heater

Attention: Switching by a thermostatic device the heating elements in low voltage must be made by device designed for low voltage use, and withstanding the important intensity of these circuits. Similarly, the section of the power cables must be adapted.


Main references

Fitting thread

1/2 BSPP M45 x 2
Power 2 x 150W 12V

+ 1 x 700W 230V

2 x 300W 12V

+ 1 x 1500W 230V

2 x 150W 12V

+ 1 x 700W 230V

2 x 300W 12V

+ 1 x 1500W 230V

Length (mm)

170 300 170


Surface load of 12/24V heating elements

3 w/cm² 6 w/cm² 3 w/cm²

6 w/cm²

Surface load of the 230V heating element

10 w/cm² 10 w/cm² 10 w/cm²

10 w/cm²

Reference in AISI 304

9SFN202152307217 9SFN202302615230 9SFN502152307217


Reference in Incolloy 800

9SFN202152307K17 9SFN202302615K30 9SFN202152307K30



2D&3D Drawing