Heating Equipment
Immersion Heaters
Type 9ST4 - Immersion heater with 78mm × 78mm × 74mm aluminum enclosure. 1"1/4, 1"1/2, M45x2 fittings. With or without thermostat.

Type 9ST4 - Immersion heater with 78mm × 78mm × 74mm aluminum enclosure. 1"1/4, 1"1/2, M45x2 fittings. With or without thermostat.

Heating Equipment
Immersion Heaters
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Main applications

Liquid heating, hot water circuits, containers and buffer tanks.

These heaters are the smallest size with aluminum enclosure that can receive an adjustable thermostat. But there is not enough room inside to add a connection block.

Therefore, models with thermostats are supplied wired with a 2 meters long rubber insulated cable, 3 × 1.5mm².

They exist in:

- 6 standard power levels: 1kW – 1.5kW - 2kW - 3kW - 4kW - 6kW.

(4 and 6kW version does not exist with thermostat).

- 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 available on request.

Enclosure: 78 × 78 × 74mm, 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 glands and M25 metal plug).

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

Thermowell: They are supplied in standard with one thermowell in AISI304, dia.8 × 7mm, 135mm length, also included on heaters. Supplied without thermostat.

Heating element connections: Terminals with stainless steel screw, nut and stainless steel washer. Switching straps on 3 phases models.

Models with thermostats are made with a wired-in power cord, length 2m.

Temperature control: Models with thermostats can be set from 30 to 90°C (85-195°F). Thermostat knob access is under a M25 cap. External knob on request. Other temperature ranges on request. Models with thermostat are made only in single phase and for power up to 3kW only.

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

Not heating immersed zone: 50mm.

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

Voltage: 220-240V single phase or three phases 380-400V (Star connection with neutral). 3 phases version cannot be made with a thermostat.

Variants on request:

- One or 2 heating elements only.

- 4-40°C (40-105°F), 0-60°C (32-140°F), or 30-110°C (86-230°F) thermostat.

- Manual reset thermostat.

- One or two pilot lights.

Options: see last section of catalogue N°22

  • Nuts
  • Gaskets

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