Type 9SU831:Standard liquids heaters,140 mm diameter, hairpin tubular heaters, With built-in tubular heat exchanger
Type 9SU831
Diameter (mm) 140
Tank length (mm) 313
Mounting Vertical or horizontal
Tubular heaters Qty 3 or 6
Maximum power 4,5kw (3 x 1,5 kW, 5W/cm²)
9 kw (3 x 3 kW, 10W/cm²) 


Diameter of the heaters: 10mm

Tubular heaters material: 316L (Incolloy 800 optional)

Quantity of tubular heaters: 3

Body material: 304L stainless steel (316L optional)

Material fittings: 304L stainless steel (316L optional)

Inlet connection: Male 1″1/2 BSPP cylindrical (1″1/4 optional)

Outlet diameter: Male 1″1/2 BSPP cylindrical (1″1/4 optional)

Air vent thread: 3/8 BSPP (on models where it exists)

Tubular heat exchanger: dia. 10 x 8.6mm 316L stainless steel tube, heat exchange surface 4000 cm²

Thermowell (1): 304L stainless steel dia. 10×8.5 mm, length 260 mm for thermal cut-out (See thermal cut-out sub assembly models at end of this catalog). Copper thermowell is available on request.  This thermowell can also be used for a thermostat bulb or a temperature sensor.

Disc thermostat mounting bracket (2): 1 bracket for thermostat with extended cup (see thermostat models at the end of catalog).

Wall mounting brackets (3): 3 x 2 M5 feet, 170mm center line distance, for wall mounting on 3 different sides. M5 brackets that are not used for wall mountings can be used for grounding.

Accessories: see end of catalog


2D&3D Drawing

Standard products, 304L stainless steel tanks, hairpin 316L sheathed heaters,

SUS 316L tubular heat exchanger, 1”1/2 fittings

References Style Surface load (W/cm²) Heating elements dia. Qty of heating elements Voltage Power


9SU831C690Y22E00 C 10 10 3 230-400 3 x 3
9SU831C645Y22E00 C 5 10 3 230-400 3 x 1.5
9SU831D690Y22000 D 10 10 3 230-400 3 x 3
9SU831D645Y22000 D 5 10 3 230-400 3 x 1.5
9SU831F690Y22000 F 10 10 3 230-400 3 x 3
9SU831F645Y22000 F 5 10 3 230-400 3 x 1.5

Power values are the maximum possible power for a given surface load. It is possible to reduce the power by reducing the surface load.