Electric boilers series SB, 180 - 300 kW

SB 180 - 300 kW

Medium size series of Varmeteknikk's ridgid and reliable element boilers

180-300 kW are delivered for 3-phase power connection in 3x230V, 3x400 V or 3x690 V. Other voltages may be delivered on request.

The regulator/controller is very user friendly, and regulates the power in 15 steps.

An optional outdoor sensor is avalable for optimized economical operation. The boiler output temperature is then compensated for the outdoor teperature according to a heat curve.

The boilers have digital and analogue in- and outputs for external control an monitoring, so that they may be visulized and controllerfrom the customers SCADA system. Optionally bus couplers may be delivered preinstalled for MODbus or BACnet communication.
The boilers may normally also be controlled directly from a heat pump.

Varmeteknikk boilers are delivered with standard DN100 - PN16 flanges.



Varmeteknikk AS panel til en av elektrokjelene

Design data

Design pressure6 bar
Design temperature110 °C
Max operational temperature100 °C
Water volume240 l
Min. flow0,9 l/s,  3,2 m3/h
Max flow13,9 l/s,  50 m3/h

Hydraulic connection

Connection typeFlange DN100 - PN16
Connection sideRear
Drain and expansion/ventG 1 1/2"

Regulation data

Temperature range5 - 100 °C
Regulation steps15
Steptime up1-250 s
Steptime down1-20 s
Regulation typePI 


The boilers may also be delivered with connection box on left side.

Power connection

No. of connection boxes1
Connection sideRight (standard)
Left (option)
No. of cables each box3
No. of terminals each phase3
Cable cross section35 - 240 mm2
Max terminal current

380 A Al - 425 A Cu



Control voltage

Voltage230 Vac - 50 Hz
Amperage10 A
Internal fuseØ5x20 mm, 10 A


Signals for external control


Control signals 
Start/stopExternal potential free closing contact
Temp. setpoint0-10 Vdc = 0-100 °C
Max step/power0-10 Vdc = 0-15 steps
OperationInternal potential free closing contact
AlarmInternal potential free changeover contact
Setpoint0-10 Vdc = 0-100 °C
Temp.0-10 Vdc = 0-100 °C
Step/power0-10 Vdc = 0-15 steps

All dimensions in mm.

Techical data

TypeNRF no.Power

3 x 230 V

Current (A)

3 x 400 V

Current (A)

3 x 690 V
Current (A)
Net weight
SB 21808205355180452--290
SB 22008205356200502--295
SB 22258205357225565--314
SB 22508205358250628--315
SB 23008205359300753--310
SB 41808205367180-260-290
SB 42008205368200-289-295
SB 42258205369225-325-314
SB 42508205371250-361-315
SB 43008205372300-433-310
SB 6180-180--151290
SB 6200-200--167295
SB 6225-


SB 6250-250--209315
SB 6300-300--251310


Outdoor sensor

Outdoor sensor for temperature compensated heatcurve regulation.
Dim. 60x60x30 mm.
Connection 2-core min. 0,5 mm2. Max length 50 m.


Transfers all the standard digital and analoug signals to desired protocol MODbus TCP, MODbus RTU (RS485) or BACnet IP (different bus couplers).