Electric boilers series MB, 35 - 150 kW

MB 35 - 150 kW

The smallest series of Varmeteknikk's ridgid and reliable element boilers

35-150 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 7 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 MB boilers are delivered with standard DN65 - PN16 flanges.



Varmeteknikk AS panel til en av elektrokjelene

Design data

Design pressure6 bar
Design temperature110 °C
Max operational temperature100 °C
Connection typeFlange DN65 - PN16
Connection sideRear
Drain and expansion/ventG 1"
Water volume75 l
Min. flow0,2 l/s,  0,72 m3/h
Max flow6 l/s,  22 m3/h

Hydraulic connection

Connection typeFlange DN65 - PN16
Connection sideRear
Drain and expansion/ventG 1"

Regulation data

Temperature range5 - 100 °C
Regulation steps7
Steptime up1-250 s
Steptime down1-20 s
Regulation typePI 


Power connection

No. of connection boxes-
Connetion sideUnder - sides
No. of cables each box-
No. of terminals each phase1-2 hook-on clamps/shoes
(not supplied)
Cable cross section35 - 240 mm2
Max terminal current




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 = 0-7 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 = 0-7 steps

All dimensions in mm.

Technical data

TypeNRF no.Power

3 x 230 V

Current (A)

3 x 400 V

Current (A)

3 x 690 V
Current (A)
Net weight
MB 203582053353588--130
MB 2045820533645113--130
MB 2060820533760151--135
MB 2075820533875188--135
MB 2090820533990226--140
MB 21058205341105264--140
MB 21208205342120301--145
MB 21408205343140351--145
MB 21508205344150377--150
MB 4035820534535-51-130
MB 4045820534645-65-130
MB 4060820534760-87-135
MB 40758205348


MB 4090820534990-130-140
MB 41058205351105-152-140
MB 41208205352120-173-145
MB 41408205353140-202-145
MB 41508205354150-217-150
MB 6035 35--29130
MB 6045 45--38130
MB 6060 60--50135
MB 6075 75--63135
MB 6090 90--75140
MB 6105 105--88140
MB 6120 120--100145
MB 6140 140--117145
MB 6150 150--126150


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).