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NKD Series

NKD Series

Duct heater for supply air postheating with external control.

Products in this series (9)

Series   Connected air duct diameter
  Heater power [kW]   Phase
NKD   125; 160; 200   0,6; 0,8; 1,2; 1,7; 2,0   1 - single-phase

The heater is designed for integration into a ventilation system and joint operation with an air handling unit equipped with a control system used to switch on the heater and control its operation. The heater maintains the supply duct air temperature at a point set by the unit controller.


The casing, the junction box and the heater cover are made of galvanized steel with the heating elements in stainless steel.

The heater casing is additionally heat-insulated with 20 mm non-flammable mineral wool layer. The heaters are equipped with rubber seals for airtight connection to the air ducts.

The NKD duct heaters are equipped with a power and a signal cable for connection of the heater to the air handling unit controller.

The temperature is controlled by a triac power controller by means of switching the full load on and off. Load commutation is carried out by the semiconductor device (triac). The heaters are equipped with overheat thermostats:

  • main overheat protection with automatic reset at +50 °C
  • emergency overheat protection with manual reset at +90 °C

The heater design ensures its mounting on the round ducts in any position by means of clamps (included in delivery).

The air flow direction shall match the direction of the arrow on the heater casing.

The heater is connected to the air handling unit controller using the cable with connectors.

In case of horizontal mounting the control box must be installed with the cover upwards.

Swivel range from the normal position up to max. 90°. Do not install the control box with the cover downwards.

Compatibility chart:
Heater model (connected air duct diameter) Unit model
NKD 125 VUT 160 V EC A19
VUE 160 V EC A19
VUT 160 VB EC A19
VUE 160 VB EC A19
VUT 160 V1 EC A19
VUE 160 V1 EC A19
VUT 160 V1B EC A19
VUE 160 V1B EC A19
NKD 160 VUT 300 V2B EC A19
VUE 300 V2B EC A19
VUT 350 V1B EC A19
VUE 350 V1B EC A19
VUT 350 VB EC A19
VUE 350 VB EC A19
NKD 200 VUT 550 V2B EC A19
VUE 550 V2B EC A19
VUT 550 VB EC A19
VUE 550 VB EC A19


Please, feel free to contact us.


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+380 44 406 36 25

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  • Selection method:
  • Performance:
  • Pressure:
NKD 125-0.6-1
NKD 125-0.8-1
NKD 125-1.2-1
NKD 160-1.2-1
NKD 160-1.7-1
NKD 160-2.0-1
NKD 200-1.2-1
NKD 200-1.7-1
NKD 200-2.0-1