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Blauberg ENH 150-1.7-1 S21

Duct heater for supply air re-heating.
EAN codeEAN4058448057304
  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Overall dimensions
  • Designation key
  • Compatibility chart

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 ENH 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 °С;
  • emergency overheat protection with manual reset at +90 °С.

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 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.

Parameter ENH 150-1.7-1 S21 Measurement unit
Power 1700 W
Total unit current 7.4 A
Minimum air capacity 160 m³/h
Insulating material incombustible mineral wool, 20 mm mm
Weight 2.3 kg
Casing material galvanized steel -
Air duct for round air ducts -
Connection diameter 150 mm
Capacity diagram
Capacity diagram
  • Selection method:
  • Air capacity:
  • Pressure:
Operating point
  • Air capacity: --
  • Pressure: ---
Documents archieve
Documents archieve
ENH (round) - data sheet (pdf 625.77Kb)
ENH (round) - image (png 273.34Kb)
S21 - user's manual (pdf 2.21Mb)
Modbus table for connecting S21 automation to BMS - user's manual (pdf 140.84Kb)
Overall dimensions
Overall dimensions

Model Overall dimensions [mm]
D B H L L1
ENH 150-1.7-1 S21 149 170 282 306 190
Designation key
Designation key
Serie Connected air duct diameter [mm]   Heater power [kW]   Number of phases Compatability with automation
ENH 125; 150; 160; 200 0.6; 0.8; 1.2; 1.7; 2.0 1: single-phase S21: compatible with S21 automation
Compatibility chart
Compatibility chart
Heater model Unit model
ENH 150 S21 KOMFORT unit with a Ø 150 mm spigot and S21 automation