Not registered yet? Take advantages of registration:
Products saving in a binding to the projects
Online consultation from experts

Privacy policy

Blauberg WKH 50x30-2

Duct water heater for rectangular ducts.
EAN codeEAN4058448032790
  • Description
  • Characteristics
  • Downloads
  • Designation key
  • Dimensions
  • Air pressure loss

For warming up of supply air in ventilation systems installed in various premises. Suitable for installation in supply or air handling units to warm up the supply air flow. For indoor use only if water serves as a heat carrier. For outdoor Features use antifreezing mixture (ethylene glycol solution). Compatible with 400×200 up to 1000×500 mm rectangular air ducts.


Galvanized steel case. Copper pipe manifold. Heat exchange surface made of aluminium plates. Equipped with a nipple for the system deaeration. Outlet header is equipped with a spigot for installation of an immersion temperature sensor or freezing protection mechanism. Available in two, three- or four-row tube modifications. Suitable for operation at maximum operating pressure 1.6 MPa (16 bar) and maximum transported air temperature +100 °C.


Fixing to rectangular ducts with flange connection. Any mounting position that ensures the heater deaeration. Install a filter upstream to the heater to protect heating elements against dirt ingress. Install the heater in front or behind the fan. In case of mounting behind the fan ensure the distance no less than 1–1.5 m for air flow stabilization and keep the maximum permissible air temperature inside the fan. Connect the heater on counter-flow basis, otherwise its capacity drops by 5–15 %. All the nomographic charts are rated for counter-flow connection. For correct and safe heater operation an automatic control and protection system is recommended, including the following functions:

  • regulation of the heating capacity and temperature of the air heated up;
  • filter clogging control by a differential air pressure sensor;
  • ventilation system start-up with pre-heated heater;
  • use of air dampers with a servo actuator with a return spring;
  • fan turning off in case of the heater freezing danger.

Connection against air flow


Connection along air flow

Parameter WKH 50x30-2 Measurement unit
Connected air duct size 500х300 mm
Number of water coil rows 2 -
Weight 11.5 kg
Casing material galvanized steel -
Air duct for rectangular air ducts -
Documents archieve
Documents archieve
Select a document type
  • Catalogues
  • Technical documentation
  • Certificates
WKH (rectangular) - data sheet (pdf 963.76Kb)
WKH (rectangular) - user's manual (pdf 984.3Kb)
WKH (rectangular) - image (png 751.31Kb)
Designation key
Designation key
Series Flange size (WxH) [cm]   Number of water (glycol) coil rows
WKH 40x20; 50x25; 50x30; 60x30; 60x35; 70x40; 80x50; 90x50; 100x50 2; 3; 4

Model Overall dimensions [mm]
B B1 B2 B3 H H1 H2 H3 L L1 L2 K
WKH 50x30-2 500 520 540 665 300 320 340 250 200 43 43 G 1”
Air pressure loss
Air pressure loss