Water air heater

WHP 25-22

Article number: 0082.0112
Manufacturer: MAICO
Water-air heater for 500 mm x 300 mm ventilation channels
WHP 25-22 IM0009861.PNG Water-air heater for 500 mm x 300 mm ventilation channels

Characteristic curve

WHP 25-22 - Characteristic curve Pressure losses

  • WHP 25-22 IM0001039.PNG Water-air heater for 500 mm x 300 mm ventilation channels
  1. WHP 22-18
  2. WHP 25-22
  3. WHP 28-29
  4. WHP 31-34
  5. WHP 35-43
  6. WHP 50-55
  7. WHP 56-69

WHP 25-22 - Characteristic curve

  • WHP 25-22 IM0001040.PNG Water-air heater for 500 mm x 300 mm ventilation channels

Dimensioned drawing

WHP 25-22 - Dimensioned drawing [mm]

  • WHP 25-22 IM0001041.PNG Water-air heater for 500 mm x 300 mm ventilation channels
  1. Whitworth thread: 1/2" for WHP 22-18 and WHP 25-22; 3/4" for WHP 28-29, WHP 31-34 and WHP 35-43; 1" for WHP 50-55 and WHP 56-69
A: 500 mm
B: 300 mm
C: 520 mm
D: 320 mm
E: 322 mm
F: 16 mm
G: 20 mm
H: 645 mm
I: 25 mm
K: 35 mm
L: 110 mm

Technical data

WHP 25-22 - Technical data

Article WHP 25-22
Max. flow velocity 3,5 m/s
Installation site Channel
Installation position vertical / horizontal
Housing material Sheet steel, galvanised
Weight 4,8 kg
Channel dimension 500 mm x 300 mm
Width 645 mm
Height 370 mm
Depth 110 mm
Air heater type Water
Heater power rating 21.700 W
Mass flow 936 kg/h
Inlet temperature 70 °C
Return flow temperature 50 °C
Max. water temperature 100 °C
Max. water pressure 8 bar
Water pressure difference 10.000 Pa
Packing unit 1 piece
Range D
GTIN (EAN) 4012799821120
Article number 0082.0112

Accessories of

WHP 25-22 - Accessories of

is a general accessory of

Product typeNameArt. No.Price*(EUR)Action
Channel fanEPK, DPK 500 x 300 channel fans---

Product description


WHP 25-22

short description

Water-air heater for 500 mm x 300 mm ventilation channels

Product description

  • Water air heater for ventilation systems.
  • Water connection made of copper tubes with external threads.
  • Mounting instructions: Install behind the fan at distances of at least 1 metre, to achieve equal flows.
  • With air extraction and emptying. Take accessibility into account when installing.
  • Frost protection must be supplied by the customer.
  • With floating offset collecting pipes, to compensate for heat expansion.

Table of contents

Wiring diagram

WHP 25-22 - Wiring diagram

Predecessor - successor

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