This website uses cookies to facilitate your use of the Website. more information

WWB-series - water/water booster for indoor installation

WWB 21

Article Number 10062901

Produces hot water exactly where it's needed.

Domestic hot water temperature with heat pump up to 65°C
Recommended use Heat source (heating water) 18°C to 42°C

The booster is particularly suitable for applications where a small amount of energy is needed at a higher temperature level and it is not economical to heat a whole network to the higher level. The heat source used in normal case heating water.


  • Hot water
  • Reheat circulation losses

For faster installation, the units are factory-fitted with the following components:

  • Heat pump controller Luxtronik 2.0
  • Energy efficiency circulating pump for the heating circuit
  • Filled with fluorinated greenhouse gas R134A
  • Heat metering

Additionally included:

  • Vibration decoupling for the heating circuit condenser
  • Vibration decoupling for the heating circuit evaporator
  • Screws for wall mounting


Article Number 10062901
Equipment designation WWB 21
Capacity for heating (kW) 2 (W25/W50)
COP 4,4 (W25/W50)
Max. flow temperature 70
Cooling No
Heat source W/W
Indoor/ Outdoor installation Indoor installation
Detached/semidetached house Yes
Multiple dwelling Yes
Industrial building No
New building Yes
Refurbishment Yes
manual (230 V) EN
controller (part 1) EN
controller (part 2) EN
logbook EN

Possible energy efficiency classes
Space heaters (35° C, 55° C): A+++ to D Ӏ Combined space heaters: A+++ to G Ӏ Combi heaters: A+++ to D Ӏ Hot water preparation: A+ to F Ӏ Combination combi heaters: A+++ to G Ӏ Hot water tanks: A+ to F Ӏ Domestic hot water preparation: A+ to F Ӏ Ventilation: A+ bis G