Heat Pump Water Heaters

Key Points:

  • Hot water storage, 222 or 302 litres 
  • Electric boost option for quick hot water
  • Power consumption just 0.55kWh
  • Approx run cost/day $1.00/grid, $0.40/solar
  • About 1/4 the run cost of electric element type
  • German engineered for Australia
  • Very quiet with encased compressor
  • Operates down to minus 5°C
  • Low heat loss from storage tank
  • Suitable for hard or soft water with maintenance-free current impressed anode
  • Active defrost function in cold conditions
  • All-in-one design for easy installation
  • Ideal appliance for your solar PV system
  • The storage tank acts like a battery, storing thermal energy to use 24/7
  • Good warranty support from Stiebel Eltron
heat pump water heaters

How it Works:

  • A fan draws air through the evaporator
  • Thermal energy from the air is transferred
    to refrigerant changing it from liquid to gas
  • The refrigerant gas is fed into the compressor which makes it very hot by increasing pressure
  • The hot gas is circulated around the outside of the water cylinder
  • This heats the water inside the tank and
    condenses the gas back to liquid
  • The pressure is eased by the expansion valve
  • The process starts again
  • It takes far less electricity to run a compressor compared to an electric element
  • The physical process of phase change, liquid/gas/liquid gives off energy
  • Direct heat transfer from the wrap around tank refrigerant panels uses no power, hence is more efficient than a heat exchanger with water pump
  • These reasons are why the running cost is about 1/4 of an electric element water heater