Use solar power directly for domestic water heating.

ELWA is a 2 kW photovoltaic water heating device. Direct current from photovoltaic modules is transferred directly to the built-in heating element and immediately converted into heat without loss. The built-in MPP Tracker ensures that the PV generator is always operated at the optimum operating point (similar to a PV inverter). For operation, no connection to the mains is required as the unit is powered by the PV generator (pure off-grid operation). The desired DHW temperature is set with a rotary knob, LED displays to inform about the current device status.



Always warm water, even during bad weather.


Due to the patented boost-backup function, hot water supply can be guaranteed even during bad weather. This makes it possible to completely switch off the conventional heating system in summer. This also increases its lifespan. For commissioning the boost-backup function, ELWA can be easily connected to a mains socket. There is no feed-in into the grid, so it does not need a metering point like a grid-connected PV system.





  • Easier and Cheaper than thermal solar systems 
  • No grid operator approval required 
  • Easier installation with "cables instead of pipes" 
  • No maintenance cost 
  • Even works in case of power failure
  • Boost-backup optionally usable 
  • No anti-freezing liquid necessary