Drain Back

This type solar water heater has pumps to circulate thermal media, (water, or glycol) to exchange heat from the solar collector to the water storage tank.

Thermal media circulate and collect heat from the collector and transfer to the drain back storage tank. The solar pump activates and heat transfer occurs only when it is required and as a result heating of the water happens in the controlled manner.

As the media drains to the drain back tank from the collector freely, the storage tank always needs installed below the collector and the interconnecting pipes must have slope.
Tanks can be installed separately from the collector
No overheating
Electric backup heater with auto temperature control
Remote monitoring & Control options

Drain Back Solar Water Heater

Drain back systems are closed-loop, indirect, active solar water heating systems. Glycol-water or mix of both will act as heat transfer media. The heat transfer media contained in an unpressurized, closed loop is pumped through the collectors. The media will transfer heat to the domestic water through a heat exchanger.