Solar is Smart.
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SmartTank Drain-back system
In cold climates the ultimate freeze protection
Economical solution easy to install!
A fail-safe method of ensuring that
collectors and collector loop piping
never freeze is to remove all water from the collectors and piping when
the
system is not collecting heat. This is a major feature of the drain back
system. Freeze protection is provided
when the system is in the drain mode. Water in the collectors and
exposed piping
drains into the insulated drain-back reservoir tank each time the pump
shuts
off. Overheating is also prevented by means of a high temperature
shutoff.
A heat exchanger transfers heat from the collector loop fluid to the potable water in the solar storage tank.
The SmartTank shown here contains the drain-back tank, differential controller, two pumps (one for solar panel loop, one for the storage tank loop), a heat exchanger, and all the fittings combined in an easy to install unit. Simply connect the two water lines to the panels, the two water lines to the storage tank, the heat sensors, and plug it in and the installation is complete.