An APRS World, LLC ThermokSolar-4A runs the show

It controls:

-Two Liang EcoCirc circulation pumps for the solar hot water heating loop.
-One Liang EcoCirc pump for domestic heating.
-Morningstar Tri-Star dump controller. Prevents the Tri-Star from boiling the hot water tank.

It monitors:

-Tank top temperature
-Collector out temperature
-Outdoor ambient temperature
Tank bottom temperature
-Water meter (gallons)
-Input voltage
-Battery voltage