Differential thermostat for solar water heating and other applications
Amazon.com: AC 220V 5A Multifunction Digital Temperature Difference Controller Differential Thermostat with Sensor Probe for Solar Water Heater : Industrial & Scientific
DIFFERENTIAL THERMOSTAT HOME SOLAR HOT WATER HEATING PUMP CONTROLLER 12V 10A BOX | eBay
Digital Differential Outlet Thermostat for Attic Ventilation Digital differential thermostat for heating, cooling, ventilation, and humidity control in attic, roof, basement [TD330] - $94.99 : Auber Instruments, Inc., Temperature control solutions for
SBE Solar Tech Digital Differential Thermostat - Programmable Household Thermostats - Amazon.com
Novus N321S Differential Temperature Controller 80321S3012 3 PACK - Thermal Devices - Thermal Devices