SR802 contact relay for solar water heater controller in stock at affordable price. Shop with Multline at relatively low prices. Costs ksh 4,000 from cash 4,500. Install this high power relay for control of solar water heater tank backup element when using the SR series Electronic Solar Water Heater Controller. Connect the Heating Function output of the solar controller to the relay for activation of power to the water heating element. Using the relay permits use of timed operation of the water heating element, or other high power devices.