Varisol S32- Differential Thermostat with 2 or 3 sensors for Standard or PWM Pumps

Differential thermostat Varisol-S32 (SP-DT) is a necessity of each moderate-sized solar thermal system which aims to maximize the solar yield.

It can drive standard and PWM pumps as well at a constant speed and incorporates an extra output for auxiliary source activation (boiler, electrical source, etc).

If your solar thermal installation consists of a collector field, a double or triple energy hot water store with two or more sensor inputs, and an auxiliary power source such as a boiler this is the adequate controller to select.