The Delta-T controller is a differential temperature specifically designed to regulate the operation of a solar heating system, the Delta-T monitors collector and storage temperatures and automatically turns pumps on or off when the right temperature is reached. The controller can also provide additional functions, such as system freeze protection by recirculation and storage tank high-limit shut-off.
The Delta-T Pro contains all the basic functions of the Delta- T, but adds much more. The Pro unit is an exceptional addition to any residential solar hot water system. Its full potential is utilized in larger commercial installations where system performance and monitoring is critical.
FEATURES: - Exportable energy data. - Fully adjustable system settings . - Variable speed pump operation. - Zone pump operation. - High capacity relays. - 120/240 VAC, 50-60 Hz power .
Heliodyne Delta T Controller 
The Delta-T controller is a differential temperature specifically designed to regulate the operation of a solar heating system, the Delta-T monitors collector and storage temperatures and automatically turns pumps on or off when the right temperature is reached. The controller can also provide additional functions, such as system freeze protection by recirculation and storage tank high-limit shut-off.