Product Code: 22810
Calls for back-up heating from boiler when solar power is not available. Prevents collector and store from over heating and monitors the complete solar thermal installation. Suitable for typical UK solar thermal systems.
Solar controller (SHR 521 20) and 2 x sensors (FKP6 and FRP6).
Output 2 relays (max. 4A) power supply 230V AC 50Hz.