Resol’s TT2 thermostat controller is available for thermosiphon solar systems. With the integrated timer, hot water will always be available. By means of the rapid heat-up function, hot water also can be quickly provided outside the usual time frames — even from the living area, when the RCTT remote control is used. The TT2 is especially designed for the electric backup heating of a DHW store and is equipped with two high-current relays to which an electric immersion heater of up to 3.6 kW/1.8 kW can be connected. No additional auxiliary relays are required. Resol.