Schluter® DITRA-HEAT-E-RRS POWER MODULE WHITEThe DITRA HEAT E RS1 Smart Thermostat is Schluter's top tier controller app control, geofencing, Google Home and Alexa integration. If you're running the RS1 and need to heat more floor than it can drive on its own (its limit is 15 amps), the E RRS power module extends its capacity. Same principle as the standard E RR module, but designed exclusively for the RS1: a low voltage signal wire connects the RS1 to the E RRS, and when the RS1 calls for heat,