Venstar Wireless Thermostat 2-Wire Kit The ACC0436 is designed specifically for the Venstar wireless thermostat system T1100RF & T1100REC when used in conjunction with a boiler or other two-wire heating applications. It can be used for any 24VAC thermostat in a two-wire application. The kit consists of one plug-in transformer and one relay. Features: Use with T1100REC (not supplied) Contains plug-in 24V transformer and relay Allows control of 2-wire heat-only systems Can locate T1100REC conveniently near furnace Easy installation - requires nearby 110V outlet