Recommended to be used with a Line Voltage hard-wired thermostat (p/n 1267), Line Voltage plug-in thermostat (p/n 368) or a programmable or non-programmable Low Voltage thermostat (p/n 588, p/n 8200008, p/n 587) with a Fan Relay (p/n 515). Can be configured in series with multiple units together with aquastats to prevent downstream fans from turning on before heat is available to those units. Does not come with a pigtail or hanging/attachment hardware.