The TH114 Series delivers the features that matter most in a non-programmable thermostat: an easy-to-read backlit display, slim contemporary design and precise temperature control. Three choices of temperature control in a single thermostat (ambient, floor, or ambient with floor temperature limits) GFCI and EGFPD test light verifies safety control is functioning properly and alerts if a leak is detected 15 mA equipment ground fault protection devices (EGFPD) on GB models Advanced temperature control ensures total comfort by minimizing temperature swings On/standby switch enables thermostat shutdown at the end of heating season for added security