The Honeywell Home CT30A1005 Heat Only Thermostat has low voltage controls with a snap-action switch for heating systems. This non-programmable thermostat comes with mounting hardware (wall plate included) and does not require leveling. For straightforward temperature control, there's no substitute for Honeywell Non-Digital Thermostats. This manual thermostat controls heating in your home simply and effectively. Mercury free and compatible with heat only systems, this Honeywell Non-Programmable Thermostat has been an industry standard for years. Complete with mounting hardware and a wall plate, this Heat Only Non-Programmable Thermostat is built with low voltage controls and a snap-action switch for heating systems. This Honeywell Home Manual Thermostat makes heat control in your home a breeze. No leveling is required. Compatible with heat only systems and stream or gravity Simple, worry-free operation Easy to install and use Bimetal temperature sensor Mercury Free Use with floor/wall furnace 24v or 750mv Use with volt gas fireplace 24v or 750mv