The Honeywell Home Millivolt heat only thermostat is a non-programmable option that features low voltage controls and a convenient snap-action switch for millivolt systems such as fireplaces and floor or wall furnace systems. Incredibly easy to install, this manual thermostat includes mounting hardware and wall plated positions that make it extremely versatile for any number of positions. This Honeywell Home non-programmable thermostat is mercury free and designed specifically with the consumer in mind. Devoid of any traces of mercury and relatively simple to install, this non-programmable thermostat is easily read and even easier to adjust.