The Honeywell CT410B1017 manual 4 wire thermostat is a simple to install thermostat that's compatible with 120, 240 and 227 VAC baseboard systems. This thermostat's versatility is increased substantially with its implementation of a two or four-wire non-polarized connection. Temperature control is further boosted with a dual diaphragm that actively senses. The CT410B1017's versatility is only matched by its strength to hold up to an impressive 52,800 W. All of these welcoming additions and the unit's particularly easy on the eyes model make this the ideal thermostat to utilize in a host of applicable settings. Honeywell understands that thermostats shouldn't be needlessly complicated and have created a Series of appropriate units that meet the many demands one would place on a great product.