Honeywell T87K1007 Round Non-Programmable, Heat Only, Mechanical Thermostat

The Round T87K and T87N thermostats provide electronic control of 24Vac heating and cooling systems with the classic twist to set dial.FeaturesMercury FreeClassic StylingPremier WhiteSeparate temperature setting and thermometerThe T87K heat only works with 2 or 3 wire heat only systemsThe Easy-To-See has enlarged scale and raised numbers plus it click at every 2ªF change