Honeywell TH1100DV1000 Non-Programmable, Heat Only, Vertical Thermostat 24V or 750mv, Single Stage. Description: Thermostat Type Digital Non-Programmable, 1-Heat, 1-Stage, Manual Changeover Cover Type Rectangular Vertical Color Premier White Voltage Rating 20 to 30 Volt AC/750 Millivolt at 50/60 Hertz Current Rating 0.02 to 1 Amp (Heat) Size 2-7/8 Inch Width x 1-1/8 Inch Depth x 4-11/16 Inch Height Display Size 1.32 Square Inch Switch Position Heat-Off (System) Power Method Dual Power Terminal Designations R, C, W Humidity 5 to 90 Percent Relative (Non-Condensing) Setting Temperature Rating 40 to 90 Deg F/35 to 90 Deg F (Heat) UPC:  085267133852 Part Number: TH1100DV1000/U UNSPSC: 41112209 Features: The backlit display is easy to read Displays ambient (measured) temperature at all times One-touch access to a setpoint temperature Built-in compressor protection. Please note: Make sure heating and cooling temperatures are set to acceptable ranges: Heat: 40F to 90F (4.5C to 32C).