RTH21B/U

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Application	24 Vac systems, single stage heat + cool systems. Gas, Oil, Electric, or Steam / Gravity Systems\| Single stage heat pumps without aux heat.
Thermostat Type	Programmable
Stages	1 Heat /1 Cool Conventional Systems\|1 Heat /1 Cool Heat Pump Systems
Display Type	LCD Screen
Display Size	4.84 sq. in.
Display Language	English
Displayed Information	Mode\|Current Temperature\|Set Temperature\|Status Display\|Fan\|Time
Modes of Operation	Heat\|Off\|Cool\|Auto
Program Type	7-Day Programmable\|5-1-1 Programmable\|5-2 Programmable\|1 Week
Alerts and Reminders	Battery Replacement\|Filter Change
Heat-Cool Changeover	Manual or Auto Changeover
Power Supply	Battery or Hardwired
Frequency	60 Hz
Number of Batteries	2
Battery Size	AA
Battery Type	AA Alkaline
Warranty	1 Year Limited
Includes	Screws & Anchors\|UWP™ Mounting System\|Thermostat\|Literature
Color	White
Ambient Operating Temperature (Max)	120 °F\|49 °C
Ambient Operating Temperature (Min)	32 °F\|0 °C
Differential Temperature	± 1 °F\|± 0.5 °C
Ambient Relative Humidity (Max)	90 % Rh
Ambient Relative Humidity (Min)	5 % Rh
Temperature Accuracy	±1 °F\|±0.5 °C
Electrical Connection Type	UWP Mounting System
Set point Temperature (Max)	Heat: 90 °F\|Cool: 99 °F\|Heat: 32 °C\|Cool: 37 °C
Set point Temperature (Min)	Heat: 32 °F\|Cool: 50 °F\|Heat: 0 °C\|Cool: 10 °C
Shipping and Storage Temperature (Max)	120 °F\|49 °C
Shipping and Storage Temperature (Min)	-20 °F\|-29 °C
Switch Type	Relay
Product Height	3.44\|87
Product Width	5.13\|130
Product Depth	1.188 in \|29.5 mm