User's Manual

HVAC System Compatibility
Inf
ormation
The Smart Si thermostat is designed to operate
with low-voltage heating and cooling systems.
It is not designed for use with line-voltage or
millivolt heating and cooling systems.
The Smart Si thermostat supports:
Up to 2 heat and 2 cool stages on a
conventional system.
Up to 3 heat and 2 cool stages on a heat
pump system.
The ecobee Smart Si thermostat supports the
following equipment:
Supported?
Yes
Yes
Yes
Yes
Yes
Equipment
Gas/Oil/Electric heating
(up to two stages)
Heat pump with auxiliary heat
(up to three stages)
Geothermal Heat Pump
Dual fuel systems
Standard electric cooling
(up to two stages)
Boilers Yes
3