HVAC System Compatibility
Information
The EMS Si 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 EMS Si 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 EMS Si supports the following
equipment:
Equipment Supported?
Gas/Oil/Electric heating Yes
(up to two stages)
Heat pump with auxiliary heat Yes
(up to three stages)
Geothermal Heat Pump Yes
Dual fuel systems Yes
Standard electric cooling Yes
(up to two stages)
Boilers Yes
Sensors with dry contact outputs Yes
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