EMS Si - HVAC System Compatibility

HVAC System Compatibility

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

2 remote sensor inputs                                   Yes
(dry contact and/or 10K
resistive temperature only)


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