The Manual says that this thermostat can only be used with a resistive load over 2A .
Is there any way this ca be change to use it for a furnace heating system ? Not resistive ?
Thanks

The instructions on this thermostat indicate it can be used to control a 115 volt to 220 volt circuit. The thermostat also operates off 115 volt or 220 volts. So the answer is NO you cannot use it on a standard 24 volt control system used on a furnace/heat pump/etc.

The unit also does not have a standard heat anticipator circuit necessary for proper 24 volt operation.