Connect Taco Radiator system to a new Honeywell wireless thermostat
This turned out to be much easier than I expected.  The EIM that had been setup for A/C only had the R Rc Rh terminals connected by jumpers.


I removed the jumper on the Rh terminal because the heating system
had it's own 24V power. 
I replaced the wire that was coming from the old wired thermostat with a new one that I connected to the Rh terminal and W terminal on the EIM.


The thermostat had already been connected to the EIM so these steps were all it took.