]Well Ridgekid - the Filtrete 30 50 does the trick!! It will work for almost any configuration I can think of using one of our wood boilers. The key is the differential setting that is configurable on the 30 50 between two heat sources. The honeywells wait like 4 min then kick the secondary heat source in to play, not what we want. I was able to set a 10 degree delta between the boiler and my natural gas furnace burner coming on. It works like a charm!!!
And the darn thing is wireless with applications to mange it remotely!!!! Here is how its wired for my configuration:
C - common hot to run the Wi-Fi
G - Open
Y - Yellow
W - Green (fan)
R- Red
W2 - White
So when Heat is called for just my forced air fan comes on (W), if the boiler is out of wood or the pump dies and the thermostat sees a 10 degree temperature drop the secondary (w2) comes on. I may shorten the delta so the house doesn't get so cold if there is a problem, but right now I just do not want to use any natural gas!! The free software even has detailed logging to dial you system in.. an example below. Thanks for all that provided input - I appreciate it. If you have any questions, 'll do my best to help you out but this thermostat does the trick!!