According to the compatibility chart it looks like the Nest Learning Thermostat CAN be used with a heating only system like fuel oil furnace. When I spoke to someone on the phone, she said it couldn't be used with heating only systems. Does anyone know for sure???
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I have used my Nest Thermostat with 2 different heating systems. The first, a gas fueled boiler for radiators. This one was well integrated and controlled the burner and the circulation (of water). It was a newer model boiler (less than 10 years). I don't recall the make.
I am currently using it with a Viessman... older 18 years. I do not control the burner, only turn on/off the circulating pump. It is a bit of a hack... I spliced the Nest controller into the pump... It works decently. The only issue is the burner goes into security mode sometimes in the wee morning... and of couse, the nest turns on the pump... which only circulates cold water until I reactivate the burner. The boiler is on it's last legs... but the Landlord is waiting for it to die...
In both cases, there is no cooling system.
I am glad to hear everything is good to go for you. I wanted to follow up, and let everyone know that I will be locking the thread in 24 hours. Please let me know if you have any questions from here, as I would be happy to review.