Are you plumbing this through a hot water or other storage tank? curious. I have a coil too but havent used it yet and want to get it installed at some point. I have an oil boiler with no tank or seperate hot water tank.
I have a hot water storage tank. My storage tank is hooked up like an extra zone on my heating system. There is an aquastat in the tank and when the temp in the tank falls below the set temp, it calls for heat.
It does NOT use a hot water coil in my boiler.
Go the the link in the 1st post above and see the post from me on "by beatle78 on Fri Oct 05, 2007 2:34 pm"
It has a drawing that is exactly how I hooked it up(plumbing wise). It doesn't show electrical hookups, but they are pretty easy if you have basic electrical skills.
I HIGHLY recommend this. My furnace hasn't come on for quite some time now. I'm saving a TON of money on oil (or lack thereof) this year!
Those arabs can keep their oil. My house is heated my resources of the GOOD 'OL USA!!!