My wife just turned the thermostat "all the way up to 66" Her words. I guess I finaly got her trained. Anyway, burned a rebuilt parlor stove last year. Very hot, not very airtight. Swicthing to a tempwood with an internal add-on iron pipe manifold this year. This is a prototype. If I had found this site sooner, I 'd probably be doing it differently. My plan is to pipe in series on the return side of the o.f.b. I have a single zone with monoflo tees and .5 inch baseboard. I set up the stove for an aquastat relay, to control my ONE circulator, in paralell with the o.f.b. aquastat. An extra relief valve completes the install. An electrical engineer aprove the wiring plan as long as both aquastats are powered by the same circuit breaker (in case the circ moter shorts internaly while both aquastats happen to be calling). Anyone care to comment ? Love this site, learned a lot already, thankyou!