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I've essentially obtained constant circ in my home by utilizing tekmar controls and thermostats. I have a conventional oil boiler and zone valves controlling 5 zones (two radiant underfloor with aluminum heat transfer plates, and three utilizing Runtal baseboard). All zones are supplied heat from the boiler via variable speed injection mixing. The living/dining/kitchen zone (radiant plates) is the hardest to heat so it has assumed the "controlling" zone duties. With the indoor feedback feature of the tekmar t-stats, and a deep outdoor set-back curve on the tekmar boiler control, the tekmar system has "learned" how to maintain the setpoint of the living room; no more, no less. With the variable speed injection, I can mix the supply water down to very low temps if needed and not worry about boiler flue gas condensation. By varying the supply water temp with VSI, my living room zone never quits calling for heat, yet never overheats. I always come down the stairs and step on a nice, warm wood and tile floor. Nothing like it on a frosty -40 below morning here in Fairbanks, AK. My wife thinks I'm a freakin' genius. Don't tell her different….