Ask Dave, he’ll know.” I had just walked into the inside sales area to give our salesman a list to quote. A friendly competitor was looking for answers and one of the salesmen told him to ask me for my thoughts. He had recently installed a new boiler with five zones of radiant heating in an old farmhouse.

“When any three out of five zones run, no problem, but have the fourth and/or fifth zone(s) come on and there’s not enough heat to satisfy any of the thermostats.”