An installer plans to replace an outdoor wood-fired furnace with a new cordwood-gasification boiler with a rated output of 150,000 Btu/hr. The outdoor furnace is located about 100 ft. from the indoor mechanical room where the 1-in. PEX insulated underground piping joins the thermal storage tank. The installer plans to use the existing underground piping.
An installer wants to achieve hydraulic separation between three zone circulators. He also wants to have the same supply water temperature to each zone, so he pipes up what he calls a “modified primary/secondary system.”