The hydronic system shown above was created to connect three gas-fired, cast-iron boilers to a low-temperature distribution system that supplies 12,000 ft. of 3/4 in. PEX tubing embedded in the floor slab.The installer spends several frustrating hours attempting to get the air out of the system. He finally gets it purged to the point that the distribution circulator is at least moving some water through the floor-heating circuits.
Joe Wrenchturner gets a call to install solar water heating for a longtime customer. He buys some flat-plate collectors through an online source and decides to assemble the remainder of the system using hardware he installs for other hydronic systems.
An installer is asked to provide a system that supplies two zones of fin-tube baseboard and two zones of floor heating. The system also supplies domestic water heating. He selects a mod/con boiler because it’s lighter than a conventional boiler.
An installer plans to use a geothermal heat pump to supply warm water to a multizone radiant ceiling panel system. Having heard that radiant ceiling panels also can be used for cooling, he decides to pump chilled water through the same radiant ceiling distribution system.
A low-mass copper tube boiler is installed with six zone circuits controlled by zone valves. The installer got a great price on a “contractor pack” of 3/4-in. copper tees, so the supply and return headers are build with 3/4-in copper, as are all the zone circuits.
A group of masons pour a 6-in.-thick concrete slab containing 5/8-in. PEX tubing at 12-in. spacing. A nearly complete layer of extruded polystyrene insulation is under the slab. But what are they doing wrong?
An installer decides to use a four-way motorized mixing valve to interface between a gas-fired, cast-iron boiler and a low-temperature radiant panel system.
An
old New England farm house has been heated with a two-pipe steam system serving
plenty of sturdy cast-iron radiators. As part of an extensive renovation and
insulation upgrade, the owner decides to upgrade the heat and convert the
system to a high-efficiency, gas-fired condensing boiler.
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