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A flame scanner sensing device that contains lead sulfide is used to detect infrared light.

The ASME Boiler and Pressure Vessel Code requires at least one water column on all boilers.

A flame scanner sensing device that contains lead sulfide is used to detect infrared light.

Balancing the water flow in a two-pipe reverse-return system is much easier than in other types of systems because the resistance to the water flow is the same for all heating units.

___ can result in bags and blisters.

Hot water boilers use ___ instead of the bottom blowdown valves used with steam boilers.

Hot water boilers use ___ instead of the bottom blowdown valves used with steam boilers.

The nonflammable material used to insulate the outer surface of a boiler from heat is ___.

The scales used on diaphragm gauges vary from hundredths of an inch to several inches of ___, depending on the pressure being measured.

The nonflammable material used to insulate the outer surface of a boiler from heat is ___.