Corrosion is the accumulation of sludge on boiler heating surfaces.

Hot water heating systems produce heat more consistently than steam heating systems.

Boilers equipped with a quick-opening valve and a slow-opening valve must have the quick-opening valve closest to the boiler shell.

Hot water heating systems produce heat more consistently than steam heating systems.

Steam traps are ___ devices that increase overall system efficiency by removing air and condensate without the loss of steam.

___ -pipe systems are used when different parts of a system require heating and cooling simultaneously.

Makeup water is always added from a city water supply line with a manual makeup water system.

Natural draft is regulated using ___ to control the flow of gases of combustion into a stack.

A boiler is given a bottom blowdown to ___.

The amount of energy required to raise the temperature of 1 lb of water 1°F is 1 ___.