The water-wall boiler eliminates problems associated with refractory maintenance. Fast boiler startup and heating rates are not concern with water-wall designs. The entire furnace expands and contracts uniformly as a unit. This eliminates relative expansion problems that occur at the interfaces between water-cooled walls and refractory casing
Steam Boiler Chemicals - Oxygen, Scale, and pH Adjustments
100305187 2000558071 Rev B WHB Service Manual (34309)
Here are some daily steps you can take to check your boiler: Make sure the area around the boiler is clear and unobstructed. Check for leaking water under and around the boiler. Make sure all temperature and pressure readings are in the right ranges for proper boiler operations. Check for blockages in any air openings.
performing maintenance. Boiler operation † Do not block flow of combustion or ventilation air to the boiler. † Should overheating occur or gas supply fail to shut off, do not turn off or disconnect electrical supply to circulator. Instead, shut off the gas supply at a location external to the appliance. † Do not use this boiler if any part has been under water.