Packaged boiler
A factory-assembled boiler supplied as an integrated equipment package.
Condensing boiler
A boiler designed to recover heat by condensing water vapour in flue gas under suitable conditions.
Equivalent full-load hours
Annual useful load expressed as the number of hours at full capacity.
Make-up water
Water added to replace losses from a boiler or steam system.
Blowdown
Controlled removal of boiler water to manage dissolved solids and impurities.
Economizer
Equipment that recovers heat from flue gas to preheat water or air.
Burner turndown
The ratio between maximum and minimum stable burner firing rates.
Hydronic system
A heating system that circulates water to deliver heat.
Refractory
Heat-resistant material used in combustion and high-temperature areas.
Authority having jurisdiction
The organization responsible for applicable approvals and enforcement.