Boiler Sizing Calculator

The Boiler Sizing Calculator is used to estimate the required capacity for a boiler in a hydronic (water-based) heating system. Proper boiler sizing is essential for efficient operation and adequate heating. Inputs typically include the total heat load of the building (BTU/hr), the boiler's efficiency (AFUE or thermal efficiency), and a sizing factor to account for pickup loads or losses. This tool helps determine both the net output capacity needed to meet the load and the gross input capacity, which is important for fuel supply considerations.

Boiler Types & Considerations: Boilers come in various types, including condensing boilers (highly efficient, often 90%+ AFUE), non-condensing boilers (typically 80-89% AFUE), and combi boilers (providing both space heating and on-demand DHW). Key considerations in boiler selection include modulation capability (ability to adjust output), the type of heating system (hot water vs. steam), and accounting for piping losses. Understanding these factors helps in selecting a boiler that not only meets the calculated capacity but also operates efficiently within the specific system.