Boiler Sizing Calculator
Size hot water and steam boilers for commercial and residential heating.
Standard Boiler Sizes
| BHP | MBH Output | Input (Gas) |
|---|---|---|
| 50 | 1,675 | 2,100 MBH |
| 100 | 3,350 | 4,200 MBH |
| 150 | 5,025 | 6,300 MBH |
| 200 | 6,700 | 8,400 MBH |
| 300 | 10,050 | 12,600 MBH |
1 BHP = 33,475 BTU/hr output
Design Guidelines
Piping Loss: 5-15% for insulated, 15-25% uninsulated
Pickup Factor: 10-20% for intermittent heating
Multiple Boilers: Consider N+1 redundancy
Turndown: Modulating boilers 5:1 to 10:1