Boiler Size Calculator

Calculate Boiler Size Requirements

Building Type

Heating System

Building Area (sq ft)

Ceiling Height (ft)

Climate Zone

Insulation Level

Number of Windows

Safety Factor (%)

About Boiler Sizing

Proper boiler sizing is essential for efficient heating, energy savings, and system longevity.

Sizing Factors:

Building Size: Square footage and volume
Climate: Heating degree days
Insulation: Heat loss prevention
Windows: Heat loss areas
Usage: Occupancy patterns

Heat Loss Calculation:

Heat Loss = Area × U-Value × Temperature Difference

Common BTU Requirements:

Residential: 30-50 BTU/sq ft
Commercial: 40-60 BTU/sq ft
Industrial: 50-80 BTU/sq ft
Warehouse: 20-40 BTU/sq ft

Boiler Types:

• Gas-fired boilers
• Oil-fired boilers
• Electric boilers
• Condensing boilers
• Steam boilers

Efficiency Considerations:

• AFUE ratings
• Seasonal efficiency
• Load matching
• Modulation capability
• Maintenance requirements

Proper sizing ensures optimal performance, energy efficiency, and comfort while preventing oversizing and energy waste.