1. What is a Boiler Size Calculator?

Definition: This calculator estimates the required boiler size in kilowatts based on the heat output needed for your home in BTU/h.

Purpose: It helps homeowners and HVAC professionals determine the appropriate boiler capacity for efficient home heating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Boiler power (kilowatts)
• \( Q_{btu} \) — Heat output required (BTU per hour)

Explanation: The formula converts British Thermal Units per hour to kilowatts (1 kW = 3412 BTU/h).

3. Importance of Proper Boiler Sizing

Details: Correct boiler sizing ensures efficient operation, prevents energy waste, and maintains comfortable temperatures without short cycling or insufficient heating.

4. Using the Calculator

Tips: Enter your home's required heat output in BTU/h. This can be determined through a heat loss calculation or obtained from an HVAC professional.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my home's heat output requirement?
A: A professional heat loss calculation is most accurate, or use 30-60 BTU per square foot as a rough estimate (depending on climate and insulation).

Q2: Why 3412 in the formula?
A: This is the conversion factor between kW and BTU/h (1 kW = 3412.142 BTU/h).

Q3: Should I round up the boiler size?
A: Typically yes - choose the next available boiler size above your calculation to ensure adequate capacity.

Q4: What if my boiler is too large?
A: Oversized boilers cycle on/off more frequently, reducing efficiency and potentially shortening the system's lifespan.

Q5: Does this account for hot water needs?
A: No, this calculates space heating only. Add 3-5 kW if the boiler will also provide domestic hot water.