1. What is a Boiler Sizing Calculator?

Definition: This calculator estimates the required boiler power in kilowatts based on heat output in BTU/hour.

Purpose: It helps HVAC professionals and engineers determine the appropriate boiler size for heating applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The formula converts British Thermal Units per hour to kilowatts using the conversion factor 3412 BTU/h = 1 kW.

3. Importance of Proper Boiler Sizing

Details: Correct boiler sizing ensures efficient operation, prevents energy waste, and maintains system reliability.

4. Using the Calculator

Tips: Enter the required heat output in BTU/hour. The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why 3412 as the conversion factor?
A: 1 kW is equivalent to 3412.142 BTU/h, which is the standard conversion factor between these units.

Q2: Where do I find the heat output requirement?
A: Heat output can be calculated based on building heat loss or obtained from heating load calculations.

Q3: Should I add a safety factor?
A: Yes, typically add 10-20% to the calculated value for operational safety margins.

Q4: Can this be used for steam boilers?
A: This provides basic sizing, but steam boilers require additional considerations like pressure and steam quality.

Q5: What's a typical residential boiler size?
A: Most homes require 30-150 kW boilers, depending on size, insulation, and climate.