1. What is a Steam Boiler Sizing Calculator?

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

Purpose: It helps engineers and HVAC professionals properly size steam boilers for heating systems and industrial processes.

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 and safety.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is the 3412 conversion factor?
A: It's the exact conversion between BTU/hour and kilowatts (1 kW = 3412.142 BTU/h).

Q2: How do I determine my required heat output?
A: Calculate building heat loss or process heat requirements based on temperature differentials and insulation values.

Q3: Should I add a safety factor to the result?
A: Yes, typical practice is to add 10-20% to the calculated boiler size for safety margin and future expansion.

Q4: Does this work for both steam and hot water boilers?
A: Yes, the power calculation is the same, though steam systems may require additional considerations for pressure.

Q5: What's a typical residential boiler size?
A: Most homes require 80,000-150,000 BTU/h (23-44 kW) depending on size and climate.