1. What is a System Boiler Size Calculator?

Definition: This calculator estimates the required boiler size in kilowatts (kW) based on the heat output in British Thermal Units per hour (BTU/h).

Purpose: It helps HVAC professionals and engineers determine the appropriate boiler capacity for heating systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The formula converts BTU/h to kW 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 longevity.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why is 3412 the conversion factor?
A: 3412 BTU/h equals 1 kW, which is the standard conversion between these units of power.

Q2: How do I determine my required Q_btu?
A: Calculate your building's heat loss or consult HVAC design manuals based on square footage, insulation, and climate.

Q3: Should I add a safety factor to the result?
A: Yes, most systems add 10-20% capacity to account for extreme conditions and system losses.

Q4: What's a typical residential boiler size?
A: Most homes require 30-150 kW boilers (100,000-500,000 BTU/h), depending on size and climate.

Q5: Can I use this for commercial systems?
A: Yes, the formula scales for any size system, but commercial applications require professional load calculations.