1. What is a Boiler Size Calculator?

Definition: This calculator estimates the required boiler size in kilowatts (kW) based on the heating load in BTU/hour.

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Boiler power (kilowatts)
• \( Q_{btu} \) — Heating load (BTU/hour)
• 3412 — Conversion factor (BTU/h to kW)

Explanation: The heating load in BTU/hour is converted to kilowatts by dividing by 3412 (since 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.

4. Using the Calculator

Tips: Enter the heating load in BTU/hour (must be > 0). The calculator will output the required boiler size in kW.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my heating load?
A: A professional heat loss calculation is most accurate, or use our Heating Load Calculator tool.

Q2: Why convert to kW?
A: Boiler capacities are typically rated in kW, while heating loads are often calculated in BTU/hour.

Q3: Should I round up the boiler size?
A: Generally yes - choose the next standard boiler size above your calculation for safety margin.

Q4: What's a typical residential boiler size?
A: Most homes require 15-30 kW boilers, but this varies by climate and home size.

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