1. What is a Whole House Boiler Size Calculator?

Definition: This calculator determines the appropriate boiler size in kilowatts (kW) based on your home's heat load in BTU/hour.

Purpose: It helps homeowners and HVAC professionals select the correctly sized boiler for efficient heating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The heat load is divided by 3412 to convert from British Thermal Units per hour to kilowatts.

3. Importance of Proper Boiler Sizing

Details: Correct boiler sizing ensures energy efficiency, proper heating, and prevents short cycling or insufficient heating capacity.

4. Using the Calculator

Tips: Enter your home's total heat load in BTU/hour. The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my home's heat load?
A: A professional energy assessment or Manual J calculation provides the most accurate heat load.

Q2: What's a typical heat load for a house?
A: Average homes range from 30,000-150,000 BTU/h depending on size, insulation, and climate.

Q3: Should I round up the boiler size?
A: It's common to round up to the nearest standard boiler size, but consult an HVAC professional.

Q4: Does this account for domestic hot water?
A: No, this calculates heating-only capacity. Add 10-15% if the boiler will also heat water.

Q5: What's the 3412 conversion factor?
A: It's the number of BTUs per hour equivalent to 1 kW of power (1 kW = 3412 BTU/h).