1. What is a Boiler Size Calculator for House?

Definition: This calculator estimates the required boiler size in kilowatts (kW) based on the heat output needed for a house in BTU/h.

Purpose: It helps homeowners and HVAC professionals determine the appropriate boiler capacity for residential 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)
• 3412 — Conversion factor from BTU/h to kW

Explanation: The heat output in BTU/h 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 heating, prevents energy waste, and extends equipment lifespan while maintaining comfort.

4. Using the Calculator

Tips: Enter the required heat output in BTU/h (typically calculated based on house size, insulation, and climate). The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine my house's heat output?
A: Use a heat loss calculation considering square footage, insulation, windows, and climate. Professional HVAC assessments are recommended.

Q2: Why convert BTU/h to kW?
A: Many modern boilers are rated in kW, while heat loss calculations often produce results in BTU/h.

Q3: What's a typical boiler size for a house?
A: Average homes (1500-2000 sq ft) typically need 30-60 kW boilers, but this varies significantly based on insulation and climate.

Q4: Should I round up the boiler size?
A: It's common to round up to the nearest standard boiler size, but oversizing more than 15% can reduce efficiency.

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