1. What is a Boiler Size Calculator?

Definition: This calculator determines the required boiler size in kilowatts (kW) based on the BTU (British Thermal Unit) heating requirement.

Purpose: It helps HVAC professionals and homeowners properly size boilers for efficient heating system performance.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Size} \) — Boiler capacity in kilowatts (kW)
• \( \text{BTU Required} \) — Heating requirement in BTU per hour
• \( 3412 \) — Conversion factor (BTU to kW)

Explanation: The BTU requirement is converted to kilowatts since most boiler specifications use kW ratings.

3. Importance of Proper Boiler Sizing

Details: Correct boiler sizing ensures energy efficiency, prevents short cycling, and provides adequate heating capacity without oversizing.

4. Using the Calculator

Tips: Enter the total BTU requirement for your space. The value must be > 0. The calculator will output the equivalent boiler size in kW.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine my BTU requirement?
A: Calculate based on square footage (30-60 BTU/sq ft), insulation quality, climate zone, and building characteristics.

Q2: Why 3412 as the conversion factor?
A: 1 kW equals 3412 BTU/h - this standard conversion factor ensures accurate sizing.

Q3: Should I round up the boiler size?
A: Typically yes - choose the next available boiler size above your calculated value.

Q4: Does this account for hot water needs?
A: No, this calculates space heating only. Add 10-20% if the boiler also provides domestic hot water.

Q5: What about system efficiency?
A: High-efficiency boilers may require less capacity. Consult with an HVAC professional for specific applications.