1. What is a Boiler Size Calculator?

Definition: This calculator determines the required boiler size in kilowatts (kW) based on the heat output needed in BTU/hour.

Purpose: It helps HVAC professionals and engineers properly size boilers for heating systems to ensure efficient operation.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The formula converts BTU/hour to kilowatts using the conversion factor of 3412 BTU/hour per kilowatt.

3. Importance of Proper Boiler Sizing

Details: Correct boiler sizing ensures energy efficiency, prevents short cycling, and provides adequate heating capacity.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why convert BTU/hour to kW?
A: Many boiler manufacturers specify capacity in kW, while heating requirements are often calculated in BTU/hour.

Q2: What's the conversion factor 3412?
A: 1 kW = 3412.142 BTU/hour, which is the exact conversion between these power units.

Q3: Should I round up the boiler size?
A: Yes, it's common practice to round up to the nearest standard boiler size for safety margin.

Q4: How do I determine my heat output requirement?
A: Perform a heat loss calculation for your building or consult HVAC design manuals.

Q5: Does this account for system efficiency?
A: No, this gives gross output. Divide by boiler efficiency (typically 0.8-0.95) for fuel input requirements.