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 homeowners, engineers, and HVAC professionals select the appropriately sized boiler for heating requirements.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Boiler power output (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 efficient operation, prevents energy waste, and extends equipment lifespan. Oversized boilers cycle more frequently while undersized ones can't meet demand.

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: How do I determine my required heat output?
A: Calculate based on building size, insulation, climate, and heat loss factors. Professional heat load calculations are recommended.

Q2: Why is 3412 the conversion factor?
A: 1 kW equals 3412 BTU/hour - this is the standard conversion between these units of power.

Q3: Should I round up the boiler size?
A: Typically yes, to the nearest standard boiler size, but consult with an HVAC professional for specific applications.

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

Q5: What's a typical BTU requirement for a house?
A: Roughly 30-60 BTU/sq.ft depending on climate and insulation, but professional calculations are more accurate.