1. What is a Boiler Size Calculator?

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

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The formula converts British Thermal Units per hour to kilowatts, with 3412 BTU/h equaling 1 kW.

3. Importance of Proper Boiler Sizing

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

4. Using the Calculator

Tips: Enter the required heat output in BTU/h. The value must be greater than 0. The calculator will output the equivalent boiler size in kW.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine my required heat output?
A: A heat load calculation considering square footage, insulation, climate, and other factors is needed for accurate BTU/h requirements.

Q2: Why is 3412 the conversion factor?
A: 1 kW equals 3412.142 BTU/h, which is the standard conversion between these units of power.

Q3: Should I round up the boiler size?
A: Typically yes, as boilers come in standard sizes. Consult with an HVAC professional for specific recommendations.

Q4: What if I have my heat load in other units?
A: Convert to BTU/h first. For example, 1 therm = 100,000 BTU, 1 MBH = 1,000 BTU/h.

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