1. What is a Heat Only Boiler Size Calculator?

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

Purpose: It helps HVAC professionals and homeowners determine the appropriate boiler capacity for 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)

Explanation: The formula converts BTU/h to kW using the conversion factor of 3412 BTU/h per kW.

3. Importance of Proper Boiler Sizing

Details: Correct boiler sizing ensures efficient operation, prevents energy waste, and maintains system longevity.

4. Using the Calculator

Tips: Enter the heat output in BTU/h. The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the significance of 3412 in the formula?
A: 3412 BTU/h equals 1 kW, which is the standard conversion factor between these units.

Q2: How do I determine my heat output requirement?
A: Perform a heat loss calculation for your building or consult with an HVAC professional.

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 margins.

Q4: Does this calculator work for combi boilers?
A: This calculates heat-only requirements. Combi boilers need additional capacity for domestic hot water.

Q5: What's a typical BTU/h requirement for a house?
A: A well-insulated 2,000 sq ft home might need 60,000-80,000 BTU/h in cold climates.