1. What is a Gas Boiler Size Calculator?

Definition: This calculator converts heat output in BTU/h to boiler size in kilowatts (kW).

Purpose: It helps HVAC professionals and homeowners determine the appropriate boiler size needed for heating requirements.

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 conversion factor 3412 represents the number of BTUs per hour equivalent to 1 kilowatt of power.

3. Importance of Proper Boiler Sizing

Details: Correct boiler sizing ensures efficient operation, prevents energy waste, and maintains comfortable temperatures.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Where do I find my heat output requirement?
A: Heat output can be calculated from heat loss calculations or found in building specifications.

Q2: Why convert BTU/h to kW?
A: Many modern boilers are rated in kW, while heating requirements are often calculated in BTU/h.

Q3: What's the conversion factor 3412?
A: It's the exact conversion between BTU/h and kW (1 kW = 3412.142 BTU/h).

Q4: Should I round up the boiler size?
A: Yes, it's common practice to round up to the nearest available boiler size for safety margins.

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