1. What is a Boiler Size Calculator?

Definition: This calculator determines the required boiler size in kilowatts (kW) based on the heating load in British Thermal Units per hour (BTU/h).

Purpose: It helps HVAC professionals and homeowners select the appropriately sized boiler for their heating needs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Boiler power (kilowatts)
• \( Q_{btu} \) — Heating load (BTU per hour)
• 3412 — Conversion factor from BTU/h to kW

Explanation: The heating load in BTU/h is divided by 3412 to convert it to kilowatts, which is the standard unit for boiler sizing.

3. Importance of Proper Boiler Sizing

Details: Correct boiler sizing ensures efficient operation, prevents energy waste, and extends equipment lifespan while providing adequate heating capacity.

4. Using the Calculator

Tips: Enter the heating load in BTU/h (must be > 0). The calculator will output the required boiler size in kW.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine my heating load?
A: Heating load can be calculated by an HVAC professional through a Manual J calculation or estimated based on square footage and insulation.

Q2: Why convert BTU/h to kW?
A: While BTU/h is common for heating loads, boiler capacity is typically rated in kW, making this conversion essential for proper equipment selection.

Q3: What's the significance of 3412?
A: This is the conversion factor where 1 kW = 3412.142 BTU/h, based on the exact definition of the BTU.

Q4: Should I round up the boiler size?
A: It's common practice to round up to the nearest standard boiler size, but consult with an HVAC professional for your specific needs.

Q5: Does this account for system efficiency?
A: No, this is a basic calculation. For actual sizing, consider boiler efficiency and consult manufacturer specifications.