1. What is a Boiler Size Calculator?

Definition: This calculator determines the required boiler size in kilowatts (kW) based on your heating load in BTU/h.

Purpose: It helps homeowners and HVAC professionals properly size boilers for efficient heating system operation.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Boiler power (kilowatts)
• \( Q_{btu} \) — Heating load (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 energy efficiency, proper heating capacity, and prevents short cycling or insufficient heating.

4. Using the Calculator

Tips: Enter your building's heating load in BTU/h. The value must be greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my heating load?
A: A Manual J calculation performed by an HVAC professional provides the most accurate heating load.

Q2: Why 3412 in the formula?
A: This is the conversion factor between BTU/h and kW (1 kW = 3412.142 BTU/h).

Q3: Should I round up the boiler size?
A: Typically, round up to the nearest standard boiler size available from manufacturers.

Q4: Does this account for domestic hot water?
A: No, this calculates space heating needs only. Add 10-15% if the boiler also heats water.

Q5: What's the typical range for residential boilers?
A: Most homes require 30-150 kW boilers, depending on size and climate.