1. What is an Electric Boiler Size Calculator?

Definition: This calculator determines the required size (in kW) of an electric boiler based on the heat output needed in BTU/h.

Purpose: It helps homeowners and HVAC professionals properly size electric boilers for heating systems.

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)
• 3412 — Conversion factor (BTU/h to kW)

Explanation: The formula converts British Thermal Units per hour to kilowatts, the standard unit for electric boiler sizing.

3. Importance of Proper Boiler Sizing

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

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: How do I determine my required heat output?
A: Calculate based on your building's heat loss or use 30-35 BTU per sq ft as a rough estimate.

Q2: Why 3412 as the conversion factor?
A: 1 kW equals 3412 BTU/h - this is the standard conversion between these units.

Q3: Should I round up the calculated size?
A: Yes, it's recommended to round up to the nearest standard boiler size available.

Q4: Does this account for hot water needs?
A: No, this calculates space heating only. Add 3-5 kW if the boiler will also provide domestic hot water.

Q5: What's a typical residential boiler size?
A: Most homes need 10-30 kW electric boilers, depending on size and insulation.