1. What is a Boiler Size Calculator?

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

Purpose: It helps homeowners and heating engineers select the correctly sized boiler for UK properties.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Boiler size in kilowatts
• \( Q_{btu} \) — Heating load in BTU per hour

Explanation: The formula converts British Thermal Units to kilowatts using the conversion factor 3412 BTU/h = 1 kW.

3. Importance of Correct Boiler Sizing

Details: Proper boiler sizing ensures energy efficiency, reduces operating costs, and extends equipment lifespan while providing adequate heating.

4. Using the Calculator

Tips: Enter your property's heating load in BTU/h. The calculator will output the recommended boiler size in kW.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my heating load?
A: A heating engineer can perform a heat loss calculation, or use our Heating Load Calculator tool.

Q2: What's the average boiler size for UK homes?
A: Typical UK homes require 24-30kW boilers, but this varies by property size and insulation.

Q3: Why is boiler sizing important?
A: Oversized boilers cycle on/off frequently reducing efficiency, while undersized boilers can't meet demand.

Q4: Does this include hot water requirements?
A: This calculates heating needs only. For combi boilers, add 3-5kW for hot water capacity.

Q5: What if I have an older property?
A: Older, less insulated homes typically require 10-20% larger boilers than the calculation suggests.