1. What is a Boiler kW Calculator?

Definition: This calculator converts heating load in BTU/h to boiler power in kilowatts (kW), which is the standard measurement for boilers in the UK.

Purpose: It helps homeowners and heating engineers determine the appropriate boiler size needed for a property based on the heating demand.

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: 1 kW is equivalent to 3412 BTU/h, so dividing the heating load by this factor converts it to kW.

3. Importance of Boiler Sizing

Details: Proper boiler sizing ensures efficient operation, prevents energy waste, and maintains comfort levels. An oversized boiler cycles too frequently, while an undersized one can't meet demand.

4. Using the Calculator

Tips: Enter the heating load in BTU/h (typically calculated from heat loss assessments). The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is boiler size measured in kW in the UK?
A: The UK uses the metric system, and kW is the standard unit for measuring boiler output power.

Q2: How do I find my property's heating load?
A: A professional heat loss calculation is most accurate, or you can use our Heating Load Calculator.

Q3: What's a typical kW range for UK homes?
A: Small flats: 24-27kW, Medium homes: 28-34kW, Large homes: 35-42kW.

Q4: Should I round up the calculated kW?
A: Boilers come in standard sizes, so round up to the nearest available model.

Q5: Does this account for hot water demand?
A: No, this is just for space heating. Add 3-5kW if the boiler also provides domestic hot water.