1. What is a Boiler Size Calculator?

Definition: This calculator estimates the required boiler size based on the number of radiators and their average output.

Purpose: It helps homeowners and heating professionals determine the appropriate boiler capacity for efficient heating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( S \) — Boiler size (kW)
• \( N \) — Number of radiators
• \( O \) — Average output per radiator (kW)

Explanation: The total heating requirement is calculated by multiplying the number of radiators by their average output.

3. Importance of Proper Boiler Sizing

Details: Correct boiler sizing ensures energy efficiency, proper heating performance, and prevents unnecessary fuel costs.

4. Using the Calculator

Tips: Enter the number of radiators and average output per radiator (default 1.5 kW). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical radiator output?
A: Standard radiators average 1.5 kW, but this varies by size and type (e.g., 0.5 kW for small, up to 3 kW for large).

Q2: Should I add extra capacity?
A: Consider adding 10-20% for hot water needs if its a combi boiler, or for future extensions.

Q3: What about room insulation?
A: Well-insulated homes may need less output per radiator (1.0-1.3 kW), while older homes may need more (1.7-2.0 kW).

Q4: How do I find my radiator outputs?
A: Check manufacturer specs or measure dimensions (typical outputs: single panel 1-1.5 kW, double panel 1.5-2.5 kW).

Q5: Does this include water heating?
A: No, this calculates space heating only. Add 3-5 kW for domestic hot water if needed.