1. What is a Stelrad Radiator Size Calculator?

Definition: This calculator determines the number of radiator units needed based on room heat loss and the output per radiator unit.

Purpose: It helps homeowners and heating engineers properly size radiators for efficient room heating in UK homes.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( S \) — Radiator size (number of units)
• \( H \) — Heat loss of the room (Watts)
• \( O \) — Output per radiator unit (Watts/unit)

Explanation: The room's heat loss is divided by the output of each radiator unit to determine how many units are needed.

3. Importance of Proper Radiator Sizing

Details: Correct radiator sizing ensures efficient heating, prevents energy waste, and maintains comfortable room temperatures.

4. Using the Calculator

Tips: Enter the room's heat loss in Watts and the output per radiator unit (available from manufacturer specifications). Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine my room's heat loss?
A: Use a heat loss calculator or consult a heating engineer. Factors include room size, insulation, windows, and outside temperature.

Q2: Where can I find radiator output specifications?
A: Check Stelrad's product documentation or their official website for BTU/Watt ratings of specific models.

Q3: Should I round up the calculated size?
A: Yes, it's recommended to round up to the nearest whole number to ensure adequate heating capacity.

Q4: Does this account for different radiator types?
A: No, you must use the correct output value for your specific radiator type (single/double panel, finned, etc.).

Q5: What about rooms with multiple radiators?
A: Divide the total heat loss by the number of radiators you plan to install before using the calculator.