1. What is a Stelrad Radiator Size Calculator?

Definition: This calculator determines the number of radiator sections needed based on the heat requirement (Q) in watts and the heat output per section.

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Size \) — Number of radiator sections needed
• \( Q \) — Heat requirement for the room (watts)
• \( Heat\ Output\ per\ Section \) — Wattage output of each radiator section

Explanation: The total heat requirement is divided by the output of each radiator section to determine how many sections are needed.

3. Importance of Proper Radiator Sizing

Details: Correct sizing ensures efficient heating, energy savings, and prevents under- or over-heating of spaces.

4. Using the Calculator

Tips: Enter the room's heat requirement (Q) in watts and the heat output per section (default 164W for typical Stelrad radiators). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I find the heat requirement (Q) for my room?
A: Use a heat loss calculation considering room size, insulation, windows, and desired temperature.

Q2: What's a typical heat output per section?
A: Standard Stelrad radiators output about 164W per section at ΔT50°C, but check your specific model.

Q3: Should I round up the result?
A: Yes, always round up to the nearest whole number since you can't install partial sections.

Q4: Does this account for different water temperatures?
A: No, output varies with system ΔT. Consult manufacturer charts for different operating conditions.

Q5: How do I convert between single and double panel radiators?
A: Double panels typically provide 1.5-1.8× the heat output of single panels at same size.