1. What is a Hot Water Cylinder Size Calculator?

Definition: This calculator determines the appropriate size for a hot water cylinder based on the number of occupants in a household.

Purpose: It helps homeowners and plumbers select the right water heater capacity to meet daily hot water demands efficiently.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Size \) — Recommended cylinder capacity (liters)
• \( Occupants \) — Number of people in the household
• \( 45\,L/person \) — Standard daily hot water usage per person
• \( 25\,L \) — Base capacity buffer

Explanation: The calculation accounts for typical residential hot water consumption patterns and adds a safety buffer.

3. Importance of Proper Cylinder Sizing

Details: Correct sizing ensures sufficient hot water supply while maintaining energy efficiency and preventing unnecessary costs.

4. Using the Calculator

Tips: Simply enter the number of people living in the household. The calculator will recommend the minimum cylinder size in liters.

5. Frequently Asked Questions (FAQ)

Q1: Why is there a 25L buffer in the formula?
A: The buffer ensures there's always some hot water available and accounts for heat loss in the system.

Q2: What if we have high hot water usage?
A: For homes with baths, spas, or high usage, consider increasing the result by 10-20%.

Q3: Does this work for tankless water heaters?
A: No, this calculator is for storage-type water heaters only.

Q4: How does this compare to shower usage?
A: A 7-minute shower uses about 45L, which aligns with the per-person calculation.

Q5: Should I round up the result?
A: Yes, choose the next available standard cylinder size above the calculated value.