1. What is a Hot Water Tank Size Calculator?

Definition: This calculator determines the appropriate size of a hot water tank based on peak demand and recovery rate.

Purpose: It helps homeowners, plumbers, and engineers select the right water heater capacity for efficient operation.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Size} \) — Required tank capacity (gallons)
• \( \text{Peak Demand} \) — Maximum hourly hot water usage (gallons/hour)
• \( \text{Recovery} \) — Water heater's recovery rate (gallons/hour)

Explanation: The formula calculates the tank size needed to meet peak demand based on how quickly the heater can replenish hot water.

3. Importance of Proper Tank Sizing

Details: Correct sizing ensures adequate hot water supply, energy efficiency, and prevents unnecessary strain on the water heater.

4. Using the Calculator

Tips: Enter your peak hot water demand in gallons per hour and the heater's recovery rate in gallons per hour. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine my peak demand?
A: Calculate simultaneous hot water use from all fixtures during your busiest hour (shower, dishwasher, etc.).

Q2: Where can I find the recovery rate?
A: Check your water heater's specifications or manufacturer's documentation.

Q3: What's a typical recovery rate?
A: Standard 40-gallon electric heaters recover about 10-12 gal/h, while gas heaters recover 20-40 gal/h.

Q4: Should I round up the calculated size?
A: Yes, always round up to the nearest standard tank size available.

Q5: Does this account for family size?
A: Indirectly - larger families typically have higher peak demand, which should be reflected in your input.