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Water Heater Capacity Formula:
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Water heater capacity calculation determines the appropriate size of a water heater based on peak hot water demand and the required duration of supply. Proper sizing ensures adequate hot water availability while optimizing energy efficiency.
The calculator uses the water heater capacity formula:
Where:
Explanation: This formula calculates the minimum water heater capacity needed to meet peak hot water demand over a specified duration.
Details: Correct water heater sizing is crucial for ensuring sufficient hot water supply, reducing energy costs, extending equipment lifespan, and preventing unnecessary strain on the system.
Tips: Enter peak hot water demand in gallons per hour and required supply duration in hours. Both values must be positive numbers for accurate calculation.
Q1: What factors affect peak hot water demand?
A: Peak demand depends on the number of occupants, simultaneous appliance usage, fixture types, and usage patterns in the household.
Q2: How do I determine my peak hot water demand?
A: Calculate by adding the flow rates of all fixtures that might be used simultaneously during peak hours, or use standard consumption estimates.
Q3: What's a typical duration for water heater sizing?
A: Duration typically ranges from 1-4 hours, depending on usage patterns and recovery rates. Many systems are sized for 2-3 hour peak demand periods.
Q4: Should I add a safety margin to the calculated capacity?
A: Yes, it's recommended to add 10-20% safety margin to account for variations in usage and future needs.
Q5: Does this calculation work for both tank and tankless water heaters?
A: This formula is primarily for storage tank water heaters. Tankless systems are sized based on flow rate and temperature rise requirements.