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Storage Tank Formula:
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The Domestic Hot Water Storage Tank Calculation determines the appropriate size of a water heater storage tank based on peak hot water demand and the recovery rate of the heating system. Proper sizing ensures adequate hot water supply while optimizing energy efficiency.
The calculator uses the storage tank formula:
Where:
Explanation: The formula calculates the storage volume needed to meet peak demand when the recovery rate alone is insufficient.
Details: Correct tank sizing prevents running out of hot water during peak usage, reduces energy waste from oversized tanks, and ensures efficient system operation. Undersized tanks lead to inadequate hot water supply, while oversized tanks increase standby heat losses.
Tips: Enter peak load in gallons per hour (gph) and recovery rate in gallons per hour (gph). Both values must be positive numbers. The calculator will determine the required storage tank volume in gallons.
Q1: What factors affect peak load calculation?
A: Peak load depends on the number of occupants, fixture types, usage patterns, and simultaneous demand from multiple fixtures.
Q2: How is recovery rate determined?
A: Recovery rate is specified by the water heater manufacturer and represents how many gallons of water the unit can heat by a certain temperature rise per hour.
Q3: What is a typical recovery rate for residential water heaters?
A: Electric water heaters typically have recovery rates of 10-20 gph, while gas models range from 30-50 gph for a 90°F temperature rise.
Q4: Should I round up the calculated tank size?
A: Yes, it's recommended to round up to the nearest available tank size to ensure adequate capacity for unexpected demand increases.
Q5: Are there other factors to consider beyond this calculation?
A: Yes, temperature rise requirements, first-hour rating, energy source, and local building codes should also be considered in system design.