Water Heater Sizing Calculator
Determine appropriate water heater capacity based on occupancy and usage patterns
ASHRAE Service Water HeatingIPC 2021 Chapter 5
Enter values and click Calculate
Determine appropriate water heater capacity based on occupancy and usage patterns
Estimate maximum simultaneous usage during busiest hour (typically morning)
20 gallons each
36 gallons each
6 gallons per load
7 gallons hot water per load
Enter values and click Calculate to see results.