How long to heat 10000 gallons of water to 72 degrees?

The time required to heat 10,000 gallons of water to 72 degrees Fahrenheit depends on several factors, including the starting temperature of the water, the power of the heating system, and heat loss during the process. For example, if you're using a heater with a capacity of 100,000 BTUs per hour and starting from 50 degrees, it would take roughly 5 to 6 hours to reach the desired temperature. However, this is a general estimate and actual times may vary based on efficiency and environmental conditions.