Question: what is the difference between 40 and 50 gallon water heater?
Answer: A 40 gallon tank could recover in just over 1–1/2 hours more/less. ... 10 more gallons of hot water for your tub. It would take about ( pending incoming water temp) 2 hours to fully recover a 50 gallon water heater after all the hot water has been used. A 40 gallon tank could recover in just over 1–1/2 hours more/less.