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A very common size, the 40 gallon water heater works well for 2 – 4 people. These tanks are often found in homes that have 1.5 bathrooms. If you are running out of hot water with a 40 gallon tank, it is often possible to upgrade to a 50 gallon tank without much modification. It typically requires a couple of extra inches of available width for the tank. Upgrading to a 50 gallon would likely provide about 15 gallons of additional hot water during your peak hour of usage during the day. This can go a long way towards ensuring you don’t run out of hot water. Electric 40 gallon water heaters typically have a first hour rating of 40-57 gallons. Gas 40 gallon water heaters on the other hand are in the 67-73 gallon range for their first hour rating.

Upsizing or Downsizing


Water Heater 1st Hour Rating



If you have questions about 40 Gallon water heaters, need service/repair/installation, please do not hesitate to contact us!