10/20/2026
In the federal government's 2020 home energy survey, about 3.14 million rented U.S. homes had a main water heater 20 years old or more. The ones still in place are older now.
If you manage units, walk the closets and note tank ages before a ceiling downstairs tells you.
Source: U.S. Energy Information Administration, 2020 Residential Energy Consumption Survey, Table HC8.2