A water heater tank will contain approximately _____ when filled with water.

A typical residential water heater tank generally contains about 40 to 80 gallons of water, with many units falling closer to the 50 to 70-gallon range. However, larger systems designed for commercial use or larger households can range upwards of 80 gallons and sometimes even into the 100-gallon territory. In this context, the option suggesting a capacity of 95 to 100 gallons aligns with the capacity of higher-end models designed to meet greater hot water demands.

Choosing the option that cites 95 to 100 gallons reflects an understanding of the market variations in residential and commercial water heaters. While common household models typically hover around 50 to 80 gallons, it is important to note that certain higher capacity models do exist, hence why this option can be considered valid for select larger installations or specific plumbing scenarios.