How long does it take to install a 40-gallon hot water heater? The installation of a 40-gallon hot water heater typically takes two to three hours for an experienced professional. Is a 40-gallon ...

This means walk-in tubs require a lot more water to fill. If your water heater has a 40-gallon tank and you have a 50-gallon tub, your hot water might run out before you’re done filling the tub.

Commissions do not affect our editors' opinions or evaluations. Finding the best water heater for your home can come down to several factors such as cost, energy use, fuel type and preference.