A general rule of thumb is that the water heater should be two-thirds the size of the water capacity of the bath. For example, a 60-gallon bath would require a 40-gallon water heater. This rough formula does not take into consideration other demands that might be placed on the water heater. We recommend that a plumber be consulted for your particular application.
Written by Kimberly GiraldoUpdated over a week ago