
Please add up the usages shown from the fixtures that you expect to use at the SAME time.
Normal maximum usage is one shower and one sink which totals 2.0-3.5 Gallon per minute.
Please be sure and answer this question fairly. If you must use each fixture at the same time then a tankless solution may not be for you.
We believe that the VAST majority of the time no more than two fixtures are in use at one time.
If the number reaches three fixtures at once you need a large unit and if it goes to four consistently
you need to stick with the tank product.