Our tankless system works well for us but we also have a storage tank with circulation pump to keep the hot water much closer to the end source. I can have all 3 showers running with someone filling a bathtub at the same time and never run out of hot water.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70