The big familiy at one home, need hot water more than you who stay alone at your condo or apartments. A small house tankless water heater cannot fullfill their needs. You should consider wholehouse type of water heater.
One of them is come from BOSCH, they are produce best tankless water heater since a long time ago. You can count on their product to supply hot water through all pipes system inside your house. This product also have a high efficiency level that bring you more benefit with cutting the electricity or gas bill in your monthly payment. You can check vinitankless site to get more detail. This product is great right?