Storage tank water heater leaks can be expensive
It has happened to all of us that we ran out of hot water taking a shower or a bath. And there is no quick heat up of the water. The water heater is just not designed for that and it takes a lot of energy and time again to heat 40 or more gallons of water. A lot of families have to schedule their showers because in a household with multiple persons you quickly run out of hot water.
To make that hot water last a bit longer you can run the water heater at a higher temperature; say 180 degree Fahrenheit so that you mix more cold water with the hot water. Running the water heater at higher temperature wastes even more energy and with it of course money. Typically people take showers in the morning before leaving home for work.
 HHP HH28 Tankless Water Heater Whole House US $704.95 
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 HHP HH12 Single Shower Tankless Water Heater US $412.47
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 Stiebel Eltron Tankless Water Heater Tempra 12B US $435.00
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 NEW NAVIEN NR-180A NATURAL GAS TANKLESS WATER HEATER US $1,129.88
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The water heater is not intelligent to know that after the shower you all leave the house and won’t be needing hot water until later in the afternoon when everybody gets home again. So it heats up the water again and keeps it hot all day long by heating and heating it again and again. And of course it doesn’t know that you won’t be needing hot water after taking shower and going to sleep, so it heats up the water again and keeps it hot during the night.
Well, the other issue with tank water heaters is that they tend to leak water over time. Sometimes this happens for a long time without being noticed. Since most water heaters are placed in the garage they are usually out of sight and nobody pays attention to them. So water damage because of a water leak can go on for a very long time unnoticed and cause considerable damage to the home and surrounding in addition to wasting water and energy. Water damage to subfloors or other structures of homes is not uncommon and the repair of it tends to be costly because it wasn’t detected early.