There is no sense in heating gallons upon gallons of water all day every day just so you can use it for a shower or a quick rinse of the dishes. It burns up your piggy bank and fuel to no useful end. Tankless water heaters are commonplace in many parts of the world and make sense (and cents!) nearly everywhere for domestic use. The heaters use electric heating elements to regulate water temp as it passes through the system coils for your use rather than sitting idle in a holding tank like common household hot water heaters. These systems can be from point of use units in your shower to household level heaters supplying hot water wherever you need it. Tankless systems can cut your water heating energy consumption by up to 50% while maintaining outflow rates that you require for showering, washing, or whatever.