The most talked-about type of water heater is the tankless orinstant water heater. The tankless heater does not have a reservoirof water to keep heated constantly. It heats the water as it isneeded.If you’re like most folks, You want hot water that is fast andplentiful. You want a heater that heats quickly without costing afortune. You expect your heater to be robust enough to take ashower while the dishwasher is running. For these reason, atankless water heater falls short.The up-front cost is the first consideration. A 40-gallon tankheater only costs about $800 installed. A comparable tankless waterheater can run $3500 or more after installation, depending onwhether your new heater fits your old fittings.Another consideration is the level of use. Unless you buy a veryhearty tankless heat