In the past water heaters could store as much as 20-80 gallons of water at a time. Storage water heaters heated cold water at the bottom of the tank and sent hot water out of the top. Innovations in water heaters have done away with the need for massive amounts of water storage. The water heaters used in today's homes are tankless water heaters - meaning they don't have storage tanks. Tankless water heaters create hot water on demand with no need for stored water. Tankless water heaters are available in solar, demand and indirect models. Solar water heaters draws energy from the sun to heat water for your showers; with demand water heaters the water is heated by a burner as it travels through a pipe; indirect water heaters heat water inside a boiler. Tankless water heaters range from $500 to $700 online.
