A Bosch Tankless Water Heater heats your water on demand instead of continually heating and storing a large amount of water in a traditional hot water heater. Tankless water heaters are gaining popularity in Ventura County due to their small, compact design and energy efficiency. The Bosch Tankless Water Heater generates hot water immediately when you open the hot water faucet. The unit then turns itself off when the faucet is closed; saving energy costs over the entire lifetime of the unit. The energy consumed is only for heating the water which is needed for that specific usage.