The Legionator is a point-of-use disinfection tankless water heater meant for reducing the potential for Legionella. A set of high-quality quartz tubes heats water to a comfortable temperature when there is water demand. As the water is exiting the unit, ozone gas is injected into the water. This has two effects: it kills the bacteria in water; and the ozone is also carried in the water to the faucets and kills the bacteria present within the faucet valve seats and aerators.