A steam water heater is an appliance that uses incoming steam supply to warm a water supply. It is a form of on-demand water heating that does not require a bulky storage tank, like traditional gas-fired or electric water heaters.
The steam water heater system consists of two major components: a heat exchanger and a blending valve. The interaction of these two components provides instantaneous and continuous hot water, given a steady supply of steam and inlet water.
The heat exchanger has inputs of steam and cold water that enter and stay separate via a coil or pipe system. The thermal difference of the two increases the temperature of the water, which is output to the blending valve. The thermal decline of the steam causes it to condense into water, which is then drained out.
The blending valve mixes cold and hot input water, gauging temperature with a control rod. This device changes the mix depending on the water temperature demand of a household. After mixing in the valve, the water is shunted out to be dispensed by a building's faucets and appliances.
The major advantage of a steam-water heater system is that it provides fast, energy-efficient hot water with a minimal amount of floor space. One major requirement is a significant amount of steam to use. Brands such as Hubbell and Leslie Controls manufacture steam water heater systems.