direct water heater

direct-fired water heater

A water heater in which the source of heat (gas, oil, or electricity) is located at the water tank–in contrast to an indirect water heater.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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In other cases, it could be that the site doesn't have very many hand wash basins, which lends itself to the installation of direct water heaters. Regardless of the circumstances, it's important to look at the full plant requirements, as well as whether or not the site has the potential for a packaged boiler house.