Clark® Water Heaters

The date of production/manufacture or age of Clark® Water Heater(s) cannot currently be determined from the serial number. Other clues or indicators must be used.

Serial number styles/formats found are:

Style 1: 7X60633

Style 1: 7X60633

Last manufactured in 1974.

Unfortunately we are unable to determine the exact date of manufacture or age of these units.

Research Notes:

McGraw Electric acquired Clark Water Heater Company in 1927.

The McGraw Electric Company was a U.S. manufacturer of electric appliances founded by Max McGraw in 1900. It grew through mergers and acquisitions to become a major enterprise. The best known product may have been the Toastmaster pop-up toaster.

In 1957 McGraw Electric merged with Thomas A. Edison, Inc. to form McGraw-Edison.

McGraw-Edison brands were last manufactured in 1974, and no longer in business.

Because the data plate pictured below lists the parent company as McGraw Electric Company rather than McGraw-Edison, the manufacture date of this unit likely predates the 1957 merger.


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Every effort is undertaken to offer you correct and concise information to assist you in determining the age or manufacture date of water heating equipment. Anytime anyone is dealing with numbers and letters in determining data, mistakes and misinterpretation are bound to happen. For this reason if you find during your research that we may have erred please contact us. In addition perhaps you have come across a brand, model or serial number format that we have not addressed. Contact us with your concerns or new submissions. Please include all pertinent information including clear and legible pictures of data/nomenclature plates.