Reply To: Hydro Neumatic Tank(Waterpressuretank)

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Avatar photoJerry Peck

    First, someplace on the water heater it should state how long the warranty is or when the warranty expires.

    If the warranty period is 5 years, you are probably out-of-warraty. If a 10 year warranty, you are probably in-warranty.

    That depends on the following: the typical way to read a serial number (with a number like yours) for the date of manufacturer is like this is – the first four digits are the week and year or year and week. Thus your serial number, Serial#089125045, would be the 8th week of 1991.

    Different brands use different codes, however, your s/n date code fits that format.

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