In most jurisdictions in the United States and Canada, water heaters exceeding 100 gallons, 200 MBH input, or 200 degrees Fahrenheit operating temperature must be constructed according to

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Water heaters exceeding certain limits must be constructed according to the ANSI Boiler and Pressure Vessel code, which sets out specific requirements for construction, design, and testing of pressure vessels. UL Standards and AGA Standards may also apply to water heaters, but they do not have specific requirements for larger tanks or higher input/output temperatures. United States Government Standards may also apply, but they are more general and may not cover specific requirements for water heaters.

In Most Jurisdictions in the United States and Canada, Water