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Very different from site-built

Mobile home water heaters are NOT the same as those used in site built houses; they are taller and narrower to fit in the space and maintain clearance from the walls.  They also cost more than those designed for houses so people are always tempted to make them fit.  It can be done, but an inspector who spots it will red tag it at once. It's also a fire hazard!

Many of the major home improvement centers carry mobile home water heaters.  Their prices are so low smaller retailers probably can't off nearly as good a price.