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Low boy hot water heaters are about 48 inches high. I have been searching for months for a 36 inch one for replacement. I hear Rheem and AO Smith make a 48 inch one. Good luck.

If anybody out...

The place is called MR Plumbing Supply and in Crestwood, Il. a suburb of Chgo. The phone number is 708-385-8607. They are not real prompt at returning phone calls and you have to keep after them. ...

A plumbing supply house here in Chicago said that AO Smith makes a 30 gallon low boy gas hot water heater that is 34 1/2 inches high. Quoted me a price of $350.
The Rheem model I was referring to...

I have a 20 yr. old Rheem low boy 40 gallon gas hot water heater (about 36 inches high)
In my crawl space. I've found out they don't make that size anymore in 40 gallon size-only comes in 30 gallon...