Bob:–1. Natural and LP water heaters have very different controls. Conversion is possible but should only be attempted by a really qualified gas installer. The tank dimensions are the same.2. Yes..there is a cross reference from most manufacturers that will help you select a replacement water heater with similar or identical dimensions thus making the installation much easier.3. State Industries can provide the dimensional data…they must have a web presence, but I dont know it..sorry.4. Try a search using State Industries State water heaters……….lots of luck…Bud.
