Limited space
We have a 1982 27' dinette model, my wife wanted the same thing and I got tired of hauling ice @2.00 per day to keep the beer cold. I installed an 11-gallon water heater in the aft portion of the starboard quarter berth. I thought of putting it in the port locker, but it would have made it real difficult to work on the inboard.I could have installed a 6-gallon in the port locker or lazerette locker, but didn't think that would last her long. I thought of glassing in the bottom of the head for a shower but I found it easier to install 4 stainless steel hooks in the cabin top and stretch 2 shower curtains in the cabin to make a square. Roll back the carpet and the water goes into the bilge. Refrigeration to convert the icebox is pricey and it is not insulated that well. I installed a NORCOLD DE0051, which works on 110 AC or 12VDC in the quarter berth facing forward.The quarter berth in the dinette model is useless except for little kids and storage, so giving it up for hot water and cold beer was no loss.Buy the way, when shopping for stainless steel fasteners, check your local Ace Hardware, ours bears the pants off West Marine