Fredericksburg Gold and Pawn 5403717800 has two instant electric water heaters for sale. New in the box, never used.
Chronomite model SR-30L-/120
Please call and ask for Miguel or Diego
From what I have heard the electric ones are not very efficient unless you get into 220 models. I have a propane Fastair unit on the tongue of our Boler and it is great including for hot showers, cost me $80 on eBay new.
1971 Boler 1300 - "Suite 13"
1987 Play-Mor II - "The Beach House"