IMHO, having had tank-type, electric tankless, and now gas tankless, I can wholeheartedly endorse gas tankless as the ONLY way to go.
We cut our electric bill by over 40% just switching over, they are very efficient, and we have endless hot water.
They are not difficult to install, but get a good one! We have both Rinnai and Rheem units on our home and rental properties. The others, including the Bosch units are not rated as well as the Rinnai and Rheem units.
Ed
a big 'ol +1, as he hit it right on the head...
