Ive installed a few tankless, so not a expert on them by any stretch. I do know that most who have inquired on them seem to want the cake and eat it too in that they still want recirc systems for that far off bathroom. In my mind a tankless means just that. Isnt having a tank for them reverting back to the old school models? And I dont get how you would recirc them anyway. Our New Mexico water laughs at softeners, copper, or brass fittings. So I'm not sure of all the buildup as mentioned earlier in this thread. Last but not least the sensors, limits etc. But in all fairness the costumers I know that have them love them.:yes: