When I proposed their use to my plumbing contractor, he said he has had very poor results with these to date, and in fact has replaced some tankless units with conventional tank heaters.
I've got natural gas available to me. The big issue I have is there is a pretty large distance between the wing of the house with the bedrooms/baths (major hot water need) and the other wing which has the laundry room/kitchen/guest bath. I was thinking about putting 2 tankless heaters, 1 for each wing of the house.
Anyone have any comments on how these heaters work in the real world?