I currently have a Navien tankless water system and have no major complaints at all. It has a recirculating pump and circulates the water throughout the day so we never have to wait more than 5-10 seconds for hot water at any tap within the house (2 storeys). It also has a LCD control panel on the unit which controls the temperature. I believe it goes up to a max of 140 degrees but we set it to 120 which is more than fine for our family.
The only thing that drives me nuts is the yearly maintenance service costs to perform a flush on the unit. It is a simple process but needs to be done by a professional, otherwise it voids the warranty. The cost for me is $349.
I tried calling around to see what various plumbers charge to perform a unit flush but none of the big plumbing companies in Calgary will touch the unit because it wasn't installed by them. Everyone says the same thing. It must be performed by the original installer.
This should be factored into the decision making process before you purchase one.
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