Are you looking for a point of use ,or a whole house ? Todays heaters are much more efficiate and reliable than the older ones which is why they get a bad rap.
Rinnai is a good brand and many options. I recommend you stay away from big box stores and order on line for best pricing. I saved a lot by doing that. Got one for sister to replace a 40 year old sears gas unit. family now has unlimited water for morning showers https://www.rinnai.us/
"Lazy people think of the easy way to do the hard stuff"
It would be for a whole house. Its only me and the wife no kids so wouldnt really have a whole lot of demand. Just a shower and some dishes now and then. I heard Rinnai are good also. Im just hoping install isnt going to be to bad.