Water heaters

When I bought my current house 10 years ago, the old water heater was pushing 20 years old. I had a tankless NG unit installed, yes it was a little pricey at around $3500.00 but it has been virtually trouble free, never run out of hot water. The house has 2 full bathrooms, only my wife and I living here, but no complaints. Had one issue with the unit about 5 or 6 years ago with something in the control panel not making it hot enough, otherwise it has been great. Had it cleaned/serviced once since then, next time I will try and do it myself.