Bests & Worsts Reviews from Amazon

We installed an R75l for propane just about 4 years ago. It's just my wife and me, so we don't use an excessive amount of hot water. We also have softened well water. The unit worked fine for 2 years, then began to act flakey. Hot water would cut out, the flame would go out, or there would be wide temperature variations. We tried finding a 'certified Rinnai technician.' Well, there aren't many in my area. One of them wouldn't even talk to me because I wasn't one of his gas customers. I finally did get one guy who visited twice, didn't solve the problem and refused to come back. My gas company, while not on the Rinnai list, does have some experience and managed to fix the problem - also in two service calls. It involved basically taking the thing apart and resetting all the sensors. That was just about a year ago. All was well until last week and now it's doing it again. So, we're going for week without hot water. So it's looking like I have to put at least 300 bucks a year into this thing for maintenance. That's in addition to flushing out the unit yearly with vinegar, which is thankfully something I can do myself - involves pumping 4 gallons of vinegar through the thing for 45 minutes. I'm looking forward to getting rid of this thing when I change my heating system, but for now I'm stuck with this thing. Oh, an Rinnai customer service? Very nice folks, but totally useless. The problem is NEVER the unit - it's the water, it's the gas/water pressure, the gas company's fault...etc. So....if you're looking at this, talk to your gas supplier, talk to your plumber. See how many people in your area can service this thing before you sink your cash into it. By the time I can change this out, I will have paid for it again.