Cross-posted in plumbing....

I have a Navien tankless that is 2 years old. Our water is probably a little on the hard side. My neighbor, who is a plumber, also has one of his own. He told me he had never flushed his (this was after owning it for 2-3 years I believe). I think it would be a good idea to do.

I'm not asking him to do it because he never lets us pay him and we aren't that close of friends. I will call him in a pinch but not for every little thing, plus he's never done his own!

I called the people who installed it. They want $215 to do it! Ouch!

It looks pretty straightforward. I just need to get a sump pump, hoses, bucket and vinegar.

Can I mess this up? For the $215 it is surely something I need to learn to do because I am NOT paying that every couple of years if I can do it.

So, has anybody done this. Any tips? Thanks.