Tankless Water Heater Flush: DIY or hire plumber?

If your heater was installed with a flush valve kit (it should be) and it it's mounted on the exterior of the house then it's a really easy job and the stakes of making a mistake are very low (they're a bit higher if the heater's in the attic). It's a really easy job and nothing anyone who can turn a few ball valves and can't handle.

A plumber will likely cost you $150-250

Mine's in the attic. I'm thinking water leaks are all that could go wrong right?

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"three fiddy"

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It's "tree fiddy"

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I have two tankless water heaters, wasn't aware they need to be flushed. How often?

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I think Rheem recommends (and may require it to be) at least once a year. The type of water you have makes a big difference in how necessary it is though. If you have really hard water that builds up a lot of scale then you may need to do it more often.

I have done mine a few times. It's very easy and the most time consuming part is letting the pump run for an hour. I haven't had any problems with mine but most people never flush them and I have had multiple neighbors have the igniters go out in the past few months after 6 years of operation.

It's easy. Do it.

Do it myself. You basically set it up, make sure it is working right and then come back in an hour. It is something like 5 minutes of actual work.