Another Interesting Install for a tankless water heater

So is there an issue?

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Kinda boring actually. What’s so interesting?


I guess the question is; " Is that a condensate discharge and does a dishwasher drain hose qualify for a condensate discharge drain pipe?"

Time will tell I suppose.

Yes that is the condensate drain line. It appears to be a Rinnai tankless water heater. The condensate drain pipe description is in the installation manual. The OP can figure it out. He’s MIA.

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Well, if no one else is going to do it. :wink:

Rinnai excerpt:

Condensate.pdf (322.9 KB)

Did I read something in there about plastic hose :slightly_smiling_face:

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Are we ignoring the pressure relief valve discharge piping?

What about it Ryan?

All those reducing elbows/fittings?

I don’t know if this is a new house or an old house but that insert fitting was acceptable in the IRC prior to the 2018 book.

That looks like a reduction straight from the TPRV to the pex. Is it ok?


That’s a 3/4” PEX fitting so prior to 2018 yes.

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From the Rinnai manual (can’t guarantee this is the same model though).


Maybe we just can’t see it, but a gas valve prior to the sediment trap would also be nice.

You’ll have to get with the local AHJ to see if a 3/4” PEX fitting (approved fitting prior to 2018) is restricting a 3/4” valve at the time of installation.

Cant report on what I can’t see. The elbow is blocking the view of where a gas valve is normally located.

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Drip Leg…? :stuck_out_tongue: :wink:



Here we go :slightly_smiling_face:


We call em “drip sediment trap legs” in these parts.