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Old 10-09-2016, 12:40 PM   #1
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Condensate drain to washer stand pipe?


I would like to connect a condensate line from a new tankless water heater and gas furnace to a washer stand pipe. Is this okay?

I was planning on adding a wye to the vertical standpipe just above the trap, and then use a threaded bushing to convert to the PVC condensate line. Does it matter if I install the wye as close to the trap as possible? I would like to get as much slope on the condensate line as possible.

Do I need to increase the size from 3/4 to 1" since I will have the tankless water heater condensate, furnace condensate, and maybe a humidifier all connected?

Thanks!
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Old 10-09-2016, 04:35 PM   #2
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Re: Condensate drain to washer stand pipe?


Had mine similar idea for a long time. But because condensate runoff from furnace and heater are somewhat acidic, better to add wye further down so washer (used on a regular basis) can flush the line and keep it PH balanced.

If yours will get that flush, probably ok.
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Old 10-09-2016, 06:04 PM   #3
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Re: Condensate drain to washer stand pipe?


Depending on how acidic they are you would want to run them through a neutralizer otherwise you are running acid through your drain system. In many areas these are required by code, I don't know the code for your area so you would have to research that yourself.
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Old 10-09-2016, 06:07 PM   #4
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Re: Condensate drain to washer stand pipe?


Neither idea is legal or recommended. If you pump condensate up to the top of washer drain pipe, you can run the condensate in to the pipe by using an air gap mounting. If you have PVC drain pipe, no worries on PH of condensate. NO WYE, you really don't want to do that.

Last edited by SHR Plumber; 10-09-2016 at 06:16 PM.
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