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I can't figure out what the copper pipe is, or where it comes from. All I know is that it's been dripping into the 2nd floor laundry room drain for a few weeks now. I don't think it's a/c condensation, because we haven't used the a/c in a couple of months, and anyway, I visually inspected both a/c units and they both drain with pvc pipe.
Do you have the hot water heater mounted in the attic above the laundry room? The hot water heater may be leaking into its pan and this is the overflow tube. Worse yet, this could be the blowout valve.
In either the case, you will want to replace the hot water heater pretty quickly.
PS: It doesn't really have to be mounted in the attic; if it was in an adjacent room they may have run the blowout pipe over to the laundry room.
No, the water heater is in the garage below. And the T&P valve dumps out next to the garage door. (I check it regularly). Could it be something related to the water softener?
As I can see cold water faucet is leaking.
You need to conduct an audit or replace this one.
As for the copper pipe is better to view the documentation on pipes of your home, if there is one.
I've not seen it that way but I have a pipe that supplies a few drops of water to the laundry room drain traps and to the washer overflow pan drain trap. Because those items often go long periods without regular use, the traps tend to dry out in the SW area. To prevent sewer gases from backing into the house from a dry trap, the water is trickled in. Mine is a single valve that connect to one pipe that handles the first floor and basement areas. (However, I have a third valve in the laundry connector that lets me turn the dipper off.) I bet had I not specified an air gap isolation connection, it probably would have had a void between the sewer lines and the water line. Not sure if that is what you have but it;s worth looking to see. Also, if this is a tract development, maybe one of the neighbors has it and figured it out.
I've not seen it that way but I have a pipe that supplies a few drops of water to the laundry room drain traps and to the washer overflow pan drain trap.
Totally weird.
And the pan is not plumbed correctly- it should not have a trap; and should not be connected to the DWV system.
Do you have a laundry sink? If so, does it have a pump in it? Could this be connected to the pump? My dad's house is set up something like that. (Built in 1971).
Where is your furnace? Water is a byproduct of burning natural gas. The water needs some place to go. Our boiler has a simlar open copper pipe suspended over a floor drain to allow water from the combustion to drain off when needed. This seems likely because you said it started dripping two weeks ago, which is when people (here anyway) started needing their furnace. Given the timing, it seems likely to be tied to the furnace.
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