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It probably runs near a heat vent and the water warms up when it's just sitting in the pipe. It will probably cool after you let it run for a while and start bringing in the water that was outside, underground. Depending on your area, underground water seeks ground temperature and that's what you should be getting after you let the water run for a little.

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Q: What could cause warm water to come out of the cold water side of a faucet?
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Related questions

Can hot water bleed into the cold water line through a sing handle shower body?

Yes, it can also cross through a two handled faucet. Both the hot and cold sides of the faucet must be on and the flow of water must be stopped or greatly reduced on the outlet side of the faucet. This can occur when a hose with a spray nozzle is attached to a laundry tub faucet with the faucet on and the spray nozzle off, or when a shower faucet is on but the shower spray head is off. When another cold water outlet in the system is turned on then the pressure on the cold side of the laundry tub or shower faucet in question could be lowered below the pressure on the hot side and hot water can flow into the cold water side. There are faucets which have integral check valves which prevent this from occurring. WWW.WOODBRIDGEPLUMBING.COM


Can a hot water heater siphon to cold water faucet?

Yes


The valve in the faucet?

cold water tub facuet is corroded bye hard water builtup and needs to be replaced. Hot water is okay. Its the right one with the cold water coming out


Do you use the water heater when you use just cold water?

If water is only drawn from the cold faucet, then no, the water heater is not involved. However, if water is drawn from the hot faucet- even for a few seconds- hot water IS withdrawn from the heater, and fresh cold water drawn in to be heated- even if the hot water did not make it all the way through the pipe to the faucet- and the water heater will work to heat that fresh cold water.


Why do you have no cold water in cold weather?

If you have nothing coming out the faucet, your lines are probably frozen somewhere. The lines could develop leaks, so be watchful when they thaw.


Is it true or a myth that you have to use the cold water faucet to pour water into a pot to boil?

true, the water is going to get hot either if you use cold or hot water You did not answer my question of if it was "true" or a "myth" that the water had to be from the cold water faucet. From what you did respond to it sounds as if the question I generated means it is a myth that the water "has" to be from the cold water facuet.


How do you get rid of calcium build-up in the copper cold water line if it has caused the cold water bathroom faucet to slow to a trickle?

its not the co.pper line its the faucet stem or angle stop


What is the meaning of sink faucet?

The part the water pours out of, usually activated by a lever in houses (perhaps one for cold water, one for warm water) and sometimes in public bathrooms. However, it is common for restaurants to have automatic hand sensors that generate the faucet. Otherwise, you could look "faucet" up in a dictionary.


How do you connect the sprayer to the hot and cold water?

Kitchen faucet? If so, the sprayer attaches to the underside of the faucet in the middle.


What causes high water pressure in the first faucet on the water line from where it enters the house. The cold water is under high pressure but other faucets in house are fine.?

Possibly a pressure reducing valve installed after piping for first faucet, which would cause situation describing.


When using hot water it goes cold when a cold water faucet is open?

because there no backflow perventer on laves and toilets


Why does the water from your cold faucet not get cold in a newly constructed home even if the hot water has not been on?

Possibly a cross connection