Attach an auto air vent at the highest point on the line
air lock in hot water pipe
By installing a Hoffman #75 air bleeder up to 75 PSI.
When you cool hot air, water condenses out of it. This water should be piped to the outside of the air conditioner unit and drained away outside. It is possible that the drain pipe is blocked.
The water is probably frozen in the pipe
yes any pipe will
air lock in hot water pipe
Hot water pipe rust first as compared to the cold water pipe for the same chemical composition of the water.
By installing a Hoffman #75 air bleeder up to 75 PSI.
Cold water pipe.
There may be a small hole in the pipe causing this. The pipe may also be loose allowing air to get ?æin there.
That's just how long it takes to get the water that is sitting in the pipe out. Unless you have a circulating pump on the line so that there is always hot water at the faucet, it always takes a bit of time for the water to get hot. The hot water is in the tank, not the pipe connecting it to the faucet. There is nothing in the pipe to keep the water hot.
When you cool hot air, water condenses out of it. This water should be piped to the outside of the air conditioner unit and drained away outside. It is possible that the drain pipe is blocked.
Vent, return circulation
Check pipe size for hot water or if galvanized pipe used, pipe could be clogged inside with rust and scale.
It's condensation. The pipe dries out in use but gets very hot. When the pipe cools it draws in air from outside and any water from the air collects in the pipe; even in a couple of hours on a wintery day.
There is no special PVC pipe. CPVC can be used for hot water applications or in my opinion just use PEX pipe.
It sounds like air is in the water heater. It happens when your city water is shut down for repair sometimes and you get air in your pipes when the water flow is continued. You didn't open the valve enough or you may not have an air trap pipe.