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Air in hot water line

How to remove air in water lines.. I guess it is in cold but because it is not heated it doesn't burst out of fixtures. Want to know how to eliminate.

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Turning water on for a extended period of time should eliminate air in the line. If not then there is probably a leak allowing air to get in.

Posted on Jun 03, 2014

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Posted on Jan 02, 2017

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How do I turn a hot fixture to a cold fixture?


Look at the piping to each fixture. If they are flexible lines you can easily swap them after turning off the water supply. The fixtures themselves are the same so that is not a problem. You can choose to make the swap at the shut-off valves or at the fixture which ever is most convenient. If the lines are the solid copper type you can bend them around to do the job if they are not to short. If line length is a problem I recommend replacing one or both with the flexible type from Home depot or wherever. The type that looks like braided stainless steel is best. Rubber hoses will end up making your water taste funny.

Nov 15, 2014 | Water Heaters

1 Answer

After hot water demand, burner stays lit, blew up Pex supply line


Thermocouple has 2 ends. One end attaches to gas control valve, other end sits inside the pilot flame.
Flame heats thermocouple, causing tiny electrical current that is detected inside the gas control valve and keeps the gas valve open so water heater can turn on when thermostat calls for heating.
If pilot goes out, then no electric current reaches gas control, and all gas to burner and pilot is shut off.

If pex line burst, that implies very high pressure, caused by closed system with check valve that stops expansion, or possible clog in the water line, or high local water pressure, or clogged factory-installed heat traps.
Put pressure gauge like BTG100 on the drain valve to check pressure, should not exceed 80psi, install pressure reducing valve on cold water line, install expansion tank on cold water line. Remove heat traps and install ordinary pex-lined di-electric nipples from hardware store.

If the water was super hot, then overheating could have caused the pipe explosion.
However the gas control thermostat is ECO protected, and if ECO (energy cut off) trips because of high heat detected inside the tank or combustion chamber, the gas control will trip off and no longer work, gas control needs to be replaced. Some newer electronic gas controls can be reset, but that type heater uses a thermopile instead of thermocouple.
Thermopile is basically a group of thermocouples, that product more electric current that is used to power electronics inside the gas control valve, which issues an error code on the gas control, and some day will send a text message each time out-of-range event occurs.

Copy following links for troubleshoot resources, including troubleshoot by type of gas control valve:
http://weaterheatertimer.org/How-to-troubleshoot-gas-water-heater.html
http://waterheatertimer.org/Low-hot-water-pressure.html
http://waterheatertimer.org/pdf/How-to-replace-water-heater-gas-valve.pdf

Jul 12, 2012 | Bosch Aquastar 125B Gas Valve NG - Part...

1 Answer

Hello, I recently had a Rinnai tankless water heater installed. The old water heater was in the garage. The new tankless heater is installed outside, and is about 25 feet away from where the old one...


I agree with you. The foam insulation should only be on the Hot Water side. The cold water side doesn't make any difference, as that temperature rarely changes in California.

Hope this helped you AK, thanks for choosing FixYa.

Aug 10, 2011 | Heating & Cooling

1 Answer

SINGLE VALVE SHOWER FAUCET TURN ON TO GET HOT WATER ONLY GETTING WARM WATER LUKE THE OTHER TUB AND SINK FAUCET COME OUT HOT HELP PLEASE


I can think of a few possibilities. 1) Something is blocking the hot water in to the mixing valve. Fixing this would probably mean cutting out the valve (then redoing the water lines with a new valve (possible option)).

2) The hot water line is losing too much heat going to this second faucet. (If the two tubs are on different floors this is more common. Many places are plumbed with one line with Ts to all fixtures.) Insulating the water lines might help; alternatively an point of use water heater would help.

3) The hot water and the cold water in are reversed. (Test by leaving the water on full cold and full hot for a few minutes each.) If you get full hot when it should be cold, valves with a cartridge are easy to fix. Open the valve assembly, remove the cartridge and reinsert it after turning it around (side closest to you when you removed it goes in first). Otherwise, the incoming plumbing needs to be redone at the point where the cold and hot lines come into the shower.

I hope this helps.

Cindy Wells

Dec 15, 2010 | Price Pfister Home

1 Answer

Hot water very slow running .cold works fine


Is this problem at every fixture or just one location If it is at every fixture then I would shut water supply valve off to water heater and turn control valve to pilot if gas or shut breaker off if electric. Disconnect piping on hot water side of water heater and see if there is a rust or mineral build up at this point. If so clean thourghly and reinstall piping or replace as needed. Remove aerators from each faucet one by one and flush lines. Both hot and cold. Replace aerator and continue untill you have flushed all lines including outside silcocks.If your problem is more isolated please tell me where and what type of fixture you are having problems with and I will try to help you. Thanks

Dec 05, 2010 | Heating & Cooling

1 Answer

I am trying to find out why the cold water line leading out of the WH unit is sometimes hot but no hot water coming out of the cold water faucets in the house and sometimes there is no Hot water in half...


Believe it or not one of the sink or shower fixtures is by-passing when closed.Gravity circulation in standby mode(not being used) is the cause.Trace the (warm )cold water pipe to the fixture after no one uses the water for a while.Good luck.

Sep 23, 2010 | Rheem 81VP6S/430126 Water Heater

1 Answer

I HAVE HOT (WARM) WATER IN COLD LINES, ESP., THE TOILET 1ST FLOOR, also, I never get very hot water.


Hello,You have a bad faucet/fixture somewhere in the house.The water is by-passing thru gravity to heat up the cold water pipes&toilet when not in use.

Jan 20, 2010 | Grundfos Comfort Series Replacement Valve

2 Answers

I have Moen sink faucets in 4 baths. In one bath


How often do you use that faucet? If not used often you might just "work" that valve every two or three weeks to prevent the standing water from doing its deed.

Sep 02, 2017 | Plumbing

2 Answers

We have a customer that has a 751od who says at times thier water gets cold for a few seconds. No error codes on the remote. They claim it does it at different fixtures. Everything checks out from water...


A few things you should check:

1. Cross Connections - this occurs when cold water leaks into the hot water system through a fixture. In order to check for a cross connection: 1) turn off the cold water to the tankless 2) open up hot water fixtures in the home. The water should shut off at all hot water fixtures; if there is a continuous flow of cold water, then you have a cross connection. The most common place to find a cross connection is on old shower cartridges.

2. Ask the customer to check to see if the burner indicator is continuously lit during operation.

3. When the water goes cold at one fixture, try another near by fixture to confirm it is also cold there. If its hot at one fixture but not the other, then you have some issue with you plumbing. Tankless heaters can't pick and choose which fixtures to deliver hot water to.

4. Tankless water heaters all have a minimum flow rate that must be maintained in order to continually fire (.5 gpm for Noritz). Ensure their hot water fixtures flow at least this amount, or that the customer isn't mixing too little hot water at their fixture.

5. If they see the cold spurt during initial firing, they may be experiencing a cold water sandwich. When the heater moves from a standing state to a firing state it takes a short period to ignite and heat water. During this time it will be passing cold water through the system. Usually this cold water mixes with hot water in the line as it travels through the plumbing system, but if their fixture is very close to the heater, there won't be enough time to mix.

6. If debris has gotten into the flow sensor, this can prevent the unit from registering flow and cause intermittent firing.

Aug 27, 2009 | Noritz 7.1 Gpm Natural Ng Gas Tankless Hot...

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