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Hot water heater water, went out main line of house that enters house

The county water supply had a main break this morning. My house sounded like water was running with leaks all over the house. I ran around checking. My in water line from the street into my house was very HOT. My house was sounding like it was going to blow up. I went and turned the gas off the hot water heater. Turned off the main line in my house from outside. Then I went outside and turned off the water at the meter underground. Talked to neighbors, some were having the same thing going on. They all decided to do as I did and cut the water off and the gas to the hot water heater off. My question what happened and how dangeous is this if I was not home and I assume it was sucking the hot water heater empty and it was still heating the tank. Would the tank blow up or damage my pipes. About 15 years ago a water break happened from the county. When they turned the water back on I had to replace all the cartridges in my sinks etc. and dig up my front yard as it blew up the underground (my line) where is was contacted near the house. They blew so much air into my pipes with debris that it was very costly on my part. What would have happened if I had not cut stuff off? How can I fix this so this will not happen again? What if I am not home if it happens?

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  • Whirlpool Master
  • 5,089 Answers

You did smart thing turning off water and gas.
Play it safe.

Your water heater will NOT explode.
Conduct routine maintenance so water heater lasts longer. If plumber says you need new heater, then post question on fixya and include information showing on tank label on side of tank.
Also include why plumber says to replace.
Get another plumber.

Call city utility company to determine source of noise.

Posted on Dec 03, 2012

6 Suggested Answers

6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

SOURCE: A.O. Smith Water Heater Problems

ok here is how a heater works - there is a high setting cut out and a low settin cut out. The cycle is as follows. The water heater first heats to a preset temperature , say 120 degress. You draw water and the temp in the tank drops to say 90 degrees at which point it fires again- sensing that if it doesn't you will run out of water.I think that this setting has been set too low to say 75 degrees and you get cooler water because the heater cannot catch up. You must find this control in book at set the differential to twenty degress.This will stop you from running out of hot water.Just for the record less reputable companies will do this on purpose over a coulpe visits adn tell you the heater is failing and must be replaced. Get a book. In the mean time I need your model # so I can find this setting for you.Wait to hear from you. Allen

Posted on Oct 31, 2008

WhiteRussian
  • 167 Answers

SOURCE: Parkray Cumbria efficiency problem

Some circulation pumps have a 3 phase mixing valve (cold,warm,hot) to regulate the water pressure in the building; no way to know unless you trace the plumbing. Basically, the hot water temperature could be lost because the circ-pump is cooling it with the cold water supplied to it. This is used to balance the pressure (aka Pressure Balancing Circ-Pump), so heater is really working overtime to heat the water. If the pump has two in and one out that's more than likely your problem; but you should consult a "old-school" plumber in your area.

Posted on Nov 28, 2008

  • 1 Answer

SOURCE: Water is either hot or cold - no in between.

I found a way to get warm water in the shower, but I'm not sure it qualifies as a solution. After trying everything else I thought that maybe when I was feathering the faucet in the shower toward the cold side so I would get warm water that at a certain point it blocked the flow on the hot water side enough so that the sensor in the hot water heater sensed there was no demand in the line and it shut the water heater off. To test this, I went to the kitchen and turned the kitchen sink faucet all the way to the hot side and then turned it on so that I got a small flow of water. I waited for the water to get hot to be sure the hot water heater was working. Once it was hot, I left it running to keep demand in the line and then I went to the shower and turned the faucet on. When the water got hot I started feathering the control towards the cold side and soon I had warm water. So I think I'm right in that the sensor in the hot water heater was shutting the water heater off when the demand in the shower was lowered to a certain point when I was trying to adjust the water temp in the shower.

So now I can get warm water, but it means I have to leave the hot water running at another fixture in the house to create a false demand in the system so the hot water heater doesn't shut down. Is there a way to adjust the senor in the hot water heater so that it will stay on when I'm using the shower only, so I don't have to waste water by running another faucet when I want to take a shower?

Posted on Nov 29, 2008

  • 1 Answer

SOURCE: water doesn't stay hot PowerStar AE3.4

Are you using a single lever faucet? The install guide does indicate that you may need to reduce the input from the cold water side to ensure that water stays at a consistent temperature (see page 7 of the installation and service manual). Also, remember, this is a SMALL hot water heater. So if you're running for any length of time at full output, it may not keep up with you (see page 8 of the service an installation manual). I found the manual online at http://www.airwater.biz/images_templ/bosch-water-heaters-ae3.4-manual.pdf.

Posted on Feb 01, 2009

rick_stokes_
  • 61 Answers

SOURCE: No water pressure in bath tub after turning off hot water heater

It could be back flowing into the hot water heater tank which is not full because of the leak. Even though the valve is closed on the cold water entry side, there is probably no valve on the exit side. That is how it is returning to the tank.

Posted on Sep 19, 2009

Testimonial: "Thank you very much, Rick! "

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I am putting a new hot water heater in and the cold line has no got no water coming out of the line at all it the only time it


It sounds as though you need a plumber...

It sounds as though the cold water feed pipe is a low pressure supply from a storage tank (rather than the mains) and something has become blocked or displaced.

The pipework needs tracing to locate the fault and rectify it as the heater will need a good continuous supply of water if it is to function properly. If it is an instantaneous type heater check with the instruction manual as that type of heater often need a high pressure supply.

Aug 04, 2016 | Water Water Heaters

1 Answer

I went to take a shower this morning and the water was ice cold. For more than twenty minutes the water ran and never warmed up. Are there common things to check my hot water heater for in this situ


There is an adjustment knob to control how hot the water can become. There might be a problem at the tap (however, if this is the case, you would still get hot water everywhere in the house). If the entire house isn't getting hot water, and the knob is set at the hottest water, you probably need to get the hot water tank replaced.

Feb 04, 2015 | Rheem Tankless Hot Water Heater...

1 Answer

Premier Plus Model#MHE62-30H-045DV Ser#45T421608 I just purchased this hot water heater.I had it professionally installed by a plumber.We had hot water before I went to bed but when I woke in the morning...


sounds like you have a power problem. or worst than that a leak . So lets look at the leak first. Turn off the water supply at the water heater on top. This valve should be on the cold side of the heater on top.

Turn it off, check and see if you have pressure in the house by turning on a faucet. It should run for a second then stop. That is good if it does. Leave the valve off on the heater and check that your breaker is on. Reset the breaker by turning it on and off.

Wait about 2 hours turn the heater back on and check to see how hot the water is hot then you might have a leak in the building. If there is not or little hot water. Check the wires where it connects to the water heater. You might only have one wire that is connected right.

The best thing to do is to get a amo meter and check to see if you have 220 if you dont have 220 you will not warm up the water the way it should.

Thanks Richard

Sep 07, 2011 | Premier Water Heaters

1 Answer

Cant get hot water pressur


If you have galvanized pipes I'd say it's probably time to replace them. Another problem may be the main valve over the water heater is failing or partially closed. Check supply's over heater for kinks. These are solutions to not having hot water pressure anywhere in the house. If it's a local problem, just the shower or sink, then you have to check hot water valves and supply's at these points.

Apr 23, 2011 | Water Heaters

1 Answer

I am losing water pressure, but only on the hot side. Cold pressure is fine, as you add hot the pressure fades, the hotter the less pressure. This is at all points in the house. The water heater was...


You have a clog in the hot water line.
If problem is at one faucet, then remove aerator and clean, then disassemble lines underneath sink.

If problem is at every faucet, then that moves search close to water heater.
Look at hot water line that exits water heater and trace that line to first Tee.
Look at cold water line that enters water heater and trace that line to Tee.
Clog is located between those 2 Tees.

Buy pressure tester that connects to hose thread.
geno_3245_251.jpg
Connect pressure gauge to hot water heater drain valve.
Then conduct same test you did at faucet.
See if pressure drops at tank.

If pressure drops, then clog is on cold side of tank, and probably hot side too.
If pressure does not drop, then clog is on hot side of tank.

Suspect 1 is any place two different metals join. For example galvanized pipe and copper.
Suspect 2 is supply pipes that exit top of tank. Take apart and look inside pipes for corrosion and sediment lining pipe walls.
Suspect 3 is elbow. Disassemble pipes and look for sediment and flakes of rust.
Suspect 4 is all suspects above, each having sediment and corrosion.

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Jan 19, 2011 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

Turned off the hot water to fix a leaking tap. now the tap has no hot or cold water and the hot water tank valve is leaking?


It sounds like two problems.
Problem 1) Clog inside faucet or clog inside pipes at faucet
Remove supply tubes leading to faucet and see if problem is inside pipes or inside faucet.
My bet is clog inside faucet.

If you have galvanized pipe that meets copper pipe, this can be trouble spot.
Article on clogged water pipes at Inspectapedia:
http://www.inspectapedia.com/water/Water_Pipe_Clog_Repair_Guide.htm

Article on clogged pipes:
http://www.waterheaterrescue.com/pages/WHRpages/English/Troubleshooting/Tanklets/backflushing.html

Problem 2) Water heater leak ... you say tank valve is leaking? Is that cold-water shut-off valve? Or tank drain valve? Or TP valve?

If cold water shut-off is leaking, then replace shut off.

If tank drain valve is leaking, then check if plastic valve is cracked. If drain valve is cracked, then replace with a brass valve from Home Depot. If plastic valve breaks off, then use hammer and screwdriver to gently chip out the broken plastic valve. New valve threads need teflon tape to seal pipe. If valve is just dripping, then put garden-hose cap over end of valve and screw down tight.

If TP valve is leaking, then replace with same temperature and pressure rating.
New TP valve threads need teflon tape to seal pipe.

Problem 3) If pressure is low all over house:
Buy pressure gauge at hardware store that screws onto hose connection.

Test pressure on outdoor spigot.
Open faucet and check if pressure drops. This says if problem is inside pipes that enter house.

Test pressure on water heater drain valve.
This says if pressure problem is before -or- after water heater.

If problem is before the water heater, then shut-off valve located on cold water line is suspect.
If problem is after water heater, it could be in hot water outflow pipe on top of water heater, or a nearby elbow.

Remove hot water line leading from water heater and check pressure. This says if problem is where hot water leaves tank.
Read articles above about clogs inside water lines.


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Want to change water faucets


Centre tap of the rinnai will turn off hot water supply only.
Easiest way is to turn off your mains water supply. This will isolate both hot and cold, no need to turn off anything else

Jul 11, 2010 | Rinnai Digital Remote Water Heater Control...

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If main water supply line is shut off and thermostat is turned up on my gas water heater could relief valve open ?my girlfriend was taking a bath and told me the water pressure was weakening and water...


pressure would go down any time the water is cut off. Temp went down no make up water relief went off cause you turned it up. put it back and put the main back on.

May 09, 2010 | Water Heaters

1 Answer

Plumbing connections


Water source. City...New line..."T" the line so cold water services the house and the other line runs direct to the inlet side of the heater. Make sure you are connecting to the line after it passes through a pressure regulator. If you have a pump and water tank...."T" the line after the tank so cold water services the house and run a line directly to the inlet side of the heater. The outlet side gets connected to the main feed for hot water to the house. These do not require a storage tank. It does take a short period of time to heat the water, but once they get to temp they have an endless supply. Make sure you vent the heater if gas. After you get hot water, you can adjust the temp to the required temp according to the code in your area.

Apr 24, 2009 | Water Heaters

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