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6 posts

Wannabe Geek

# 258556 9-Oct-2019 16:19
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Hi All,


I am in need to of some help with regards to identifying what is causing water dripping (not the little water in the pic) from the water heater external drain pipe (which has caused high water bills in the past few months)


I have attached a pic, with some additional pics for different angles to show you my water heater setup


Based on the numbers marked in the image, I have noted below the respective valves and pipes to the best of my knowledge but I am new to this, so please do correct me if I am wrong:


1. Cold Water Inlet (rising from below the floor)


2. Power Supply


3. Filter/Non-Return Valve


4. Limiting Stop Valve


5. Cold Water Expansion Valve EVT


6. Is this blue tap a gate valve?


7. What is the purpose of this pipe (its cold)


8. Cold Pipe, coming out of the top of the cylinder and draining down to outside


9. Hot pipe, coming out of the top of the cylinder and supplying hot water to the house.




So the when the mains are open at the water meter, the meter is ticking slowly but continuously. I noticed that the near the waste water outlet (outside the house) there is a small pipe dripping water continuously.


I narrowed it down to the water heater area and this external drain pipe connects to the pipe 8. (in the pic) and the EVT (5.)


When I close the filter (3.) then the supply to the water heater stops, i.e. the hot water in the taps also stop and the dripping out of the drain pipe stops too.




Is it the cold water expansion valve (5.) which is faulty or is the heater overfilling internally to cause it to drain excess cold water?




NOTE: There is no visible leakage anywhere around or above or below the water heater.


Any help would be super great as I would like to DIY this if its possibly a minor issue.


















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3085 posts

Uber Geek

  # 2333456 9-Oct-2019 17:16
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Regardless of brand the trouble shooting should be similar.

5656 posts

Uber Geek

  # 2333459 9-Oct-2019 17:20
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No pics, but the most common reasons would be a leaking expansion/pressure release valve causing water to keep slowly leaking, or a failed thermostat causing it to overheat and release pressure through the expansion valve.


If it stops leaking after a while if you turn off the power, it's probably the thermostat causing it to over heat. If it keeps leaking when powered off, then a leaky valve.


@aredwood knows a thing or 2 about these.


6 posts

Wannabe Geek

  # 2333511 9-Oct-2019 18:07
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Wannabe Geek

  # 2333512 9-Oct-2019 18:09
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thank you for you quick responses. I will test and proceed accordingly

6 posts

Wannabe Geek

  # 2333521 9-Oct-2019 18:28
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Tested and even when (2.) power is switched off, as soon as the Filter Stop (3.) is opened, the water is dripping at the outside drain exit.





68 posts

Master Geek

  # 2333646 10-Oct-2019 08:23
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If it is your thermal relief valve (TRV) passing then the pipe from it to the drain will feel warm

6 posts

Wannabe Geek

  # 2333845 10-Oct-2019 10:48
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Pipe (8.) from top of cylinder, connected to the TRV, is room temperature. Water at the drain outside is cool, not cold though.


So does that narrow down to the cold water expansion valve, being the possible fault, causing the cool water to drip continuously through the drain pipe outside?


68 posts

Master Geek

  # 2334903 10-Oct-2019 11:58
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Yes that points to either your CWE valve or manual drain valve passing.


You could temporarily remove the drain piping (7) to see which is passing.


Have you lifted the lever on the CWE valve to flush it?



6 posts

Wannabe Geek

  # 2335179 10-Oct-2019 18:30
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I have lifted the lever on the CWE, and water does gush out of the same outlet outside, and then reduces to dripping once I release the lever.


I cant remove pipe 7., welded on one side and I am afraid I might break it.


What is the purposed of the blue tap (6.)? is that a gate valve? and does it have to be completely clockwise or anti-clockwise or in between? Tried all combinations with this one and the dripping doesnt seem to stop



3085 posts

Uber Geek

  # 2335212 10-Oct-2019 19:48
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Opening the blue tap with the cylinder stop valve closed would drain the tank. If you didn't notice any change at the drain outlet maybe the gate valve is stuck shut. The valve wheel should turn quite a few turns winding up and down.

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