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Old 01-11-2016, 09:36 AM   #1
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Frozen hot water system

Help. My hot water system is frozen. Cold water works fine. I get no water out of any of my faucets. I have been blowing a hair dryer into the cavity where the water pipes run to no avail. Any tips or hints? Thanks in advance

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Old 01-11-2016, 11:07 AM   #2
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Don't have your unit so I can't help with the problem area but a word of Caution. It's important to physically see where the frozen section actually is because if it's at one of the plastic fittings it could crack it and you could have a silent leak after the water starts flowing again.
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Old 01-11-2016, 12:30 PM   #3
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The issue might not be the water heater it's self, might be the pipes leading to or from the heater.

You can check the flow to the water heater, by opening the pressure relief valve, just be prepared for hot spraying water.

Check where your pipes.run and open all the cabinets that have piping in, under, behind them
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Old 01-11-2016, 12:54 PM   #4
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Are you sure you don't have either the inlet valve or the outlet valve to / from the water heater closed?
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Old 01-11-2016, 01:22 PM   #5
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What is the ambient temperature?

Was the RV in storage or did it happen while parked and connected?

Good comments so far.

My 2 cents.

If frozen, it is likely pipes as has been mentioned. A hair dryer is not much heat. You may need to tent the open sides with cheap tarps and then use a 1500 Watt heater in the enclosed space. A Polonis cube heater or similar is 1500 watts.

I agree with the concern about leaks. After you get things going, you can do a static test to check for major leaks. Leaving everything connected, turn off the water supply. Leave all inside valves closed and undisturbed for a couple hours then try a sink faucet for pressure. If the pressure is good then you likely don't have a major leak.

Unfortunately the "static test" will not check for more minor leaks. To check for those you need a pressure gauge.

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Old 01-11-2016, 01:28 PM   #6
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Was the water heater bypassed to winterize? I remember the same issue once and guess who forgot to reopen valves, lots of cold and not a drop of warm.
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Old 01-11-2016, 05:38 PM   #7
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Quote:
Originally Posted by scotth220 View Post
Help. My hot water system is frozen. Cold water works fine. I get no water out of any of my faucets. I have been blowing a hair dryer into the cavity where the water pipes run to no avail. Any tips or hints? Thanks in advance

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Need a lot more details about when this occurred and what you were doing. Coming out of storage? After a cold day/nite while camping? After you refilled your fresh water or connected to city water? Etc. My guess if it was anything to do with first trip out after winterizing is that you didn't open all the valves in the bypass.

Resolved yet? Don't be shy, we all do crazy stuff.
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Old 01-11-2016, 06:43 PM   #8
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On our first sub-freezing night (~28deg or so) I got up to use the head in the small hours. No flush and I figured my lines were frozen.
Turns out the CG had shut their water off out of freeze fears.
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Old 01-11-2016, 09:48 PM   #9
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I wish you would of posted more information. What I find strange is the cold water is working fine but not the hot water, if using the city water connection or drawing from your fresh water tank, both hot and cold water use the same input. I do not think the blockage is in the hot water line simply because that water would be hot and why would that water line freeze with hot water and not the lines with cold water?
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Old 01-12-2016, 12:45 AM   #10
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You could try opening the pressure relief valve from the hot water tank. Be careful as it will be hot if turned on. If you have flow there then the problem will be from the tank to the taps. If no flow there then its the cold supply to the tank that you will need to check first. Doubtful the actual tank will be frozen if your cold is working elsewhere.
Like a previous message says too, be careful once thawed out as if there is a problem, thats when it will show up, so be ready to turn off the water.I would think its more likely to be in the underbelly than inside the unit if the cold is still running. Of course this is providing you have got the hot system turned on properly. Also if you have a heated underbelly you should have the heat running and hopefully get it warm under there.
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