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Old 05-27-2018, 05:00 PM   #1
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No hot water in 2400W rig

Hi - newby here. I have a 2400W MBS (class C). Last month I had my rig professionally de-winterized. Now I'm on my first trip...connected to full hookup site. Fresh water tank is full, but I don't have any hot water. I've been told the hot water tank doesn't need to be filled separately. Is there a valve that may have been missed during de-winterizing? Where is the tank (and valve) located? I've searched online but can't find any description of how to access the tank/valve, etc. Many thanks.
Rob
Canandaigua, NY
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Old 05-27-2018, 05:05 PM   #2
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Make sure the bypass on the hot water tank is closed. Make sure the outside shower/faucet are closed.

Ensure that drain and pressure relief valve are closed with no leaks.

Turn on electric pump and turn on faucet hot water only to fill hot water tank and expel all air out of the hot water heater tank.

Once hot water heater tank is full, turn it on either propane or electric for an hour and then check to ensure you have hot water.

Please consider doing all of your own maintenance such as winterization and dewinterization as it will save your money and allow you to trouble shoot stuff like this on your own. This forum is a great start to get to know your camper.

Good luck!
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Old 05-27-2018, 05:22 PM   #3
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Note that the manufacturers have developed a number of ways to bypass the water heater using 1, 2 or 3 valves that you must manipulate. See page 2 of the attached generic plumbing pic. Option #1 is most common.
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File Type: pdf RV Plumbing pic.pdf (125.9 KB, 16 views)
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Old 05-27-2018, 06:38 PM   #4
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when it was winterized the water heater was drained and bypassed. dewinterizing just flushes the antifreeze out of the plumbing lines. there is no reason for the person doing the dewinterizing to touch the water heater bypass valve(s). so you are most likely still bypassing the water heater and it does not have any water in it. if you tried to heat the water using the electric heater element without water in the tank you have probably now burnt out the electric heating element. it should still work on gas once you get water to it.
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Old 05-27-2018, 08:55 PM   #5
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thanks for replying...so, where do I find the bypass valve?
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Old 05-27-2018, 09:04 PM   #6
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Quote:
Originally Posted by hovey View Post
thanks for replying...so, where do I find the bypass valve?
It will be behind the water heater. You may have to remove a panel that could be screwed in, or lift a dinette bench; who knows. (Looking online, it appears to be under your stove.

If you have looked at the bypass options in the attachment I attached to Post #3, the more common 3 valve arrangement (Option #1), it will look like this:

Click image for larger version

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Option 2a looks like this:

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Option 3 looks like this:

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Option 4 looks like this (the fitting where it says "HOT" is a check valve):

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Old 05-28-2018, 01:15 PM   #7
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No hot water

Hello - thanks again for your help. Unless Iím missing something...the valves seem to be in the correct position (see attached photo). Where would I find the drain plug?
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Old 05-28-2018, 02:20 PM   #8
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Yes, your valves are in the correct position.

On Suburbans, the drain plug is actually the anode rod. It is the large "bolt" head in the pic below. You'll need a 1-1/16 inch socket to remove it.

Click image for larger version

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The anode is sacrificial, meaning it slowly is eaten away (instead of the hot water tank). Below is a pic of how it typically is eaten away, and when you might need to replace it. Note that there's a steel rod down the middle of it, so even if it looks like there's a lot on the end and not much near the threaded plug, it's still OK.

Click image for larger version

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2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
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Old 05-28-2018, 02:39 PM   #9
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EDIT: Nevermind, it's a shadow
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Old 05-28-2018, 02:42 PM   #10
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Quote:
Originally Posted by wmtire View Post
Yes, Cavie posted as I was looking at this. It seems the crossover line valve is open...which allows cold water over into the hot water line.


It's explained here:


NO (OR LUKEWARM) HOT WATER -Please read first


Make sure the crossover valve is fully closed (handle perpendicular with the line)
I deleted while you were typing. I can't be sure it is open. Very deceiving. Oh! hell, I stand by my first choice.
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