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Old 05-22-2018, 10:58 AM   #1
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fresh water heater

I just purchased my 2016 Rock Wood Roo 21ssl and I don't see in the owners manual how to use the water heater using city water hook up. Can you give me an idea how this works..

I think it is this...

- Connect hose from city water hook up to trailer
- Turn on all water inside trailer to get rid off air
- Go to the water heater cabinet out side of trailer and turn heater to "ON"
- Return to inside of the trailer and turn water heater on

Is this correct. I am going camping in a few weeks and want to make sure this all works before I go. Thanks in advance
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Old 05-22-2018, 11:01 AM   #2
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The outside switch is for the electric element in the water heater. The inside switch is for gas. You can run on both if you so chose. Definitely make sure the water heater is full before you turn on the electric element. Also a good idea to bleed off the air at the water heater, as this will remove more air than just running water through a faucet.
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Old 05-22-2018, 11:05 AM   #3
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Quote:
Originally Posted by calimarine0861 View Post
I just purchased my 2016 Rock Wood Roo 21ssl and I don't see in the owners manual how to use the water heater using city water hook up. Can you give me an idea how this works..

I think it is this...

- Connect hose from city water hook up to trailer
- Turn on all water inside trailer to get rid off air
- Go to the water heater cabinet out side of trailer and turn heater to "ON"
- Return to inside of the trailer and turn water heater on

Is this correct. I am going camping in a few weeks and want to make sure this all works before I go. Thanks in advance
Maybe this link will help you out, as it has lot's of useful information for RV'ers, including on how to operate a Suburban water heater (if applicable)

New to RV's helpful hints
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Old 05-22-2018, 11:08 AM   #4
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fresh water heater

Let me get this straight.... please be patient..

If I have a hose hooked up to my trailer, I can use the outside switch for the electric element for the water heater and / or the gas for it? correct?
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Old 05-22-2018, 11:24 AM   #5
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Before you do anything, after you hook up the water hose and turn on the water supply, turn on the hot water faucet inside the trailer to put water into the hot water tank(heater).

You probably need to be hooked up to an electric hookup to get the hot water tank to run on electricity.

Make certain that your propane tanks are ON and you've bled out the lines. (Bleed out the lines by lighting a stove burner til the flame runs true.) Then you turn on the propane tank to the heater with a switch inside the unit.

You should be able to run it on propane and electric at the same time assuming that you've got the electric hooked up and the propane on.
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Old 05-22-2018, 11:38 AM   #6
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Run it on gas until you're sure it's full. Then run on electric. It doesn't use that much gas.

Here's a generic plumbing diagram. Covers most RV's. Note page 2 shows a number of ways that the manufacturers have come up with to bypass the water heater for winterization. You will want to make sure that the valves have been turned back to normal, or you won't fill the water heater or be able to use it. Also make sure the faucets for your outside shower, if you have one, are closed, otherwise it creates a path for cold water to mix with the hot.
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File Type: pdf RV Plumbing pic.pdf (125.9 KB, 5 views)
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Old 05-22-2018, 11:54 AM   #7
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Here is a very basic RV plumbing diagram. Click image for larger version

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Old 05-22-2018, 11:59 AM   #8
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Originally Posted by calimarine0861 View Post
Let me get this straight.... please be patient..

If I have a hose hooked up to my trailer, I can use the outside switch for the electric element for the water heater and / or the gas for it? correct?
Close but not quite. The outside switch on the water heater is ONLY for turning the electric element on and off. It is 100% independent of the inside switch that enables the gas burner for the water heater.

- You can use the inside switch by itself with the outside switch off and it will only heat with propane.
- You can use the outside switch by itself with the inside switch off and it will only heat with the electric element
- You can turn both on and heat with both gas and electric, this is what I do when people will be showering as you will have 2 heat sources to help with recovery. Once showers are done then I'll turn off the gas switch and use electricity to maintain the hot water.

Also, if you do not have shore power (120v plug-in) to the trailer then the 120v electric element won't work, in which case you will have to use propane to heat the water.
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Old 05-22-2018, 12:01 PM   #9
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DO NOT turn on the water heater empty. Make sure it's full of water first or you will burn out the heating element.
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