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Old 10-03-2014, 11:16 AM   #11
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Yes ....using compressed air will force water out of the tank but that is not what was stated. The op didn't say he used any air. It will not drain IMO
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Old 10-03-2014, 11:45 AM   #12
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Originally Posted by tjpolsin View Post
Your low point drains should drain nearly all of the water out of your system - including the hot water tank.
- shut your water heater bypass valve
- open your water heater inlet and outlet valves.
- open both hot and cold low point drain valves.
- open all faucet valves, including outside shower (I remove the hose on mine)
- cycle the toliet valve to drain that line.

go inside and enjoy a cup of coffee while gravity does the work.
Agreed. My hot water tank drains as well when opening both low point drains.
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Old 10-03-2014, 11:48 AM   #13
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Yes, I believe the LP drains will drain your water heater. nbhybrid may be correct in that the outbound side of the WH (for hot water) is at the top, but the inbound side is at the bottom (to fill the tank). If you pull your low points (I have 2, one for hot water, one for cold) all the water will drain from your system, including from the water heater, through the fill side if nothing else.

I can tell you for a fact, and from experience that when I'm draining my system, I will go and pull the LP drains, a bunch of water comes out and then stops. Then I'll go and take out the drain plug in my water heater, and flip the pressure relief valve, and the water heater drains, and at the same time, more water comes from the LP drains. It continues this way for about 5 minutes before it stops.
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Old 10-03-2014, 12:04 PM   #14
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except my understanding of the system is that there is a check valve on the inlet to prevent the hot water in the tank from draining back into the cold water line. maybe I am wrong on this.

With no check valve what would stop you from heating up the cold water intake and if there is a valve the water shouldn't drain out.
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Old 10-03-2014, 12:08 PM   #15
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Originally Posted by Camper_bob View Post
I can tell you for a fact, and from experience that when I'm draining my system, I will go and pull the LP drains, a bunch of water comes out and then stops. Then I'll go and take out the drain plug in my water heater, and flip the pressure relief valve, and the water heater drains, and at the same time, more water comes from the LP drains. It continues this way for about 5 minutes before it stops.
so it isn't draining your hot water heater from your above post. more water comes out of your drains because the water from the hot side has air behind it now that you opened the HW heater
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Old 10-03-2014, 12:35 PM   #16
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When I started to drain the LP lines, I put a 5 gallon bucket under them because I didn't want water to drain all over my RV covered area. About 5 gallons came out. Right after I closed the LP valves, that is when I unscrewed the plug int he hot water heater and just got a couple of drops that came out enough to wet my finger. I went out this morning and checked everywhere and there is no water leaks under the TT.

So I'm thinking that one of the LP drains probably drains the hot water tank.
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Old 10-03-2014, 04:27 PM   #17
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so it isn't draining your hot water heater from your above post. more water comes out of your drains because the water from the hot side has air behind it now that you opened the HW heater

Good points, but that's A LOT of water in the lines. No, I truly believe that one way or another, the LP drains empty ALL the water including the water heater. I don't have access to my trailer, so I can't go look or test... But I will conduct some tests when I get my trailer back.
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Old 10-03-2014, 04:31 PM   #18
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I will test mine when I come back from camping next weekend but I can't see it.

Why would the winterizing process involve pulling the plug in the heater if the water is gone through another step?
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Old 10-03-2014, 05:11 PM   #19
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Why would the winterizing process involve pulling the plug in the heater if the water is gone through another step?
Good question and I agree, but have to agree with Camper Bob too - if I open all of my LP drains the water heater drains too. I've pulled the plug on the WH and verified that it's empty and I can also hear it filling when I recharge the system. Two of the three drains appear to come from the water heater, but one seems like it's a pressure relief or something along those lines as water only drains from one of them. When I open the first valve water just dribbles out, but as soon as the second is open I get a steady stream.

Probably unlikely, but is it possible that Jayco sets things up differently on different models?
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Old 10-03-2014, 08:09 PM   #20
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I open both low point drains then open the faucets to begin draining the lines and then proceed to open the pressure relief valve on the water heater. It should drain the water out of the heater. If you are not sure if it does for you then I suggest doing this while there is still hot/warm water in the heater and feel if the water draining from the low point drains is hot (Using caution to avoid injury, of course). It should take about 15-20 minutes (at least on my camper) to drain the entire system.
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