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Old 09-01-2015, 08:53 AM   #41
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If You Want More Fresh Water

Turbs most of us have on demand WH so no tank. Not all but most.



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Old 09-01-2015, 09:31 AM   #42
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I wasn't going to look through 86 posts to see but was it mentioned that they include your wh tank as fw capacity?


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And what would you say the capacity of a Berkshire hot water tank is?
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Old 09-01-2015, 09:39 AM   #43
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And what would you say the capacity of a Berkshire hot water tank is?
Lol 42 gallons?

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Old 09-01-2015, 10:04 AM   #44
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Lol 42 gallons?

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Thanks, that's more than I thought it would be.
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Old 09-01-2015, 10:13 AM   #45
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Turbs - We are talking about the fresh water (not hot) capacity of a Berkshire which has a specification of 86 gallons capacity. But as I pointed out in post #39, one can end up with only 46 gallons useable
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Old 09-02-2015, 06:38 PM   #46
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I put a on-off valve on my vent line. I leave it open when filling and when it starts running out I turn off the water and close the valve. When I get where I'm going I open it and leave it open til I fill tank again. Works great for me and I usually come home with water left in stead of running out.
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Old 09-02-2015, 06:58 PM   #47
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I put a on-off valve on my vent line. I leave it open when filling and when it starts running out I turn off the water and close the valve. When I get where I'm going I open it and leave it open til I fill tank again. Works great for me and I usually come home with water left in stead of running out.
Motodad - You are in the very few category that seem to recognize the siphoning. As you probably know the vent is used for overflow and also to allow air in when you use the water.

As for your valve idea it is a way to stop siphoning, but if the valve is inside the water compartment with the yucky latches, that would be a pain. My pvc vent/ drain works good for me. Now we have two anti-siphoning methods. - Hank
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Old 09-02-2015, 07:20 PM   #48
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I put it on the outside. Where there is about 1/2 inch coming through the floor. Hangs down about 2". Really small valve. I never open the latches anymore. Works great for me.
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Old 09-03-2015, 07:16 AM   #49
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Motodad - If you get to where you are going with a full tank and if the overflow line is full of water right to your valve; won't it start siphoning when you open the valve? As I see it, it should keep siphoning until the water level gets below the overflow tube's attachment to the tank..
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Old 09-03-2015, 08:08 AM   #50
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Sometimes it does. I have a 4ft piece of hose that fits my on/off valve. I just stick it on and blow in it to stop the siphon. I know it's weird guys. But we were losing a lot of water. I now come home with water.
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Old 09-03-2015, 11:26 AM   #51
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Sometimes it does. I have a 4ft piece of hose that fits my on/off valve. I just stick it on and blow in it to stop the siphon. I know it's weird guys. But we were losing a lot of water. I now come home with water.
Motodad - You have a method that works for you, but still with lot of manual intervention, like having to connect a tube and blow. Give a try to my anti-siphoning; once done you do nothing. See post #1 and #39
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Old 09-03-2015, 11:31 AM   #52
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Will do. Thanks
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Old 09-03-2015, 11:51 AM   #53
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If your fresh water tank is connected like mine, the bottom 25 gallons cannot be used because the pump starts sucking air (see photos). This means we are carrying around 208 useless weight.

To get more water into the tank, you can fill it to the "F" light comes on, but this is only 83 gallons and with the bottom 25 gallons being useless, you have 58 gallons to use.

Next you can crawl down on the ground to take those blasted pins out of the latches to watch the tank fill. Now you have 75 useable gallons.

Rather then deal with those latches, I once just filled the tank until I saw water coming out of the overflow, beneath the RV. I shut the water off and was amazed that water kept coming out for several minutes. I quickly found out that the overflow siphoned the top 21 gallons out, leaving me with 79 gallons and 54 useable.

Well where is this going??? I cut 7 1/2 inches of the overflow tube off (from the floor up) that protrudes through the floor. Enlarged the hole (with rat tail file) for a 3/4" PVC pipe. stuck the cut overflow tube into it and hung it with a tie-wrap. Tried to use few tools.

Now the tank can blindly be filled until water comes out the tube. Then when the water is shut off, there will be no siphoning action. You will have 100 gallons with 75 useable.

I know that many do not want to carry 100 gallons, but for those that do, here is a filling method.

Guess until I get my coach and can crawl all over and under it to see what these beasts are made of I have a hard time to visualize some of these things. Why can't / don't the water outlet from the tank that feeds the coach come up from the bottom of the tank with maybe a small riser in the tank so that it won't let sediment in the line but yet let you use more of the dead 26 gallons in the tank ?
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Old 09-05-2015, 12:10 AM   #54
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Thats a good question, but I did this mod as well. Thanks I-RV! It took more time to get the tools out and back then it did to actually do it. That they didn't catch this is funny
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Old 11-11-2015, 01:27 PM   #55
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If You Want More Fresh Water

Has anybody ever measure there freshwater tank, mines only holds 75 gals. 66"x44"x6" ATTACH]94110[/ATTACH][ATTACH]94110[/ATTA
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Old 11-11-2015, 02:22 PM   #56
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Mine swells up at least 10 more gallons. Looks like it's about to pop. Lol. Then I shut the overflow valve off. After a half day of use I open the valve and no more siphone. Works great
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