Fresh water tank - Page 2 - Fiberglass RV


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Old 09-08-2015, 10:58 PM   #15
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Name: Linda
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Thanks, Glenn and Carol, for your replies! I'm quite sure we don't have a bypass system so once we turn on the water pump the hot water tank will fill. So, now my next question is... as we use hot water is it replaced so that 6 gallons stays in the water heater all of the time or does it only fill when it approaches empty? Does unused hot water from one trip remain in the tank and, upon filling the fresh water tank and turning on the pump, only whatever amount of water is needed to fill the 6 gallon hot water tank will move from the fresh water tank?
Do my questions make any sense?! Thanks.
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Old 09-09-2015, 01:02 AM   #16
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Originally Posted by ljswanson53 View Post
Thanks, Glenn and Carol, for your replies! I'm quite sure we don't have a bypass system so once we turn on the water pump the hot water tank will fill. So, now my next question is... as we use hot water is it replaced so that 6 gallons stays in the water heater all of the time or does it only fill when it approaches empty? Does unused hot water from one trip remain in the tank and, upon filling the fresh water tank and turning on the pump, only whatever amount of water is needed to fill the 6 gallon hot water tank will move from the fresh water tank?
Do my questions make any sense?! Thanks.
The hot water will continue to pull water from the fresh water tank as you use the water in the hot water tank in order to keep the hot water tank full. Once the fresh water tank is empty the sad news is you will not be able to get much if any of the hot water out of the hot water tank as there needs to be water in the fresh water tank to create the pump pressure .. easy fix, just use a portable container to refill the the fresh tank.

Yes the water in the hot water tank remains in it - unless you drain it from the outside. I use my trailer frequently so I do not normally dump out the hot water tank every trip but do drain it out at few times a camping season as I have found water from questionable sources (often private well water) can get smelly in the hot water tank if left sitting in real warm weather. Also make sure you drain the hot water tank before the winter cold weather sets in.
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Old 09-09-2015, 01:14 AM   #17
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Originally Posted by ljswanson53 View Post
Thanks, Glenn and Carol, for your replies! I'm quite sure we don't have a bypass system so once we turn on the water pump the hot water tank will fill. So, now my next question is... as we use hot water is it replaced so that 6 gallons stays in the water heater all of the time or does it only fill when it approaches empty? Does unused hot water from one trip remain in the tank and, upon filling the fresh water tank and turning on the pump, only whatever amount of water is needed to fill the 6 gallon hot water tank will move from the fresh water tank?
Do my questions make any sense?! Thanks.

Yes, the water is replaced from the fresh tank as you use any hot water from it and it does stay full, just like it works in your home water heater. The water will always stay in the tank, one trip to the next, unless you drain it. If your heater tank is full, try filling the fresh tank and see if it disappears to eliminate the possibility of your water going from the fresh to the heater. I've never heard of this happening before without finding a big wet spot from a leak. In over 30 years I've never drained any of my water heaters and never had a problem but I don't have to winterize either. Not a bad idea though.
BTW, your questions are exactly why we are here.
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Old 09-09-2015, 01:18 AM   #18
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Thanks Carol, I forgot to mention the pressure needed for the water heater to work .
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Old 09-09-2015, 01:23 AM   #19
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Originally Posted by Byron Kinnaman View Post
With my fresh water tank full to overflow, when I get to where I'm going to camp less than a gallon has left.
Strange I have filled my tank and not lost much if any water when traveling Funny part is I more often than not fill the tank just before heading down a rough roads as well.
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Old 09-09-2015, 01:44 AM   #20
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Originally Posted by Glenn Baglo View Post
What is the point of filling it then? What's the point of having a tank?
When I get to the campsite I'm headed for, my fresh water tank will be full ( over back roads ) and I'll have another 5 gallon container. Because, there are no taps, no pumps, no hookups. Just a lake.
"Less than a gallon has left" Translation -- Less than one gallon got away. Translation #2 All is still there except for about 1/2 gallon.
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Old 09-09-2015, 01:44 AM   #21
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One more thing I can usually make that 10 gallons last for at least 2 weeks.
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Old 09-09-2015, 05:19 AM   #22
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okay, since we're on this subject, I have a question that's been driving me bananas. Before I started my trip, I filled my tank half way with water, about 12.5 gallons. On the first night I turned on the water pump and primed all the lines. The next day I checked my tank and had "lost" half of my water. After fretting quite a bit about maybe having a leak in my new Casita, someone at a park in Yellowstone told me about filling up the hot water heater. Aha, mystery solved, nerves calmed. Here's my question... when I got home, I purged all the lines and emptied the tank, not necessarily in that order, but does the hot water tank stay full after the initial fill-up or does it empty with purging the lines. What I read and what I'm told by friends is often vague and confusing.
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Old 09-09-2015, 05:25 AM   #23
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my bad. I guess you answered my question on page two. Didn't see a page two until I posted my question. So am I right that the hot water tank always stays full unless drained from outside? Even if I empty the fresh water tank and purge all the fawcetts? (How do you spell fawcetts?)
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Old 09-09-2015, 06:22 AM   #24
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The Casita's overflow/vent pipe is at the rearmost top of the tank and runs nearly horizontally to the vent into the fill door. Although some Scamps and earlier Casitas have a cup-like fill. At any rate I lose a gallon or two from the fill station to the camp site from water sloshing in the tank and out the overfill. One project (far down the list) is to lengthen the hose and move the tank connection to the forward part of the tank to eliminate the "slosh-loss". Sloshing forward would lessen the amount of water pushed "backwards" and also lost from any time there is a slight tilt backwards.

If the vent outlet was higher than the tank connection I'd lose less but it would be a higher lift for when refilling with a water jug.
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Old 09-09-2015, 07:55 AM   #25
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Originally Posted by John Linck View Post
I too found my tank with less water than when I started out. I found no leak, but surmised that the water rushes forward during braking and the resulting pressure sends water out the vent hose which is located on the front of the tank. So I installed a valve on the hose and it no longer happens, at least when I remember to close the valve. That said, I only lost about 3-5 gallons. I don't see how the whole tank could empty.

Cheers, john
I'm looking into installing a valve on the overflow as well. Plus when I'm filling up the fresh water tank, I will run pump to fill hot water tank to see if that will help.


Thanks for everyone's input.
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Old 09-09-2015, 08:45 AM   #26
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I too found my tank with less water than when I started out. I found no leak, but surmised that the water rushes forward during braking and the resulting pressure sends water out the vent hose which is located on the front of the tank. So I installed a valve on the hose and it no longer happens, at least when I remember to close the valve. That said, I only lost about 3-5 gallons. I don't see how the whole tank could empty.

Cheers, john
I am not sure a water tank vent is even necessary. Seems the lid on the gravity water fill is not airtight. Any makeup air needed during pumping could come in around the leaky seal. (On the other hand the pump is strong enough to collapse the tank if no make up air allowed to enter.) I've noticed the rate of fill / burping seems the same whether the vent valve is open or closed. But my vent line remains and the valve keeps my tank full. BTW. The vent line seems to snake around above the tank in what seems an attempt by Scamp to prevent the automatic dumping of water while in motion. Perhaps the variety of experience may result from various tube routing. Who knows?

Many folks like to tow with the fresh water tank empty. I like to use my high quality home water as long as possible and the extra weight in the rear of the Scamp lessens my tongue weight. My Subaru tow vehicle wants the tongue to weigh less than 200 pounds. The 90 pounds of water seems to drop the tongue weight about 15 pounds. With a few additional mods and hocus pocus I achieve the 200 pounds.

John
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Old 09-09-2015, 09:21 AM   #27
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Oh, thank you, thank you, thank you! You have taken me from "No clue" to an appreciable understanding of how the water system works in my Scamp. I think I get it now! You guys are so smart - not to mention invaluable!
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Old 09-09-2015, 10:38 AM   #28
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Originally Posted by wellduh326 View Post
So am I right that the hot water tank always stays full unless drained from outside?
Yes
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