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Old 11-30-2015, 10:34 AM   #15
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Did you have a place do that work? If so I want to get their information. That's well outside of my DIY scope but it looks fantastic. Nice work!
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Old 11-30-2015, 10:44 AM   #16
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I have a tankless heater at home, and it works well there - you can run your shower continuously. However I would not buy one for my trailer as we often camp where there is no sewer hookup. When you take "navy" showers, every time you turn off the water, the water heater turns off. These systems do not work as well when you turn them on and off.

If you always have a sewer hookup, you can just leave the water running and you will not have an issue. For those who like to dry camp, you should consider carefully.
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Old 11-30-2015, 03:37 PM   #17
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For what its worth, I dont know that mine would be an issue for navy shower. Granted, thats not what I bought it for, but the bench testing was quite impressive. It fired up instantly, and I saw no more than a "slight" fluctuation in temp when cycling on/off. I guess because the lines still have hot water in them, and the water in the heat exchanger was still hot, so not really sure why there would be an issue.

I too, read some comments discussing this prior to my purchase, but I can confirm no issue with the Atwood OD50 here. Perhaps maybe with the Girard, which doesnt have many good reviews?
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Old 11-30-2015, 08:36 PM   #18
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Both of the Truma 'AquaGo custom' units were installed by A&P Vintage Trailer Works in Paradise, TX as part of a long list of modifications. The Classic's unit was Paul's first install of the Truma product and the 23D was about his fourth. He is very pleased that the size is much smaller than the Atwood tank heaters for restoration work on the vintage trailers where space is at a premium.

This installation off loaded about 84 pounds of weight consisting of the 6 gallons of water and the net weight difference between the Atwood and the Truma.

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Old 11-30-2015, 09:19 PM   #19
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In really cold weather, with our rear wet bath, and the water heater in the bottom of the wardrobe forward there is a noticeable delay of 1-2 seconds before you get hot water at the shower. I have more of an issue adjusting the temp in the shower because of the long shower hose. Takes a bit of patience. Once the temp is dialed in, it's flat out stable. Besides, if wife is happy, everyone's happy.


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Old 12-01-2015, 09:04 AM   #20
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Unless the water heater is just below the faucet and regardless of the hot water generator, the volume of water in the hot water line from the heater location to the faucet has to be purged before one feels any warmth.

The Quick shower on/off technique has the same water cooling between squirts regardless of the source.
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Old 12-01-2015, 10:13 AM   #21
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I've really wondered about these for boon docking. I like the weight savings. Seems more efficient to heat only what I need. But have wondered if the pump would be enough pressure for this unit or if it's best suited for those on a city hookup.
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Old 12-01-2015, 10:20 AM   #22
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Tankless Water Heater

I use a residential tankless, the pump flow is more than sufficient, but there is a second and a half delay from valve on to the start of heating, and then I have to wait for my 1/2 pex lines to fill with water before the shower heats, a few seconds even though the run could not be any shorter from the heater to the shower valve as my heater is literally hanging on the shower enclosure wall.

If I had it to do over again I would consider running 3/8" pex for the hot water.


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Old 12-01-2015, 10:46 AM   #23
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We have considered these as well, but see no advantage over our tank style heater.

We have never run out of shower hot water, probably 1400 nights in the Airstreams, it operates on electric, propane, or both. It adds 6 gallons to our Airstream on board water supply, no issues with Navy showers or issues with wife (we're both Navy retired), we turn it on only as needed. If we are short on electric when boon docking we use propane, if short on propane with hookups we use electric, very versatile. The cost of keeping what we have is zero.
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Old 12-01-2015, 12:32 PM   #24
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Tankless Water Heater

One advantage is that a 30 pound propane tank will last for months in the summer time while I never have to wait for the water to heat.

Another is my wife can take a super long shower, and I still have hot water for my own shower..... Even a really long one.

I don't really boondock though, no more than a couple a few nights at a time while "in transit".


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Old 12-01-2015, 01:25 PM   #25
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Yup. Wife loves ours. That justifies the cost. The 'extra' 6 gallons is inaccessible unless you pull the drain plug. I needed to reduce weight forward if the axles so this is a win as well. If I could reach the hot water lines easily, I would insulate them to reduce heat loss. It would de a major pain on our AS but if I ever need to dig into the plumbing I would do it just for drill.


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Old 12-01-2015, 01:35 PM   #26
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So if you use one of these systems does the hot water switch in the bathroom become an on/off switch? Do you just leave the existing switches plate in the wall, disconnect one of the switches and leave the other connected to the tankless heater?

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Old 12-01-2015, 01:38 PM   #27
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My unit is very, very, energy efficient, and my up front cost for my unit was less than $500.

Insulating the hot water pipes would have been a good idea, I could still get enough access to do this with most of my tubing.

Who knows? I might this winter.


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Old 12-01-2015, 02:03 PM   #28
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The power and indicator light for the tankless I installed was the same connections. Switch 'arms' the system, light indicates start and/or trouble just like the old one. Seamless install IMHO.


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