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Old 07-18-2018, 12:39 PM   #1
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Replacement of Atwood Hot Water Heater on 2017 Isata 5 DS

Replacement of Atwood Hot Water Heater on 2017 Isata 5 DS


I have suffered with this water heater for 2 years and I would like to replace it with one that has a tank so that I take a shower without burning/freezing /burning/freezing…. About one time in ten I can adjust it for the incoming water temp and pressure so that we can take a comfortable shower. I recall that back in 16 when we bought ours there were some replaced but do not remember details. The other issue with it is you cannot do a “Navy” shower without doing the scalding/freezing routine. When we have no hookups would like to conserve water and a tank with constant temp water allows you to do that.



I would just get one and put it in but I need a new cover and I would like to match the coach. Will Dynamax do a replacement with matching cover?



How do people like the current hot water heaters?
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Old 07-18-2018, 02:39 PM   #2
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Most covers are not the same, so the only way to do a new cover painted is to have it here. Truma makes a replacement door that is larger (covers the old hole) and is painted black. I am not sure if any "tank" style versions have a door large enough or if they are painted anything other than white.
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Old 07-18-2018, 08:27 PM   #3
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Does the Truma that you are installing now maintain a constant temperature when you turn the tap on an off as a tank heater does? Can you mix hot and cold to get the temperature you want? It is almost impossible to get the Atwood to not cycle on and off if you are trying to mix hot and cold because of the flow switch.


I am not wedded to a tank heater. I just want to be able to take a shower with a constant reliable water temperature so that if I am trying to conserve water I can shut it on and off and not get scalding or cold water.
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Old 07-18-2018, 10:05 PM   #4
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Yes it does. We have a Truma in our 2017 Isata 3 and it performs every time.
Dynamax dropped Atwood due to all the issues and we waited for a unit that had the Truma unit installed. I think pretty much all the models below the DX3 now have the Truma as standard.

I think tankless is the way to go, just need a vendor that does it well.
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Old 07-19-2018, 01:20 AM   #5
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My Truma is amazing! Always consistent and hot water as long as you want.
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Old 07-19-2018, 08:36 AM   #6
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Truma technically is not tankless (called on-demand). There is a small mixing chamber, so the water is pre-mixed to remain at a constant 120 degrees at the outlet. Variations in pressure and water temp are adjusted there.

On the Atwood, water comes through a tube that is heated up as it goes through. Worked fine before...but if the water flow was set too low, it slowed too much in that tube and heated too high. In some cases I heard turning to steam. SO they recalled them and set the flor rate from about .5gpm to 1.5 gpm. So that the burner will shut off when it drops below 1.5 gpm, to prevent this over-heating. I think they over-corrected. I likely should have stayed in the 1gpm range
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Old 07-19-2018, 09:16 AM   #7
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Brian can I get factory service to replace the Atwood with the Truma and get a color matched cover?
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Old 07-19-2018, 09:21 AM   #8
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Depends on schedule...but if you reach our to your service writer, you can find out what our upcoming schedule looks like.
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Old 07-19-2018, 02:00 PM   #9
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Atwood hot water heater

Dynamax replaced ours at the frog rally last year with the truma as was still under warranty. Works great.
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Old 07-19-2018, 02:05 PM   #10
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Truma is the way to go. I checked the price to change out my Atwood and was quoted 1,400 by the Truma dealerr. Parts and labor including a new Truma controller. Just fyi.
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