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Old 01-31-2015, 11:28 PM   #1
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On demand water heater

We have just gone full time in our 5er and we are contemplating replacing our water heater with an Atwood on demand water heater any one done this or heard any negative outcomes from doing this. In our home we had an on demand system and loved the endless supply of hot water were looking forward to the same luxury in the 5er
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Old 02-01-2015, 12:00 AM   #2
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My parents had one in their '57 Kencraft TT. It was a special order unit and the WH was a European one. Worked fine for just the small usage there.
Others have said even the new ones don't really provide enough flow for a good, hot shower.
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Old 02-01-2015, 09:54 PM   #3
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davnan

Thank you
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Old 02-02-2015, 04:29 PM   #4
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If this is the Atwood tankless water heater, some folks just cannot get them to work right.
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Old 02-02-2015, 04:38 PM   #5
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Truma has new AquaGo unit just out. Look it up!
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Old 02-02-2015, 04:46 PM   #6
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FWIW Check the specifications to make sure it will handle the water temperature rise you expect at the flow rate you expect to run.

The two problems mentioned the most come down to the burner will not come on unless there is more than a minimum flow so if you try to run just a little water they do not come on. The other problem is not sufficient burner capacity to take the flow you expect up to the temperature you want when showering. For instance a 50 deg rise at 1.8 GPM will give you a cold shower in much of the country this time of the year because you will be taking a shower at around 90 deg.
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Old 03-12-2015, 01:09 PM   #7
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I have the new Atwood on demand heater in my Newmar. It is a little erratic and sometimes not lighting at all. The air flow pressure switch sticks, stopping the burner for lighting. I understand there is an upgrade to this. I am taking rig back to dealer for other issues and need to check on that. It takes a little to get the temperature to stabilize as well. I never had problems with the 10 gallon heaters running out of water but tankless is the future so the technology will take a little while to mature. Residential phaseout of tank style heaters is scheduled to begin this spring.
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Old 03-13-2015, 06:32 AM   #8
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Tankless has been trying to mature for over 50 years. It it as mature as it gets.

FWIW tank heaters are not being phased out. The better description would be better insulated tank heaters are being phased in. 30 years overdue IMHO.
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Old 03-13-2015, 07:37 AM   #9
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While Sticks and Bricks tankless water heaters have been around for years and have proven designs, it appears that redesigned RV models still have some unique RV problems to overcome.
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Old 03-13-2015, 08:06 AM   #10
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We swapped our six gallon propane water heater to the Atwood On-Demand water heater. At the time, there were two models and we went with the 50,000 BTU model because when we are at our property we are using well water, which it pretty cold during winter months. It worked fairly well, could be erratic sometimes. I liked it better than the six gallon propane that we had. We are in a different RV now, that came with a ten gallon electric/gas water heater. No way would I take this one out and swap it for an on-demand. This ten gallon meets our needs just fine and is not nearly as finicky as the on-demand. If this one goes out, I'd swap it with the same exact ten gallon model.
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Old 03-13-2015, 08:54 AM   #11
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Quote:
Originally Posted by nothermark View Post
Tankless has been trying to mature for over 50 years. It it as mature as it gets.

FWIW tank heaters are not being phased out. The better description would be better insulated tank heaters are being phased in. 30 years overdue IMHO.

I've been in the HVAC and R&D world too long to ever believe a manmade system is as mature as it can get. I think you'll find the industry is moving to heat pump and/or tankless heaters as the future of energy efficient HW heaters. I'm an old guy so I don't necessarily agree with this move and don't get me started on the whole refrigerant phaseout thing. Another example of big business driving legislation.
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Old 03-13-2015, 09:17 AM   #12
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"In our home we had an on demand system and loved the endless supply of hot water were looking forward to the same luxury in the 5er."

I'm waiting for a great answer as that is at the top of my list for boondocking. I would totally abandon a class A for that luxury.
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Old 03-14-2015, 08:57 AM   #13
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Considering that when you are boondocking you do not have an endless supply of *water* why worry about it being hot?
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Old 07-15-2015, 06:38 AM   #14
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On the '98 Flair I just bought, someone cut the wires on the AC making this a 6 gallon LP water heater. I am half into replacing it with an On-Demand from Atwood, but the wiring has me stumped. I may end up with an extra receptacle in the kitchen (the 120 VAC not needed by the water heater). The On-Demand only needs 12 VDC to start the LP. I just wish the wire colors were consistent from model to model. I'll figure this out!
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