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Old 02-09-2018, 10:35 AM   #1
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Tankless water heater

I have a 2018 which has a 'tankless' water heater. But when I brought it back to the dealer for first time winterization so I could learn how, the young acrobat twisted himself in through the back to 'drain' and 'bypass' the tankless' heater. But if it is tankless, why does it need to be drained and bypassed?

Richard
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Old 02-09-2018, 11:54 AM   #2
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Because you still have water in the lines... tankless does not mean waterless
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Old 02-09-2018, 12:05 PM   #3
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Because you still have water in the lines... tankless does not mean waterless
But why not just blow out the lines with an air compressor?

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Old 02-09-2018, 12:32 PM   #4
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But why not just blow out the lines with an air compressor?

Richard
To drain it, yes, air should work... that is how I was planning on draining it when the time came for me to do that.
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Old 02-09-2018, 12:45 PM   #5
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In additon to blowing out the lines....I suspect there is a small heat exchanger that needs to be blown out or drained as well
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Old 02-24-2021, 08:44 PM   #6
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Who makes the newer tankless water heaters for the Interstates?
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Old 02-24-2021, 09:11 PM   #7
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My 2018 had a Suburban, which is a piece of junk. I replaced it.
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Old 02-24-2021, 10:42 PM   #8
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How well do the tankless water heaters work while boondocking? I understand they require a lot instant power to be instant hot water.
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Old 02-24-2021, 11:01 PM   #9
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Originally Posted by NevadaGeo;
How well do the tankless water heaters work while boondocking? I understand they require a lot instant power to be instant hot water.


RV instant hot water heaters work using LP / Gas.... (not electricity)
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Old 02-25-2021, 10:07 AM   #10
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The tankless heater requires many seconds of high flow to even start heating water because of internal delays. Add a few seconds to get the elements up to temperature and a lot of water goes through before it really gets hot. That fills the gray tank very fast and is terrible for navy showers where you have to wait for hot water again to rinse off.

If you are boondocking, you had better figure a way to catch the excess water and put it back in the tank or you will run out of water fast.

That is why I ripped mine out and replaced it with an under-counter electric unit. We do not boondock, but I hated the tankless unit because of the delays.
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Old 02-25-2021, 10:19 AM   #11
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Tankless heaters can build up lots of scale on the heat exchanger and need periodic acid flushes. Winterizing is the perfect time to flush with vinegar.
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