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Old 10-18-2011, 01:17 PM   #1
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Tankless water heater

Going to start getting cold here (Atlanta) and I'll need to winterize the coach before too long. I have a 2011 Phaeton with a tankless water heater. I looked through the manual but found nothing referring to this style heater in the winterization info. Are there any special steps one should take to properly winterize it or does just draining the water tanks take care of it? Thanks.
By the way my wife wanted this feature and I was a bit against it (I had heard there were problems with it) but I must fess up that I really like having that unlimited supply of hot water! (Oh, no, the wife is right again!)
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Old 10-19-2011, 10:52 AM   #2
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Look your tankless WH model up on-line. There should be manuals available for downloading.

I look into tankless models a while back. Seem to remember needing to make sure the water line in the WH is empty to winterize.
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Old 10-20-2011, 10:37 AM   #3
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Call Precession folks that made the unit. They are great.
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Old 10-20-2011, 11:16 AM   #4
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Certainly call the manufacturer and ask.

You only have 2 winterizing options, (well 3 if you drive it to Arizona or so). Pink it up and/or blow/drain it out.

The rule-of-thumb in deciding which is to ask yourself - can you get everything out if you blow/drain? That is, if you blow/drain will you clear all dips, turns, pumps, valves, etc. of pockets of water which could freeze and crack a line.

Given the tankless (and HydroHot and Oasis) units all use some form of a coil of water pipe to heat the water (tankless wraps the coil in heating elements hydronic units submerge the coil in a hot coolant bath) it can be difficult to blow/drain the water out of the coil. You might leave a pocket of water in one of the turns that is enough to freeze and crack the coil.

Hence, as a rule-of-thumb, if a coil of water pipe is involved your best bet is to pink it up. That way you can be sure of completely making any remaining water in the coil freeze proof.

Of course you can pink just the coil and blow/drain the rest.
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