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Old 03-10-2022, 11:06 PM   #1
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Brand: Thor Motor Coach
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THOR #25916
On Demand Hot Water System

How do u winterize a hot water tank that is a Hot Water On Demand unit?

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Old 03-11-2022, 12:46 AM   #2
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I am a little confused. On demand hot water systems almost by definition do not use a hot water tank. For example, the Girrard "on demand" and so called tankless water heater doesn't have a tank (well, duhh).

So winterize the hot water system just like the cold water system, assuming no tank.

Isn't it a bit late in the season to talk about winterization?

David
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Old 03-11-2022, 01:54 AM   #3
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Originally Posted by DavidEM View Post
I am a little confused. On demand hot water systems almost by definition do not use a hot water tank. For example, the Girrard "on demand" and so called tankless water heater doesn't have a tank (well, duhh).

So winterize the hot water system just like the cold water system, assuming no tank.

Isn't it a bit late in the season to talk about winterization?

David
You would've thought so but it's supposed to get down in the mid 20s here in north Florida Sunday AM. Luckily we're heading down to Largo for the weekend but now I've got to freeze-proof the garden before we leave tomorrow.
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Old 03-11-2022, 10:49 AM   #4
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Originally Posted by Nana View Post
How do u winterize a hot water tank that is a Hot Water On Demand unit?

You need to winterize the entire water system and not just the Girard Tankless Water Heater.

I typically hook up my compressor to then city water port and then open the hot and cold at each fixture one at a time to blow the water out of all the lines. That is usually good enough in a pinch.

Since I store my coach in PA while I am in FL 8 months out of the year, I will also pump RV antifreeze through the lines..... just to be safe.
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