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Old 09-30-2013, 05:36 PM   #1
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What good is the HW tank bypass valve on the Anderson docking station?

After repairing a major flood in the basement of our coach, I looked at the plumbing of the Anderson docking center. The hot water bypass valve, on the right, bypassed the fresh water around the hot water tank. This causes the hot water tank piping to remain isolated from the system when adding antifreeze. What good is this valve? Is it possible our coach is piped wrong?
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Old 09-30-2013, 05:46 PM   #2
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I will drain my system as good as I can first, including removing the anode rod and letting the HW tank drain. That will usually drain those lines. Not saying it will for your rig, since I have no clue how it's plumbed.
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Old 09-30-2013, 06:00 PM   #3
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How big is your heater 6-10 gallons?

At about 3 bucks a gallon do you really want to fill the tank?
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Old 09-30-2013, 06:08 PM   #4
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He's NOT filling his HW tank.

I drain my water heater and then blow the system out with air.
This removes the water from the bypass area.
Then I close the tank valves and open the bypass and pump the
system full of the pink stuff.

Works for me.
YMMV
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Old 09-30-2013, 06:10 PM   #5
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The HW tank has the bypass valve on the back of it. This is what I don't understand. The bypass valves are on the HW tank for draining and adding antifreeze. Why do I need the Anderson HW bypass. The only use I see is it takes the HW tank out of the pressurized plumbing system when the coach is in use.
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Old 09-30-2013, 06:13 PM   #6
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Quote:
Originally Posted by KyDan View Post
He's NOT filling his HW tank.

I drain my water heater and then blow the system out with air.
This removes the water from the bypass area.
Then I close the tank valves and open the bypass and pump the
system full of the pink stuff.

Works for me.
YMMV

I know!
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Old 09-30-2013, 07:46 PM   #7
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The bypass valve is designed to be open with the inlet and outlet valves to be closed to keep the tank from receiving antifreeze during weatherization. HW heaters with antifreeze in them can be harder to flush to get the taste out. Heater still must be drained for the winter if bypassed. I would drain for winter whether antifreeze is added or not.

One does not have to bypass the tank if you so desire.
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Old 09-30-2013, 08:22 PM   #8
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This valve is so during winterizing you can bypass the tank and not be filling it with antifreeze. I drain my tank, then pressurize the water system with air and blow out all the lines, then switch my hot water bypass to shut off the hot water tank and bypass it. Then pump the antifreeze thru the system, less the hot water tank.
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Old 09-30-2013, 08:29 PM   #9
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saves a ton of the pink stuff if you pull out anode rod tank will be empty no reason to put pink stuff in it
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Old 09-30-2013, 08:54 PM   #10
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If I'm reading your post correctly you have 2 separate bypass valves for your water heater. If it was me I would leave the one at the panel normal and use the one right on the tank. That way all your lines are covered.
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