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Plumbing antifreeze??


96 EVO
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Anyone ever researched whether plumbing antifreeze still works properly (won't expand), after being heated by say a AH boiler?

Always wondered if heating the stuff close to 200deg may change it's properties :classic_blink:.

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That depends on the specification of the Plumbing Antifreeze and whether it is POTABLE.  If you use the Pink or sometimes Orange RV Antifreeze, it is potable.  It will protect the AquaHot.  AH does NOT recommend using the AH when it is in the boiler.  BUT, it will protect the system in winter.

Chuck may be making the point that the PINK STUFF must be thoroughly rinsed out....otherwise, you get a little cloudiness and maybe a little bit of FOAM.  The trick is to drain ALL the areas.  That included the ICEMAKER LINE.  I NEVER put in in my Res Refer.  I disconnect the icemaker line at the quarter Turn Valve.  You have to flush every faucet and the W?D and shower and the rear service bay wand and drain the lines there.

Also flush the toilet and use the hand wand to get rid of all of it.  The good news...  It is harmless.  Don't know how it mixes with Burbourn.?  It does take a few days of use to totally get it out....but the alternative is NOT an option.

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1 minute ago, 96 EVO said:

First time I've heard that!

You get a MIXED answer from AH.  I had to had mine serviced....and was worried.  FIRST AH said NOPE.  Then MAYBE....and my tech, who has been trained by AH and is a CERTIFIED AH dealer said it didn't matter.

SO, I don't turn it one.  HOW having said that.  I DO or have done that....just hit me.  If I drive the MH to heat up the batteries, I use the Furnace mode and Genny on the way out (maybe 25 miles)....and then Heat Pump and Genny on the way back.

I THINK there may be a warning somewhere in the manual.....

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Remember, Ben lives in cold frozen north, sometimes called Canada.  It's a long way from South Mississippi.  I'm guessing antifreeze is necessary up there especially if one has an Aqua-hot because it's near impossible to get all of the water out of an AH.

11 minutes ago, Tom Cherry said:

AH does NOT recommend using the AH when it is in the boiler

I didn't know that either, wonder why

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This is a quote from the AH 400 series 'Use and Care guide'..............

Propylene glycol based antifreeze, “Generally Recognized as Safe” by the FDA, must be utilized for antifreeze and water heating solution. · Interior heat can still be used once the water heating system has been drained and winterized. · Use propylene glycol “Generally Recognized as Safe” RV and Marine antifreeze specifically for “winterizing” application ONLY.

 

What I'm curious about is whether that propylene glycol retains it's burst protection after it's been heated, and then cooled.

I'm thinking it does, the same as the boiler fluid does after being heated many, many, times.

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58 minutes ago, 96 EVO said:

 

What I'm curious about is whether that propylene glycol retains it's burst protection after it's been heated, and then cooled.

I'm thinking it does, the same as the boiler fluid does after being heated many, many, times.

Most boiler fluid is propylene glycol based and heating it does NOT change it's burst protection properties.

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Aquahot manual says it is fine to use RV antifreeze, in fact Aquahot recommends it.  I have used it for years, with the boiler on to provide heat.  In Colorado, it often gets below 0⁰F, and if I'm working inside the coach, or loading it to in preparation for a trip, I turn the Aquahot on.  Since i travel all yikes or the year, I winterize multiple times each year when I return from a trip.  I have a new Aquahot 600D curtiousy of the previous owner using only air to attempt to blood out the system. 

  -Rick N 

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2 hours ago, 96 EVO said:

Ouch!

That was a costly mistake he made!

I blow my system out as well. But then follow up with about 4gal of antifreeze.

My technique exactly….

purge with air.  Sometimes two steps.   One to protect it for a while.

next up is to totally winterize

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