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Old 01-18-2017, 09:25 PM   #15
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2 gallons on boiler antifreeze is alot to have lost, your float switch should have cut off when you lost a gallon.
The rules for which antifreeze do I use are simple, If your domestic water line enters the glycol tank, you need propylene glycol. usually pink, non toxic. If your domestic water lines are coiled around and do not enter the glycol tank you can use ethylene glycol. moderately toxic. Also there should be a caution tag on the drain valve hard to get to, between burner head and circulation pumps, bottom front.stating if you need to use propylene
After adding 2 gallons of glycol you really need to check with a refractometer as boiler antifreeze is usually unmixed at -100 degrees and you want -15 to -25 degrees for optimum heat transfer.
Also slope parking will not cause any glycol to leave your boiler tank as it must overcome 13 psi to raise the radiator seal and exit overflow tube. only operating the unit will create enough pressure for fluid to be able to exit. Your overflow tank is part of the system and fluid will travel between the two. your overflow tank should have a cold fill mark and a hot fill mark.
As far as maintaining the glycol, Brown color doesn't mean bad. as long as it's -20 it's good. I recommend a yearly service,which should monitor the temperature and adjust if needed to -20 and a flush every 10 years.
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Old 01-19-2017, 07:16 AM   #16
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Quote:
Originally Posted by Boyd R View Post

My coach was parked in my driveway last weekend, and not level. It was sloped with the front lower.

It was 17 degree so I fired the aqua hot to start warming the coach up for the trip to Florida ( in Jacksonville now ).

My aqua hot started pushing some fluid out the over flow, only reason I have is the downward slope it sat on.
Your Aqua-Hot is a CLOSED pressurized system. It should NOT loose any fluid when parked on a slope.

When the fluid is COLD the level in the expansion tank will be LOW. When the fluid is HOT the level in the expansion tank will be HIGH.

As the boiler coolant heats up it will EXPAND into the expansion tank. As the boiler coolant cools off the fluid will retract back into the boiler tank.

The objective is to keep the levels between the hot and cold levels.

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Old 01-19-2017, 10:03 AM   #17
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The newer Aquahot systems are not pressurized.
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Old 01-19-2017, 10:30 AM   #18
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Good morning, where can I buy the Century Fluid? Because I'm on the road, I can't use Amazon.
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Old 01-19-2017, 10:59 AM   #19
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The newer Aquahot systems are not pressurized.
Yes, you are correct! All of the newer AH units have no radiator cap. Not sure why it had one to begin with seeing that the new units work fine without one.

I guess the overflow/expansion tank would work the same regardless of whether it was pressurized or not providing the level in the boiler tank is FULL.

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Old 01-19-2017, 08:32 PM   #20
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Good morning, where can I buy the Century Fluid? Because I'm on the road, I can't use Amazon.
On the road, a Winnebago or an Entegra dealer or a mobile Aqua Hot tech that you might see in an RV park. Outside of those, it will be hard to find.
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Old 01-20-2017, 05:04 AM   #21
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Good morning, where can I buy the Century Fluid? Because I'm on the road, I can't use Amazon.
Don't see why you can't use Amazon or Roger Berke who also has Century boiler coolant while you are traveling.

I traveled around the country from as far south as Key West FL to as far north as Fairbanks AK for almost 7 years and Amazon was my main shopping center for all those years and still remains as my go-to place for products. Prime member and 2 day free delivery, sometimes one day delivery, you can't beat it!

If you have access to the Internet which appears that you have since you are posting on iRV2.com then you have access to Amazon.

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Old 01-20-2017, 05:39 AM   #22
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Don't pay an arm and leg. I just ordered 2 gals off Amazon for $22 a gal. I was surprised, I think a yr ago it was going for three times that.
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Old 01-20-2017, 06:21 AM   #23
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Century Fluid must be tied to the stock market, it is up and down like a yo-yo. Last gallon I paid over $30. Tadd paid $22. today it is $24. I noticed the seller on Amazon is Century Fluid themselves. https://www.amazon.com/s/ref=nb_sb_s...ler+antifreeze

Now that I am out of warranty my next fluid change will not be with hard to get, expensive Century Fluid
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Old 01-20-2017, 09:00 AM   #24
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Aqua Hot also sells it on their website. Green fluid is currently $27.10/gallon plus shipping. Not the cheapest, just another source.
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Old 01-20-2017, 09:09 AM   #25
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Good morning, where can I buy the Century Fluid? Because I'm on the road, I can't use Amazon.
Any plumbing (Plumbers) supply store - it is what is used in boilers with water heater coils - "Safe" not deadly.

Safe is the Key word.

Best of Luck,
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Old 01-20-2017, 09:22 PM   #26
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Green is usually Ethylene Glycol type
Prestone LowTox is green Propylene Glycol. Looks like fluid color has no correlation to chemistry.
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Old 01-20-2017, 10:04 PM   #27
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Prestone LowTox is green Propylene Glycol. Looks like fluid color has no correlation to chemistry.
Thanks to your successful testing, guess which one I will be switching to when it comes time to change fluid.
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Old 01-21-2017, 05:59 AM   #28
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Caution: Before switching over to Prestone Low-Tox Propylene Glycol Coolant, I would read through the SDS sheet and compare it to the SDS for the Camco Boiler Coolant SDS.

Prestone Low-Tox SDS

Camco Boiler Coolant SDS

I could not find a SDS for the Century Boiler Fluid.

My take after reading the SDS sheets is that one is safer than the other.

Plus I just realized that Roger Berke is no longer carrying the Century Fluid. There must be a hidden reason as it Aqua-Hots preferred fluid with the Aqua-Hot brand stamped right on the front of the label.

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