Originally Posted by Edena
I'm new to RV-ing and I'm looking at winterizing my FW with the recommended method air blower + AntiFreeze in the lines.
Looking to buy AF, I found out that there are multiple types. The commonly recommended is propylene glycol to avoid taste and smell in the lines (in opposition to ethanol based).
The next question is about the temperature capability: -50F or -100F.
To be noted that -50F AF notice indicates that it solidifies at ~12F.
Some users report expansion of the AF still damaging their lines or faucets.
What is this forum recommendation?
Just got an rv this spring, so don't know much about rv antifreeze yet. After reading your post I did some research as I need to winterize soon.
I deal with glycol in hvac systems. We don't have to deal with expansion as the fluid is usually moving thru the system and has an expansion tank. So never thought of expansion causing issues in an rv, but appears it can.
Below is a chart from Dowfrost RV Antifreeze. Each manufacture should have their own charts for their product. It lists the freeze and burst protection by volume, which I believe is what you refer to as expansion damaging lines or faucets.
If I understand the chart correctly, the expansion or burst protection has to do with the mixture of water to antifreeze. May also pertain to the quality of the antifreeze product.
By the Dowfrost chart, if you had a mixture of 36% antifreeze to water the freeze protection would be to 0°F and the the expansion/burst protection would be to -40°F to -60°F.
Dowfrost states freeze protection below -60°F with a burst protection of -100°F for their product. So a 60% mixture should be close to -100°F of expansion/burst protection.