Without any tank insulation, I have had many nights that dropped below freezing without any problems. One night in November, when the temps dropped to -8°C (17.6°F) did I find some hard slush in the low-point drain line when I went to drain the system in the morning. I just left it a few hours until it got back a bit above freezing, warmed the pipe a bit with my hands, and all was fine.
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2017 Escape 5.0 TA
2015 Ford F150 Lariat 3.5L EcoBoost
2009 Escape 19 (previous)
“Most folks are about as happy as they make up their minds to be.” — Abraham Lincoln
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