4^F yesterday at dawn West of Hickory, NC is the coldest we’ve ever seen it since moving here in 2014 and for first time ever we had freezing of the pex water pipes entering one of our Rinnai water heater stations (which the original home owners builder plumber for some *sinine reason installed on the exterior brick veneer wall outside the insulated but, unheated garage!
)
I used warm (not hot) air from a blow dryer to get the water moving again and then stuffed custom cut size pieces of R19 insulation in and around the water hoses and fittings.
Very glad I’ve decided to simply shut water off at street main and open the yard hydrant at lake shore (and a good 30’ of elevation below the house) to completely and without question drain the entire house water system when we close the property and winter in FL moving forward; and,
i thought guys advising me to pour some biodegradable rv antifreeze into all toilet, sink and shower traps were taking things too far!