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One other thought to give some margin for safety...
Depressurize the system at night (for coldest temps).. Water pump off and open a hot and cold faucet. Can still use water anytime - close the faucets and pump back on.
The key (as I just said in another thread) is room for expansion... A depressurized system will have more room to expand if things starts to get 'slushie'.
The other old house trick was leave faucets dripping in areas of concern... flowing water takes more to freeze - but wastes water - and not practical in RV without city water and sewer connection.
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Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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