Dallas,
Your tank heaters do not do anything to protect your lines. You are likely good without running your furnace unless you have sustained temps (over a 24 hour period) below 20 degrees. The furnace is the only thing that really keeps the lines below the living area warm.
Winter is one of the best times to get out, don't let fear of freezing lines keep you away.
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Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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