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I'm OCD - so I blow down all the lines at 40 - 45 psi, then pump the pink antifreeze. Never had issues even though the Texas deep freeze....
For the OP - I would think you could get a check valve for your hot water tank at the parts department at most any RV dealer.
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 Lee, Edith, Lil' Bit & Cuddles
22 MHC 331RL, Surge Guard 35550, SumoSprings, Kodiak disc brakes, 412Ah Lithium, Gen 3 Goosebox, Sailun 85s
22 Ram 3500 CC DRW 6.7 CTD Herrin Hauler Classic Bed, 45 gal AUX tank
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