The problem I see with the heated water hose, besides price, is that you still have an unheated water faucet that you hook it too. I just keep my fresh water tank full when it is going to freeze and run on that leaving the water hose unhooked. Works for me and no worry about freezing faucet or the expensive hose.
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof