As with the others, there's no need for a heated hose if you fill the onboard water tank and then disconnect the hose. A heated hose is more useful/necessary if full-timing in freezing locales where it would otherwise mean a great many connections and disconnections. (The water connection must likewise be heated up to the spigot, something that is not generally done for places that don't cater to winter seasonal camping. It's a lot easier and less expensive to install frost-free hydrants where the actual valve is below the frost line and actuated by a long pushrod from the hose connection above ground--and such frost-free hydrants will freeze in due time if left turned on and filled with water that isn't flowing.)
You may be limited in where you can camp based on how winter capable your RV is. If the tanks and piping are not heated (either with separate heaters or by being enclosed somewhere within the heated, insulated envelope of the RV), you won't be able to use the water system anyplace where it's below freezing more than a relatively brief overnight dip in temperatures when the daily temperatures are above freezing. It's also generally true that open campgrounds in wintery areas are none too common.