Have you found the inside access point to your hot water heater? Usually there are arrows showing which way the valves should be facing for winterization. You want to make sure the valve allowing cold water ( should be a blue line ) into the water heater is turned to the opposite position from where you have been using it.
You will know when it is in the correct position when you open your hot water heater plug and water does not flow out at a high rate. Make sure you release the pressure relief valve first or you will be sprayed.
You are obviously lucky to be living in an area where you haven't had to winterize yet. It is 8* here in south Jersey this morning. UGH!
Don and Michele
3 Adult Children - 5 Grandchildren
Present campsite - future homesite