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[Fuzz]

The pipes marked with red tape or paint carry hot water; blue denotes cold water. There will be a length of pipe joining the red and blue systems ie; the bypass route which will have a manual valve along it's length. For winter storage, make sure this valve is open. There will also be a manual valve in the pipe marked blue (cold water). For winter storage, close this valve (to prevent antifreeze from entering the hot water tank). Downstream of the water heater (pipes marked with red), there will either be a manual valve or a one-way check valve. If there is a one way check valve, no action is required either for summer or winter. Otherwise, close the manual valve to prevent antifreeze from entering the hot water tank by the back door (so to speak). The idea here is not to waste plumbing antifreeze where it is not needed ie; in the hot water tank. But of course, all water must be drained from this tank to prevent freezing. And all water must also be drained from the fresh water system to include the tank, pump and all lines, faucets, shower heads, watermakers. etc. After that one may fill the fresh water system with plumbing antifreeze. Do NOT use automotive type antifreeze as this is far too toxic to be in your drinking water.