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Hi, there is no transfer pump, however there is a bypass used for winterizing. inside go to the back of the waterheater, and see if you can locate the plumbing to it, you should see a couple of valves that allow water into, then out of the waterheater, in the bypass mode the water does not come out of the water heater. Take a look and let me know what you see
This is directly behind the waterheater, here is a photo, yours may be a bit different, yet the same