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I have a Versa Hydro (HTP) on a new install it is the only source of heat in the home. The homeowner goes on vacation 3 weeks in the cold of winter. During this time he is in the habit of shutting the water off to the home. My question is if i have no draw from the domestic side for that period of time will air come out of solution and allow air to cavitate my hot side of the heat exchanger? and follow that question with how do i stop it? Thank-you in advance, Scott