Hi, I am a newbie to the forum. I have a Bradford White water heater with a separate space heater outlet. I plan to connect it to a heat exchanger. I have a couple questions that need some professional help as this is a DIY project 1. The diagram in the manual shows that when the outlet is used, a vacuum breaker needs to be installed on the cold water supply line. By vacuum breaker, I assume the manufacturer meant vacuum relief valve. I thought heaters with a top-feeding setup all have a built-in back-siphon prevention mechanism. And valve is only present in the diagram with space heater outlet connected. I called the manufacturer but the support guy couldn't give me a straight answer. 2. There is some sort of a plug in the space heater outlet connector, how is it supposed to be removed/taken out? I have attached pictures showing the diagram and the outlet connector. Thank you in advance for your assistance.