Do i want to turn sour valve on a hot river container too run my hvac?
Answers: HVAC is heating Ventilating and Air Conditioning (I hope i.e. what you mean)
Unless your hot water reservoir is co-mingled with your heat system you should not have to. But since you are asking, I own to ask you if you really think you are qualified ample to be installing a heating system?
Please explain what a hvac is?