I recently purchased a Takagi TK1S, I am preparing to have this installed soon. My question is this: my existing tank (located in my basement) has 3" exhaust that goes into the chiminey stack, can the new venting replace this? Does the venting only need to enter the stack or does it need to be piped all the way to the roof? I hope this makes sense. I have a couple photos if that will help, unfortunately I cannot post them here, so I will email if needed. Thank you.
-Jimmy