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