Thread: Boiler vent size increase

Is it always the case that the boiler vent size must increase when you add a water heater vent or are there exceptions?

In this case, a 150,000 BTU Boiler with 40,000 BTU Water heater.

I was thinking it needs to increase but wanted to double check.

Thanks..

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Jon,
NFPA 54 is pretty clear on venting 2 natural draft appliances but first,
is it a masonry chimney and if so inside or outside?
chimney size and height?
any other appliances?
what is the connector sizes?
it looks like 3" into 6"?
what part of USA are you in?

Thanks
Jack
MGF 3828
JGF 3910

It is a masonry chimney that is an exterior mount.
The height is approximately 28' - 30'
3" into 6"
No other appliances
Binghamton, NY

Thank you Jack

jon,
what size is the chimney? 12 x 12? 24 x 24?

thanks

jack

12 x 12 is the chimney flue size.

Jack,
were you able to determine the requirements with the information?


Thank you,

JOn