I just had a new furnace installed, it is a direct vent so all I have is my 40k btu 50 gal gas hot water heater to vent. I was wondering if I could use 4" B-vent out of my heater and up threw my roof. It would be about 12' total.
I just had a new furnace installed, it is a direct vent so all I have is my 40k btu 50 gal gas hot water heater to vent. I was wondering if I could use 4" B-vent out of my heater and up threw my roof. It would be about 12' total. Or do I have to go bigger than 4" .
4" is perfectly fine for your application. make sure you use a 4" b-vent roof jack and storm collar and b-vent top. i believe the code specifies 2' above anything within 10' of the vent termination.
C'mon fish. Where'd you come up with that "4" is perfectly fine" mumbo-jumbo? Fact is you are just guessing. You need to consult the gamma tables to get it right.
4 inch may be too big and allow unneeded condensation and improper draw on the vent. You'll notice that using the Gamma tables located here:
formatting link
"4 inch" guess is able to handle anywhere from 70,000 to 112,000 btu depending on theactual lateral and vertical length of pipe which the OP didnt give. The 3 inch will handle 36,000 to 58,000 btu again depending on the actual vertical and lateral lengths. Stop using those "Thumbs" and get the facts. Bubba :-)
There is absolutely no problem venting it that way. As long as the Bvent is interior and not exterior and it does not exceed 6" diameter and your single appliance exceeds 30,000 btu's there is no problem. You must ensure there is no spillage or downdraft.
-Canadian Heat
--
--------------------------------- --- -- - Posted with NewsLeecher v3.7 Final Web @
UUmmmm....Bubba...there a thousands of 50 gallon wh's vented with 4".... Unless it's a 40 gallon low input heater, all 40's and 50's that I've seen in the last 20 years are 4" venting....conventional type of course..
Or Ruud/Rheem which show 3 inch until you get to a 50,000 btu model
formatting link
American also shows only 3 inch
formatting link
So although this really doesnt prove a whole hill of beans I have still yet to find a water heater in a 50 gal gas at 40,000 btu or less that specifically says it only uses a 4 inch flue. Rheem/Ruud and American specifically say 3 inch only. What I cant understand is why you would want to use 4 inch? 4 inch pipe and elbows cost more and its costs even more if you start using 4 inch B-vent and 4 inch flue liners compared to 3 inch. AGAIN, you still specifically need to consult the flue venting tables and 99% of the time the 3 inch flue will work perfectly. I have a 2 yr old Ruud 50 gal 40,000 btu standard gas water heater and it uses 3 inch as specified in the manual and per the draft hood that came with it. Im really not sure what water heaters you have been seeing in the last
20 yrs and DaNgEr................you're still a f***in clueless Canadian idiot. Bubba
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.