What is the maximum size vent that can be used with a 40000 BTU water heater? We just got a high-efficiency boiler installed which vents directly thru the side-wall.
We also replaced the old 63000 BTU water heater with a new 40000 BTU model. The draft hood of the new water heater is only 3 inches in diameter. The new water heater is now the only thing that is venting thru the old 20 foot long venting pipe to the roof, which is 6 or 7 inches in diameter. Is this too big to vent properly? How difficult is it to install a smaller diameter liner into the old pipe?
2006-12-04 17:37:47 · 8 answers · asked by zijlstra 2 in Home & Garden ➔ Maintenance & Repairs
The 30 , 40 or 50 gallon water heater (non comercial) only needs a 3 in. i.d. pipe they do make a reducer from 6in to 3in the pipe should run vertical as much as possable. 6 inch pipe would cause the exhust to flow slowly and may cause problems in high wind areas.
Our local codes wont allow the use of side vents through the walls but in your area they may.
The installation manual with the heater should tell what vent sizing is acceptable with that particular heater.
You may try a test fit of the new pipe as some of the (brands) pipes are differant in O.D. you may luck out and be able to slip the new pipe inside .
2006-12-04 17:58:58 · answer #1 · answered by Robert F 7 · 0⤊ 0⤋
Water Heater Vent Size
2017-01-01 11:52:50 · answer #2 · answered by ? 4 · 0⤊ 0⤋
Change everything all the way to the water heater. At that piont, put in a reducer. This way when you get a new heater all you have to change is the reducer and maybe the last section of pipe. Before you do anything you may want to see what your new heater vent takes. My water heater has a 3" pipe tied into the furnace with a (Y). You may not have to do any changes.
2016-03-13 03:34:01 · answer #3 · answered by Anonymous · 0⤊ 0⤋
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Existing heater vents using 3" vent. YES, you can transition that 3" vent to 4" somewhere up the line. Matter of fact, just about anywhere that is most feasable for you. Going from 3 to 4 is no problem. If that were reversed then it would be against code.
2016-04-03 05:22:41 · answer #4 · answered by ? 4 · 0⤊ 0⤋
you can vent that water heater through the existing flue just figure out what size it is and buy a reducer to 3" run the vent from the water heater to the existing and use the reducer to connect to the existing
2006-12-04 23:23:10 · answer #5 · answered by plumbinmonkey 2 · 0⤊ 0⤋
All your information should be with your heater or from the manufacture or, the dealer. How hard is it to push a small pipe through a large one? reduce it.
Check with you local codes and building at the County level, everyone has to give their two cents you know. They should also have information on the heater.
2006-12-04 23:32:12 · answer #6 · answered by cowboydoc 7 · 0⤊ 0⤋
you should have asked this question to the store that you purchased the water heater from. it's been my experience that the vent size opening on the water tank is adequit.
2006-12-04 18:09:24 · answer #7 · answered by badbill1941 6 · 0⤊ 1⤋
PSEG says I need a 4 inch vent pipe....is this true
2013-10-08 05:40:33 · answer #8 · answered by chris b 1 · 0⤊ 0⤋