Question about Water Heaters

1 Answer

What is proper vent size for my hot water heater

I just purchased a 75 gallon hot water heater to replace my old 50 gallon which had a 3'' draft hood my new heater also has a 3'' hood but manual says larger diameter may be necessary what does the venting code say what do you suggest its a a o smith gas fired heater the exsiting vent is 5 to 6 ft to chiminey who says 3'' is fine others say go to 4'' iam installing it on 11/19/09 someone out there please help.

Posted by on

  • D. Floyd Kolb
    D. Floyd Kolb May 11, 2010

    To make an accurate assessment of your question the BTU's of the burner is needed. That will determine the size of the venting not the gallons. If the BTU's of the larger tank are the same then the 3" will be fine but if the burner has higher BTU's Then you may need to upsize the venting.

×

Ad

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

    Sergeant:

    An expert that has over 500 points.

  • Expert
  • 399 Answers

Go to 4 better to big than finding 3 was to small

Posted on Nov 19, 2009

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My co2 dector sounds alarm near hot water heater


Bad vent
Check the draft (test the vent)
Call service technician immediately.
DIY steps on link below
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#vent

Gene

Water Heater Timers Save Money

Jun 18, 2014 | Rheem Water Heaters

1 Answer

Hot water heater sweeting from top


Water on top of gas heater can be caused by poor venting, or inadequate combustion.
Make sure water is not coming up from under tank top, indicating tank leak requiring tank replacement.
Have a plumber look at problem to make sure home is not filling with deadly, odorless CO gas.
Inspect pipes that they are not corroded and covered with condensate.
Check that roof cap is in place.
Let heater fire and burn for a few moments so the fire is going good, and then light match just outside the draft hood on top of heater. Blow out match and see if smoke draws immediately into vent and upward.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html
http://waterheatertimer.org/Leaking-water-heater.html

Aug 31, 2012 | RHEEM 50 Gallon FVR NATGAS Water Heater...

2 Answers

Cover not sealed would that make polot keep going out


General causes for pilot going out: downward draft of air from outdoors, back-venting of furnace into water heater vent, bad thermocouple, or burner parts need cleaning, or bad gas control valve, or air in gas line.
Water heater in attic: hot attic conditions stop natural flow of vent gas upward.
Open following link for troubleshoot resources and cleaning illustrations and instructions:
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf
Check venting by lighting a match under the vent hood and see if smoke drafts immediately upward.

Jun 25, 2011 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

Size of the exhaust vent pipe on a 75 gallon gas water heater? Is it the same size as on a 50 gallon water heater. Brand is GE, mfg 2008


I believe it takes 4" vent pipe up to 100,000 BTU
BTUs are shown on label side of tank.
http://waterheatertimer.org/pdf/Gas-venting-specs.pdf

Does new water heater have power vent? What does manual say?
Are you experiencing vent problem now? When you light a match and put it under vent stack, does smoke immediately get pulled upward? Are furnace and waster heater connected to same venting. Is there dark exhaust stain around vent hood? Does exhaust vent back out of vent hood when furnace kicks on? Are flue pipes stained with rust and white coating? Are vent pipes vertical, or are there level runs? Are the pipes made of galvanized and screwed together with 3 screws at each joint?

Frankly I would double-triple-check any internet answer dealing with possible CO poisoning at your home.
1) Ask local plumber for specific code in your area.
2) Call gas company
3) Post question on pro water heater forum:
http://www.thetankatwaterheaterrescue.com/forums/forum3/
4) Read whole manual for new water heater before buying.
5) Contact manufacturer.

Add a comment with your experience so others with same-similar problem can benefit.

Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Mar 30, 2011 | Water Heaters

1 Answer

If my 50 gallon water heater is leaking can i replace it with a smaller water heater?


There should be no problem replacing a 50 gallon heater with a smaller size heater as long as the codes for your city/town allow it. You may also need to pull a permit for the installation, check with your municipality. Some codes state that a home with X square feet or whatever measurement they want to go by, will need at least a 50 gallon hot water heater. Obviously all installation instructions and codes apply to any new hot water heater installation.

Sep 10, 2010 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

Extreme hot water then to consistent luke warm


Possible thermostat problem. Are you experienced enough in that area to do some testing. Have a multimeter? If not experienced, don't try it, too dangerous. Call in a service person.

Mar 07, 2010 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

Loud blower on my new Rheem Power Vent 2 water heater


find out if it does the same noise with the venting disconnected

Nov 01, 2009 | Fasco Bradford White Hot Water Heater...

1 Answer

Gas water heater pilot goes out only on very hot days


It sounds more like the pilot is being blown out by drafting.If there is any open shielding at or below the pilot light line , it is very possible for it to blow out.Hold a tissue between your fingers and ck for drafts around the burner and pilot area. If it's the case, The drafting needs blocking.the exhaust will still exhaust because of the heat it generates and confined location in the combustion chamber. Good Luck.

Jun 15, 2009 | Water Heaters

1 Answer

No hot water


Aquastar 1600H NG Natural Gas Tankless Water Heater Bosch AquaStar Model 1600H NG Natural Gas Whole house tankless gas water heater, 117,000 Btu input, natural draft with hydro-generated ignition. Provides endless hot water for one major application at a time . Can replace 40-gallon storage tank water heater. Optional Accessory: Model AQ1- Power vent with built-in... More freeze protection when venting horizontally. Capacity: 1 to 2 Bathrooms Dimensions: 8.75D x 18.25 W x 29.75H Weight: 40 Max GPM @ 45F Rise: 4.2 Energy Factor: NG .80 LP .84 Minimum Input: 28,000 Maximum Input: 117,000 Vent Size: 5 Gas Connection: 3/4 Water Connections: 1/2 Warranty: 12-year warranty on heat exchanger, 2-year on parts Features: Endless hot water Can save up to 50% off utility costs annually Perfect for one major application at a time No standing pilot, hydro generated

Mar 01, 2009 | Bosch 1600H-NG Natural Gas AquaStar...

Not finding what you are looking for?
Water Heaters Logo

Related Topics:

168 people viewed this question

Ask a Question

Usually answered in minutes!

Top Water Heaters Experts

Donni Steen

Level 3 Expert

659 Answers

Brad Brown

Level 3 Expert

15644 Answers

Gil Shultz

Level 3 Expert

3368 Answers

Are you a Water Heater Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...