I've been doing HP assessments for 12 years, but find myself a little limited in my knowledge of this issue.

Here's the scenario: I do an initial assessment where I find a 7-year old NG water heater with 1500 ppm undiluted CO. The homeowner brings in his plumber to "fix" it. The plumber, who doesn't own a CO monitor, cleans the burner and air intake grill, and proclaims it good. After work is done on the home, I re-test and find the CO to be even higher this time, and the draft weak.

What typically can be done to a fairly new water heater to fix the CO problem? The gas/air ratio must be out of wack, I'm thinking. Is it usually corrected by replacing the gas control valve?

The homeowner is left hanging, the plumber is without a clue and me telling him it needs to be corrected. I would recommend a different plumber, but I want to find out what a knowledgeable individual would typically do to correct this, short of replacing it. One thing I know is I need to align with a knowledgeable person to address this in the future.

John Shillito

Tags: CO, heater, plumber, water

Views: 687

Reply to This

Replies to This Discussion

I have to agree with Kurt. 2000 ppm is exceedingly high. I have tested hundreds of hot water heater (NG, Oil) and mostly they come in around 16 ppm. There is clearly something wrong and we all know that a gas hot water draft can easily be compromised. 

hey thanks for the links. Very informative on FVIR units

Hello John (and everyone else in the forum),

I'm a new visitor at this forum and it this is my first post. I look forward to more sharing and learning in the future.

The first condition that I would investigate the "weak draft". Is the flame lazy too? Is the equipment in place the same as what the flue was originally designed for?

I find the best place to contact when at a loss is the manufacturer's technical support.

Steve

RSS

Videos

  • Add Videos
  • View All

Twitter

Latest Activity

Judy Rachel replied to Dean Kirkland 's discussion Im looking for a blower door / duct blaster / manometer rental in So Cal
"You can borrow the equipment from the Tool Lending Library maintained by SoCalEdison.  This is…"
9 hours ago
Profile IconSteve Last, Paul J Anzalone Jr, Jon Traudt and 1 more joined Home Energy Pros
23 hours ago
Jamie Medlin replied to angela stanzione's discussion Used Weatherization and auditing equipment for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Please let me know if the flowhood  still for sale. jmedlin@archonenergysolutions.com"
yesterday
Jamie Medlin joined allen p tanner's group
Thumbnail

Energy Auditing Equipment for Sale, Trade or to Purchase

Discuss the pros and cons of the equipment you are interested in prior to purchase. Post equipment…See More
yesterday
Laurie DiDonato posted an event
Thumbnail

HERS Rater Training Discount: Register by 1/6/17 and Get $100 Off! at Energize CT Center, North Haven, CT

January 23, 2017 to February 3, 2017
Become a HERS Rater with the NEHERS Alliance!Online Component: January 23rd-February 3rd, 2017 -…See More
yesterday
angela stanzione replied to angela stanzione's discussion Used Weatherization and auditing equipment for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Yes, I do. Pictures are above. I have a newer fan, I have a frame in a case and I have panels."
Friday
Tom Phillips replied to Bruce Ceniceros's discussion How effective are whole house air cleaners?
"re: costs:  I suspect the added UV & PCO & ESP has a big price tag but no clear…"
Thursday
David Baerg replied to angela stanzione's discussion Used Weatherization and auditing equipment for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Hi Angela, Do you have any fans left?  Frames?  Panels? Thanks, Dave"
Thursday

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service