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: 424

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

RSS

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Susan E. Buchan posted an event

EEBA Excellence in Building Conference at Doubletree Union Station Hotel

September 23, 2014 at 8am to September 25, 2014 at 2pm
19 minutes ago
Rem Husted replied to Andy Gostisha's discussion Disguising Ductless Heat Pump Units
"I think most consumers wouldn't want a big box called a refrigerator or a stove or…"
36 minutes ago
Scott Katznelson replied to Scott Katznelson's discussion Database of zip code or county by climate zone
"You know those maps you can find for energy code climate zone specific reference.  That's…"
1 hour ago
JEFFREY M HUGO, CBO replied to Richard Beyer's discussion Sprinkler Mandate Debated.. What do you think should be done?
"Fire sprinklers operate when the fires are small. Typically it only takes approx 20 gallons per…"
1 hour ago
Scott Katznelson replied to Scott Katznelson's discussion Database of zip code or county by climate zone
"Thanks.  That's the best source I've yet found, and maybe the best that's out…"
1 hour ago
Diane Chojnowski replied to Scott Katznelson's discussion Database of zip code or county by climate zone
"I posted the question on HEP's facebook page and Bill Spohn commented: Try…"
3 hours ago
Profile IconKevin Jordan, Hannah Strong, Rich Snyder and 1 more joined Home Energy Pros
21 hours ago
EnergyLogic Academy posted events
21 hours ago

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service