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: 697

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

Featured Forum Discussions

Too many BTU's. Too much horsepower?

Started by Steve in General Forum. Last reply by Eric Kjelshus on Saturday. 4 Replies

Stack/wind pressure and flow networks.

Started by Daniel James Grundy in Training. Last reply by Daniel James Grundy Mar 23. 5 Replies

BDT with vermiculite in hollow CMU walls?

Started by Brad Cook in General Forum. Last reply by John Nicholas Mar 23. 2 Replies

Videos

  • Add Videos
  • View All

Latest Activity

Adrian Sheils liked Home Energy Magazine's blog post The Elephant in the Room
8 minutes ago
Adrian Sheils liked Sarah OConnell's blog post Crowdsourcing for Innovation
8 minutes ago
Chris Dorsi commented on Home Energy Magazine's blog post The Elephant in the Room
"This was a great session, witness the fact that we had to schedule a second showing to accommodate…"
10 hours ago
Chris Dorsi liked Home Energy Magazine's blog post The Elephant in the Room
10 hours ago
eric anderson added a discussion to the group Energy Auditing Equipment for Sale, Trade or to Purchase
Thumbnail

Equipement still for sail (what is left from what I was selling before)

For some reason I can't reply to my previous thread.  I sold the blower door and duct blaster/flow…See More
17 hours ago
Mark Sackerson 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
"Angela, Do you have any blower door sets left? mark"
18 hours ago
Mark Sackerson replied to Jeffrey Anthony's discussion Blower Door Kits in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Jeffrey, do you have any blower door kits left? mark msackerson@franzoso.com"
18 hours ago
Mark Sackerson 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
18 hours ago

Home Energy Pros

Welcome to Home Energy Pros – the unique digital community by and for those who work in the home energy performance arena.

Home Energy Pros was founded by the developers of Home Energy Saver Pro (supported by the U.S. Department of Energy) and brought to you in partnership with Home Energy magazine.  Home Energy Pros is sponsored by the Better Buildings Residential Network. Please honor our Guidelines

© 2017   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service