The banner above is an advertisment - if it asks you to download software, please ignore.
Site News - 7/1: Members: Log In to See Fewer Ads! | 5/28: SAAB Evolutions/TSN T-Shirts $14
[General | Members | C900 | 9000 | NG900 & OG93 | 93 | 95 | NG95 | 99 | Sonett | Vintage Models | Clubs | Other Cars | FAQs | Gifts | Member Photo Galleries | Member Directory | Classifieds | Manuals | *Buddy Registry | *Mileage Registry | Polls | What's New | Raffle | Photo of the Month | Sponsors]

General Bulletin Board
[Subscribe to Daily Digest]
(Search Author's Posts: e.g. Keyword:username)*Members Only

[Main General Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Re: Flue gas chimney
Like This Post: - Subscribe to Daily Digest for this Bulletin Board
Posted by Dean [Email] (more from Dean) on Sat, 24 Nov 2007 08:08:35 Share Post by Email
In Reply to: Flue gas chimney, yaofeng, Sat, 24 Nov 2007 05:29:14
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup

Start with a small hole that you can recover from or live with under a picture frame. With a flashlight and mirror, look for pipes or electrical cables that are in that space. Near by electrical outlets are also a clue. Look at the wall from the other room as well.

One can also find drain pipe vents going up through a wall. Inspections from an attic or basement can sort some of that non-destructively.

Determine if the wall is load bearing before you get started.

There are some gas water heaters with fan powered exhaust discharge to go outside. That replaces the convection gas transport of the chimney. These can be complex with interlocks that prevent the burner from coming on until a motorized damper 'door' limit switch indicates that that is open. There can be a purge cycle where air is drawn before ignition, to avoid an explosion in the heater if the gas shutoff valve has a leak. There may be an interlock switch that detects that the fan is actually moving air. If there is a power failure, you cannot make hot water. There is probably not going to be a pilot light, but spark ignition of a start pilot and an interlock to detect a flame there before turning on the main burners. This has all of the complexity of a gas furnace and may share some common components. The gas discharge will be quite hot, not cool and damp like a condensing furnace. The exhaust pipe will be metallic, perhaps stainless and there will be a specific discharge fitting for penetration of the exterior wall.

There might be some heaters that have a plastic discharge that can manage the heat, but that idea might be trumped by considerations of a fault in the system leading to much higher temps than normal. And plastics can become brittle with time and higher temperatures.

A basic gas water heater is passive with no complex controls, interlock switches and motors. It will work when there is a power outage. Water tanks do not last forever. I would be concerned that all of that complexity and expense would have a life-time limited by the life of the tank. If the tank could be replaced and the most of the controls, fan motor and damper motor could be transferred to a new tank, I would be comfortable with that.

A gas water heater with a forced convection fan may not be silent. I know someone with such a heater and it makes more noise than one would want if there is any basement living space.
Posts in this Thread:
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup
Post a Followup

No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.

Name: Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
E-Mail: (Optional)
Re-Enter E-Mail: (Confidential & Secure - Not revealed to other users!)
Note: Please check your spam folder for BB responses.

Subject:

Posting rules are simple - No for sale/wanted ads may be posted here - use the site classifieds.
You may not cross-post your message to multiple BBs.
Not permitted: political/religious topics and being disrespectful (personal attacks, insults, etc...).
 Site Members do not see any red text, inline ad links, bottom of page anchor ads, box ads, or anti-spam check.

Message: (please no for sale/wanted classifieds - post those in the Saabnet.com Classifieds)
Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).

Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post above, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).
Optional Link: (e.g. http://www.saabnet.com/)
Link Title: (Optional)
Optional Photo/Image Link: (e.g. http://www.saabnet.com/img.jpg)
Photo/Image to Upload: (Please be patient while file uploads)



StateOfNine.com
SaabClub.com
Jak Stoll Performance
M Car Covers
Ad Available

The content on this site may not be republished without permission. Copyright © 1988-2024 - The Saab Network - saabnet.com.
For usage guidelines, see the Mission & Privacy Notice.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]

Random Saabnet.com Member Gallery Photos (Click Image)
This is a moderated bulletin board - Posting is a privilege, not a right. Unsolicited commercial postings are not allowed (no spam). Please, no For Sale or Wanted postings, SERIOUSLY. Classifieds are to be listed in The Saab Network Classifieds pages. This is a problem solving forum for over 250,000 Saab owners, so expect to see problems discussed here even though our cars are generally very reliable. This is not an anything goes type of forum. Saabnet.com has been a moderated forum since 1988. For usage guidelines, see the Saabnet.com Mission and Purpose Page. Please remember that you are not anonymous. Site Contact | Site Donations | Other Sites by SP - Poverty2Prosperity.org | Run Club Menlo Park | ScreenBot


Site Members do not see red text instructions, bottom of the page anchor ads, or box ads.
Click here to see all the Site Membership Benefits!