DIY Home Improvement, Remodeling & Repair Forum > Appliances > Water Softener and Heater > LP hot water heater problem

Thread Tools Search this Thread Display Modes
Old 01-02-2013, 03:38 PM  
Junior Member
Join Date: Aug 2012
Posts: 11
Default LP hot water heater problem

We have a problem with exhaust coming back out through the draft hood on top of our LP gas water heater. It is pretty cold outside about 15 F degrees. We have single wall pipe on the interior and double wall pipe on the exterior, this pipe runs outside the house and it’s about 4 or so feet above the edge of the roof/gutters and it is capped. The pipe inside, above the water heater also has condensation on it and feels kind of cold. Our basement it around 60-65 degrees. There is no blockage in the vent pipe. We also have a CO detector which the alarm HAS NOT gone off due to this. I do realize the danger with the CO and the tank is on vacation mode. This has happened before when it is really cold. Once it warms up outside the issue resolves itself.
Any ideas on how to fix and what caused this to happen would be appreciated. Thank you.

Last edited by lhort; 01-03-2013 at 08:17 AM.
lhort is offline  
Reply With Quote
Old 01-02-2013, 04:14 PM  
Join Date: Jan 2010
Posts: 2,328
Liked 168 Times on 155 Posts
Likes Given: 94


You might try
a thermostatically operated exhaust fan for forced air or
a thermostatically operated heat source for convection, like a small bulb.
The t'stat would sense outside temps.

With the bulb you can experiment as to size but if the bulb is small enough it may not pay to control it with a 'stat.

I though CO was the main danger, not CO2, but CO2 is considerably heavier than air.

You might also have an exhaust fan somewhere in the house that is pulling the LP exhaust back into the house.

Last edited by Wuzzat?; 01-02-2013 at 04:21 PM.
Wuzzat? is offline  
Reply With Quote
Old 01-02-2013, 08:26 PM  
Junior Member
Join Date: Nov 2012
Posts: 25
Liked 1 Times on 1 Posts


Warm air rises. So when you have a cold chimney, you get what's called a downdraft because all of the cold air is being forced down the chimney. When it's warm and the chimneys warm then the air will be going up the chimney
ajr4997378 is offline  
Reply With Quote
Old 01-03-2013, 08:17 AM  
Junior Member
Join Date: Aug 2012
Posts: 11

Thank you. My mistake, CO not CO2.
lhort is offline  
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
Water heater thermostat problem SBay_ecologist Plumbing Forum 3 02-14-2012 02:46 PM
MUST I replace a hot water heater that got water damage from Hurricane Irene? Seidperson Plumbing Forum 2 09-12-2011 07:12 PM
New water heater problem-wife ready to kill me. ron3637 Plumbing Forum 11 11-20-2010 08:47 AM
can I reuse hot/cold water flex lines on gas water heater? gordon Plumbing Forum 2 12-14-2008 01:16 PM
strange electric water heater problem chuckhooker Plumbing Forum 1 11-25-2008 02:01 PM

Newest Threads