Open Flame vs Catalytic Heater - Fiberglass RV

Thread Tools Search this Thread Display Modes
Old 07-29-2008, 12:59 PM   #1
Senior Member
Trailer: 84 16 ft Scamp
Posts: 725
I have an idea this has been addressed before, but I haven't been able to find a reference that addresses it here --

What is the difference between burning propane via open flame versus catalytic heater in regards to:

1) heat output per quantity of fuel used
2) oxygen depletion per quantity of fuel used
3) water vapor generation per quantity of fuel used

The reason I ask is because we let a very old veteran trailer camper friend stay in our Scamp for several days while visiting us. He is too old to camp on his own anymore, but when he arrived he was as excited about our Scamp in the drive as he was about visiting us, so I asked him if he would rather stay in the guest room, or the Scamp. There was no hesitation and you know the answer.

It turned out that he had built several home-built trailers in his younger days about the same size as our Scamp. When it was over he said it was wonderful to have his own little mansion while here. The only adverse comment was why did we not just put a couple of large clay pots over the stove burners for heat rather than go to the trouble and expense to install a catalytic heater.

After considering it for some time I wonder too. For some reason I would guess that the answer to the three questions above is: the same whether open flame or catalytic.


Loren G. Hedahl is offline   Reply With Quote
Old 07-29-2008, 01:49 PM   #2
Senior Member
Trailer: Casita 16 ft Spirit Deluxe
Posts: 361
What is the difference between burning propane via open flame versus catalytic heater in regards to:

1) heat output per quantity of fuel used
2) oxygen depletion per quantity of fuel used
3) water vapor generation per quantity of fuel used
I'll take a cut at it, and expect others will jump in as well. For complete combustion (100% combustion efficiency) of the propane, the amout of heat generated, oxygen depletion, and water vapor generated (and carbon dioxide production) will be identical. That's a simple chemical formala. However, the big difference is that the catalytic heater will get you much, much closer to 100% combustion efficiency than the stove flame will ever be. And the really serious part of this is that incomplete combustion of hydrocarbon gases like propane generates carbon monoxide, and we all know the result of that. I've heard of the clay pot idea, and I guess you could do that before going to bed, ventilating the trailer the same as you would be while cooking, then shut everything down for the night. I'd never ever go to sleep with the stove running. If you trust the catalytic heater to not generate carbon monoxide, I suppose it's reasonably safe to sleep with it on, provided you have enough ventilation to replace the oxygen it uses. I think some folks do that.

Hope this helps.


Parker Buckley is offline   Reply With Quote
Old 07-29-2008, 02:44 PM   #3
Senior Member
Doug Mager's Avatar
Trailer: 1975 13 ft Trillium
Posts: 2,536
What do you think of using a small Alec Tric micro-furnace instead? Less chance of fire, etc.
Doug Mager is offline   Reply With Quote
Old 07-29-2008, 03:34 PM   #4
Senior Member
peterh's Avatar
Name: Peter
Trailer: 2005 19 ft Scamp 19 ft 5th Wheel
Posts: 1,519
Both Doug & Parker make good points. When we have hookups Lynne and I drag out our electric cube heater, which uses no propane, so it makes no water vapor, consumes no O2, and creates no carbon-dioxide or carbon-monoxide and even has a built-in thermostat.

As for open-flame combustion, they create almost exactly the same amount of water vapor and carbon dioxide as catalytic or ceramic heaters do, but open-flame combustion (like on a stove top) burns less efficiently. Whenever you see a flame that has a yellow or orange fringe, that means the combustion process is incomplete,m so you're not getting all the heat you could out of your pound of propane; worse yet, that inefficiency means the flame is creating deadly carbon monoxide. I'm OK with using a ceramic (e.g. Mr Heater Portable Buddy and others) heater, which burns very efficiently and has an entirely blue flame once it warms up, but I'd never use an open flame or stove-top flame, which always have yellow or orange fringing for space heating.

Beyond that one point, catalytic systems offer advantages open flame and ceramic heaters do not. Catalytic heaters put out the same total amount of heat per pound of propane burned, but spread the combustion process out over a larger area so they don't burn as hot. That means you can sit closer to a catalytic heater without getting fried on the side facing the heater and the larger heated area allows more air to warm as it passes by the face of the heater, allowing the heat to circulate around the trailer more evenly.
peterh is offline   Reply With Quote
Old 07-29-2008, 11:44 PM   #5
Senior Member
Pete Dumbleton's Avatar
Trailer: Scamp
Posts: 3,072
Send a message via Yahoo to Pete Dumbleton
The difference between the clay pot system and the cat or vent-free systems is that the clay pot has zero safety built in esp in the case of oxygen depletion (cross ventilation to replenish oxygen is a USER responsibility).

Forget the noxious gasses that can be part of all the combustion processes; the clay pot flame will be burning on long after the sleeper has expired from lack of oxygen and I doubt that either a CO or CO2 alarm will have sounded.

All the clay pot does is change the range flame heat to radiated heat.
Pete Dumbleton is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Northstar Flameless Catalytic Heater Gail S. Problem Solving | Owners Helping Owners 3 11-06-2008 11:43 AM
Catalytic Heater william russell Classified Archives 1 07-30-2008 09:32 AM
Catalytic Heater Installation Nancy A. Problem Solving | Owners Helping Owners 0 06-27-2008 11:54 AM
Catalytic Heater Question: Do they smell? peterh Problem Solving | Owners Helping Owners 6 04-21-2008 09:10 PM
Portable catalytic heater Paula Bindrich Problem Solving | Owners Helping Owners 19 10-13-2007 04:53 PM

» Upcoming Events
No events scheduled in
the next 465 days.
» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:16 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.