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-   -   Maximizing heat from your outdoor fireplace (http://www.fornobravo.com/forum/f36/maximizing-heat-your-outdoor-fireplace-19986.html)

caspian 09-30-2013 10:02 AM

Maximizing heat from your outdoor fireplace
 
I found this out by accident.

You can double (or more) the heat from your fireplace by insulating the walls and using thicker firebrick.

Here's how I found out. I have a ~5 foot wide outdoor fireplace. I had it lined with 1/2 thick firebricks. The firebricks weren't enough to protect the CMU from the heat and the CMUs stated cracking.

To remedy the heat issue, I pulled out the splits, insulated with 1" KFAC-19, then put a layer of full size firebricks to line the fireplace.

I had the fireplace in operation for one year in the old configuration so I have a pretty good gauge of the heat output. With the new configuration, I can honestly say there is a minimum of 2X the amount of heat output.

Obviously I don't have any controlled tests of scientific before and after tests, but it is WAY hotter.

I am guessing it is a combination of the almost zero heat loss through the sides and back combined with the heat retention of the full size bricks.

Regardless, If you are building new, I would suggest spending a few extra bucks and insulating full bricks. The heat benefit and protection from potential problems down the road are way worth it.

Regards,
Chris


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