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Old 12-14-2008, 10:25 AM   #1
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Question about gas burner design


I recently scavenged an gas valve and burner from an old water heater. I noticed an odd thing in the design of the burner. The gas line does not connect directly to the burner, instead it ends about 2 inches below the burner plate itself. There is a hole in the gas line, and the gas looks like it rises up through open air, hits the burner plate, flows outward to the burner holes at the edge of the plate where it burns.

So the gas is lighter than air and rises up to the burner without any containment at all? It doesn't dissipate in the open air? How come the gas rising in the open air doesn't ignite? Does it need to mix with air before it can burn?

I've noticed the burner in a wall furnace seems to be of a similiar design, with the gas from the gas valve rising through open air before reaching the burner itself.

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Old 12-14-2008, 10:38 AM   #2
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Question about gas burner design


The design of the ports in the burner causes the air to swirl as it rises and mix with the gas and get ignited at the edge by the pilot light. Uses a venturi effect as well as natural draft.

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Old 12-14-2008, 12:44 PM   #3
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Question about gas burner design


NG needs 1015 degrees and between 5%-15% concentration to ignite. Venturi systems are common and normal.
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Old 12-14-2008, 01:10 PM   #4
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Question about gas burner design


1100 posts. WOW. You guys keep busy. I did over 2000 in several years at H***Mech B4 the spammers killed it. Lots of talent here.

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Old 12-14-2008, 01:37 PM   #5
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1100 posts. WOW. You guys keep busy. I did over 2000 in several years at H***Mech B4 the spammers killed it. Lots of talent here.

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It's a great site. I tell all my friends about it.
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