09/04/2026
There is a part on your gas water heater almost nobody knows about, and it is the one doing the most important job in the whole appliance. 🔥
Look at the very bottom. That flat perforated screen under the burner is a flame arrestor. Every gas water heater built since about 2003 has one. Its job: if gasoline, paint thinner or any flammable v***r ever spills across the floor and reaches the heater, that screen stops the flame from traveling back out and igniting the room. It is a fire stop hiding under your water heater.
It also has a second job. All the air the burner needs comes up through those little holes.
Here is where it goes wrong, and you can see both sides in this photo. On the left the holes are open, air moves freely, and the flame burns tight and blue. On the right, lint, dust and pet hair have matted over the screen. The burner cannot get enough air, so the flame goes lazy and orange, it lays soot on the bottom of the tank, and the heater works harder to make less hot water. A flame burning like that is also making carbon monoxide it should not be making.
The good news is this one is mostly on you, not on us. Keep the area around the base clear. Do not stack boxes, laundry or a litter box against it. Run the vacuum hose around the bottom of the heater a couple times a year. That is genuinely the whole maintenance.
If you look at your burner and the flame is orange instead of blue, or you see soot around the bottom, stop and have someone check it before your next load of laundry.
Go look at yours tonight. Blue or orange? 👇
Golden Plumbing, Louisville KY
(502) 264-6053