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I have an orange flame in all my gas appliances (gas furnace, gas water heater, and gas stove) and cannot seem to determine the cause.

Background

So far, I have had the gas company come out. I had an appliance tech look at our stove, and tomorrow, I am having a guy check it out on the furnace.

When the gas company (XCel energy) checked it out yesterday, they measured the pressure on with appliances running and without. In both situations things measured fine. Our meter was making some noise, so the gas company put in a new one. They also measured Carbon Monoxide (CO) levels and found nothing wrong throughout the house.

Today, I had an appliance tech come check it out. He checked our stove and he said everything checks out fine. He also checked CO levels throughout the house. In any case, his tests revealed no cause for the issue.

Tomorrow, I am having a furnace guy come in, this is the big one, because the orange flame seems to be causing the furnace to short cycle.

My hypothesis

My hunch is that something must be entering the line elsewhere. No gas inside the house makes me think the natural gas lines coming into the house have the problem. However, the gas company says everything is fine.

What I am looking for

Anyway, I am seeking direction on the course of action to take here. From my perspective, I cannot see how all three appliances would have issues that cause an orange flame at the same time. This seems very clear that something is going on with the gas lines, but I am at a loss of who to call to actually fix the core issue.

Tester101
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Terry
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2 Answers2

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It is (very) surprising that the gas company (Xcel) says "everything's fine." This document from a different gas company certainly calls out non-blue flames as an issue that needs to be resolved. As does this site. And Xcel themselves.

Happening on all appliances does seem a bit less likely to be "and suddenly the air adjustments on all three went whacky" than a contamination issue - possibly water in the gas line?

I wonder how your furnace tech visit went, and what your neighbor's flames look like.

Editing post-comments: Ultrasonic humidifiers make small water droplets (without evaporating the water first) and then those small droplets evaporate while floating around - if the water contains salts or minerals, any salts or minerals in the water will end up floating around the house as tiny specks when the water evaporates from the tiny droplets. Those, evidently, are what is contaminating your gas flames as they are sucked in along with the air required to burn the gas. Old-style "sponge" dehumdifiers (should) only result in water vapor in the air, as they actually evaporate the water (and this eventually leads to a build-up of scale and salts in the humidifier and its sponge element, as those do not evaporate.)

Ecnerwal
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The quick answer is that the humidifier/vaporizer causes the orange flame. This happened to us a couple of weeks ago. The gas company said they would send over a technician. He called us first to confirm our orange flame. He asked if we recently turned on a humidifier/vaporizer. We had. We shut it off and things went back to normal in an hour or so.
I am surprised other gas companies did not know this and I'm surprised my company did not include this in their monthly mailings.

Mazura
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Joe G
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