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Question DetailsAsked on 3/15/2014

my furnace and hot water heater keep going out we put a screen on the chimmey still going out

my furnace and hot water heater goes out any time there is a little wind but i thought it was fixed when we put a screen on the chimmney no heat right now or hot water

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4 Answers


Sounds like gas pressure problem. Check to be sure that the pipe size is adequate for length of run and appliance requierments. The vent cap is not likely to affect the pilot light.

Answered 6 years ago by classicchimney


If the problem is happening only when the wind blows a likely solution would be to raise the chimney. Is this a new problem or has it been happening as long as you lived there? You probably need to have it evaluated by a certified chimney sweep.

Answered 6 years ago by Jim Brewer


Screen would make little or no difference to wind with respect to drafting the exhaust duct.

Probably a vent pipe outlet that is too close to roof, and getting drafted by wind creating suction as it passes over roof - outlet must be above elevation of top of roof, and in some jurisdictions code requires 2 or 3 feet above ridge elevation. Or, maybe has a fixed cap on it that is directing wind down the duct, blowing out the flame.

They also make caps for furnace exhaust duct that reduce the effet of wind - google this search phrase - furnace exhaust duct draft resistant cap image

then click on the google images link that comes up (first when I did it), and the first three rows of images show several types - baffled, and pivoting with the wind type.

Another possibility, as other comment said, is gas pressure is off, or if you mean the pilot blows out, maybe that is adjusted to low in the flame or has inadequate pilot flame pressure at both devices - unlikely to be in both, so probably duct cap issue.

Either way, you need a qualified HVAC contractor (not just a repair tech) to assess the issue and come up with solution.

Answered 6 years ago by LCD


One thought I spaced on when answering this one - obviously moot question by now but in case other people see this question when looking for a solution to their problem:

If the appliances vent into a fireplace chimney, rather than using ducting up through an unused chimney to above the roof, that is illegal - for this specific reason, amongst others. Venting into a wide open fireplace chimney gives way too large a duct flue, which can push or pull a tremendous draft through the furnace - I have seen cases where it pushed the fire completely out of the firebox into the surrounding room and set fire to the room, and a number of cases where the surface the furnace or water heater sat on and the lower part of the appliance were thoroughly scorched due to blowout from this cause. The appliance flue ducting from similar fuel-fired appliances (say gas watewr heater and furnace or boiler) ON THE SAME FLOOR can commonly be merged into one larger metal flue duct running to the roof, but generally combining appliances on different floors is prohibited in most cases, and combining different type fire sources in one flue is a definite no-no - cannot combine gas with coal or wood fired sources, for instance.

Answered 3 years ago by LCD

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