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Rick, Construction Supervisor
Category: Plumbing
Satisfied Customers: 21992
Experience:  Licensed Master plumber with 40+ yrs. experience.
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Situation: atmospheric water heater. very gh CO count when

Customer Question

situation: atmospheric water heater. very high CO count when measuring in throat with combustion tool. Is there anything that can be done to change the gas to air ratio or anything to reduce the CO other than replacing? Draft is good. Thanks.
Submitted: 1 year ago.
Category: Plumbing
Expert:  Rick replied 1 year ago.

There are no fuel/air adjustments on water heaters. The only thing that might help is more combustion air. If this is a unit with a sealed combustion chamber you can vacuum the air intake vent at the bottom of the heater. Some models have a screen around the base to keep lint and other debris out. If the unit is in a confined area there may not be adequate air for combustion in the space