Carbon Monoxide and Your Gas Water Heater in Star, ID
If a carbon monoxide alarm is sounding or anyone in the house feels dizzy, sick, or confused, get everyone outside into fresh air and call 911 or your gas utility from outside. Do that before you call a plumber. Do not stop to open windows, find the cause, or turn the heater off.
A gas water heater burns fuel and must vent the exhaust out of the house. When the venting fails, carbon monoxide (CO) can spill into the room. You cannot see or smell it, so a working CO alarm is the detection tool. A plumber does not replace one, but our plumbers can inspect the heater and its vent once the scene is safe.
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Your first move if you suspect carbon monoxide
Carbon monoxide poisoning can come on fast, and the symptoms look like the flu: headache, dizziness, nausea, tiredness, and confusion. People who are asleep may never notice. Treat any alarm, or any of these symptoms across several people or pets at once, as real until proven otherwise.
Do these in order
- Get every person and pet outside into fresh air right away.
- Call 911 or your gas utility from outside. The utility number is on your gas bill.
- Stay out until responders tell you the home is clear. Do not go back in for belongings.
- If anyone has symptoms, say so on the call and tell responders. Medical care comes before any repair.
- Call a plumber only after the home is cleared. We cannot give a response time for gas calls, and we will not ask you to stay inside.
A gas smell is a separate problem with the same rule. Leave first, call from outside, and do not flip light switches or use a phone inside the house.
How a gas water heater ends up leaking exhaust
A gas water heater pulls in air, burns gas at the burner, and sends hot exhaust up a flue or out a vent pipe. The exhaust has CO in it. Normally it rises and leaves the house. Trouble starts when something blocks that path or starves the burner of air.
| Cause | What it looks like | Who handles it |
|---|---|---|
| Blocked or disconnected vent pipe | Soot streaks, a loose joint, a bird nest or debris in the flue | Call a plumber after the home is cleared |
| Not enough air in the utility room | Heater closet packed with boxes or sealed in tight | Clear the space once responders say it is safe |
| Backdrafting | Exhaust spills out at the draft hood instead of rising | Needs a trained inspection, not a guess |
| Dirty or poorly adjusted burner | Yellow or orange flame instead of mostly blue, soot on the tank | Gas utility or a licensed plumber |
| Cracked heat exchanger or flue damage | Rust flakes, scorch marks, a pilot that keeps going out | Often means replacement |
Several of these are made worse by tight, well-sealed homes and by exhaust fans that pull air away from the heater. If you have noticed a pilot light that keeps blowing out, take that as a warning sign. Do not just relight it again and again.
Signs you can see before an alarm ever sounds
- Soot or brown scorch marks around the top of the heater or on the draft hood
- A burner flame that is mostly yellow or orange, or that lifts and flickers
- Rust streaks on the vent pipe or flakes of rust inside the burner area
- Condensation or water stains near the flue joints
- A pilot light that goes out on its own more than once
- A stuffy, stale smell in the utility closet when the heater runs
None of these proves CO is in the house, and the absence of them proves nothing either. They tell you the heater deserves a look. If you see one, turn the gas control to pilot or off if you can reach it safely, and call our line to book an inspection. If you feel unwell, skip the call and go outside first.
After emergency crews say it is safe, call (208) 679-8357. We are open 24/7 and can inspect the heater and its vent.
Alarms: the only real way to know
Your senses cannot detect CO. A CO alarm can, and it works around the clock while you sleep. A plumber's visit is a point-in-time inspection of a heater and its vent. It does not tell you what the air is doing next Tuesday night.
Put alarms where you sleep
Place one near the bedrooms and follow the maker's instructions for height and distance from fuel-burning appliances.
Add one on each level
A house with a gas heater in the garage or basement should have an alarm on that floor and on the floor above.
Test monthly
Press the test button on the schedule the manual gives and replace batteries as directed.
Watch the end-of-life date
Alarms wear out. Check the date printed on the back and replace the unit when it says to.
What happens after the all-clear
Once responders say the house is safe, the heater may have been shut off at the gas valve. Leave it off until it has been inspected. A plumber can then look at the burner, the flue, the draft hood, the vent connections, and the air supply to the room.
If the vent is loose or blocked, the fix can be a quick reconnection or a reroute. If the tank is rusted through at the flue or the heat exchanger is damaged, repair is not sensible and water heater replacement is the safer answer. Our plumbers can talk you through water heater repair options when the heater is sound and the vent is the problem.
Permits and inspections on a replacement
Idaho's Division of Occupational and Professional Licenses (DOPL) says a permit is required when plumbing work is performed, and required inspections include a final. Star City Hall at 10769 W State Street lists building and plumbing permits on its services page, and the number is (208) 286-7247.
For you, that means a replacement gas heater should be a permitted job with an inspection at the end. Ask whoever installs yours how the permit and inspection will be handled, and ask your city building department if a local permit applies as well.
Source type: Idaho DOPL permit rules and the City of Star services page
Homeowners in Middleton and Eagle have their own city building departments. See our pages for Middleton and Eagle if you live there, and call your city for local permit questions. Venting and combustion air for a gas water heater are governed by code, and Idaho adopts the 2015 Uniform Plumbing Code (UPC) as its State Plumbing Code, which is one more reason to leave gas appliance work to a licensed professional.
Carbon monoxide questions from Star homeowners
Call 911 or your gas utility first, from outside the home. Leave the building before you pick up a phone for anything else. Call us after responders have cleared the house and you want the water heater and vent inspected.
A plumber can inspect the heater, flue, and vent for the conditions that cause CO. A plumber does not replace a CO alarm, which is the detection tool. Put alarms near sleeping areas and test them.
A mostly blue flame is normal. A yellow or orange flame can mean poor combustion or a dirty burner. It is a reason to have the heater checked soon, and a reason to confirm your CO alarms work.
Any gas appliance can if it is not vented and supplied with air correctly. Our tankless water heater page explains the vent requirements to ask about before you buy.
No verified rule says so. The district handles sewer and water service, not appliances in your home. For permit or inspection questions on a replacement, call Star City Hall at (208) 286-7247 or DOPL.
For a gas smell or a sounding CO alarm, leave and call 911 or your gas utility from outside. For the heater itself afterward, call us at (208) 679-8357. For permit questions on a replacement, call Star City Hall at (208) 286-7247.
Need the heater checked after an alarm?
Call our 24/7 line once everyone is safe and the responders have cleared the home. A plumber will explain what the visit covers.
☎ Call (208) 679-8357