Boise HVAC 101: What to Do If You Smell Gas from Water Heater
Smelling gas near your water heater is not something to shrug off or troubleshoot on your own. It’s one of the most serious situations a homeowner can face — and the actions you take in the first few minutes matter a great deal.
At Gem Heating & Air Conditioning, we’ve been responding to calls like this across Boise and the Treasure Valley since 2006. We want every homeowner to know exactly what to do — and just as importantly, what not to do — if they ever find themselves in this situation.
Step 1: Don’t Panic, But Act Immediately
A gas smell near your water heater is urgent, but staying calm is essential. Panicked decisions — like flipping light switches, grabbing your phone off a charger, or running through the house — can introduce ignition risks. Move deliberately and follow these steps in order.
Step 2: Do Not Touch Any Switches or Electronics
This is critical. Do not flip any light switches, unplug anything, use your phone, or operate any electrical device inside the home. Even a small electrical spark can ignite accumulated natural gas. Leave everything exactly as it is and focus solely on getting people and pets out of the house.
Step 3: Get Everyone Out of the Home Immediately
Don’t stop to grab belongings. Don’t go back for your phone charger or your laptop. Get every person and every pet out of the house as quickly and calmly as possible. Leave the front door open as you exit to help ventilate the space — but don’t take time to open windows throughout the house.
Step 4: Do Not Use Your Phone Until You’re Outside
Once you are safely outside and a comfortable distance away from the home, then use your phone. Do not make calls or send texts while still inside — a ringing or transmitting phone can produce a small spark in rare cases, and it’s simply not worth the risk.
Step 5: Call 911 and Your Gas Utility Company
From a safe distance — ideally from a neighbor’s home or from the street well away from your house — call 911 first. Then call your gas utility provider:
- Intermountain Gas Company (serving most of the Treasure Valley): 1-800-GAS-LEAK (1-800-427-5325)
Do not re-enter the home for any reason until emergency responders have arrived, inspected the property, and declared it safe.
Step 6: Do Not Try to Find the Leak Yourself
We know it’s tempting. You want to know if it’s something small — a loose connection, a pilot light issue — before calling in the cavalry. Please resist that instinct. Natural gas is odorless in its pure form; the rotten egg smell you’re detecting comes from a chemical called mercaptan that utility companies add specifically so leaks can be detected. If you can smell it, there’s enough gas present to pose a real danger. Leave the investigation to trained professionals.
What Causes a Gas Smell Near a Water Heater?
Once the situation has been handled by emergency responders and your home is declared safe, you’ll want to understand what happened. Here are the most common causes of a gas smell near a water heater:
Pilot light issues — On older water heaters with a standing pilot light, the pilot can go out and allow a small amount of unburned gas to accumulate before the thermocouple shuts off the gas supply. This is one of the more common and less severe causes, but it still requires professional attention before relighting.
A loose or deteriorating gas line connection — The fittings connecting your gas supply line to the water heater can loosen over time or develop small cracks, especially as materials age and expand and contract through seasonal temperature changes.
A faulty gas valve — The gas control valve on your water heater regulates gas flow to the burner. If it begins to fail, it can allow small amounts of gas to escape even when the unit is not actively heating water.
Sediment buildup causing improper combustion — Heavy sediment buildup at the bottom of the tank can interfere with the burner’s ability to combust gas cleanly, sometimes producing unusual smells that homeowners mistake for a gas leak. This is less dangerous than an actual leak but still signals that the water heater needs service.
An aging or failing unit — Water heaters have a typical lifespan of 8 to 12 years. As units age, components wear out and the likelihood of a gas-related issue increases significantly.
When Can You Re-Enter the Home?
Only after emergency responders — firefighters, your gas utility’s emergency crew, or both — have inspected the home, identified the source of the leak, and given you the all-clear. Do not let anyone pressure you to re-enter early, and do not assume it’s safe just because the smell seems to have dissipated.
What Happens After the Leak Is Addressed?
Once the immediate danger is resolved, your gas utility will likely shut off gas service to your home until a licensed professional repairs or replaces the faulty component. That’s where we come in.
At Gem Heating & Air Conditioning of Boise, Idaho, our licensed technicians are trained to diagnose and repair gas water heater issues safely and thoroughly. Whether the fix is a simple connection repair, a gas valve replacement, or a full water heater replacement, we’ll walk you through exactly what we found and what your options are — with honest pricing and no pressure.
We serve Boise, Meridian, Nampa, Caldwell, Eagle, Kuna, and communities throughout the Treasure Valley, and we offer 24/7 emergency service for situations exactly like this.
Carbon Monoxide Useful Facts
While you’re thinking about your water heater’s safety, it’s worth mentioning carbon monoxide. A water heater that isn’t combusting gas properly can produce CO — a colorless, odorless gas that’s extremely dangerous. Unlike a natural gas leak, you won’t smell it coming.
If you don’t already have carbon monoxide detectors installed near your water heater and sleeping areas, make that a priority. It’s one of the simplest and most important things you can do to protect your family.
If you smell gas near your water heater:
- Don’t touch any switches or electronics
- Get everyone out of the home immediately
- Call 911 and Intermountain Gas from outside
- Do not re-enter until professionals clear the home
- Call a licensed HVAC professional to repair or replace the unit
Your safety and your family’s safety always come first. Equipment can be repaired or replaced. Don’t take chances.
If you need water heater repair or replacement service anywhere in the Treasure Valley, call or text Gem Heating & Air Conditioning at 208-912-6304. We’re here seven days a week, with 24/7 emergency availability.
