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The opponent
you can’t see.
A natural gas leak has no color, and asleep you may not notice the smell. Smoke and CO alarms aren’t built for a natural gas leak. If your furnace, water heater or stove runs on natural gas, this alarm stays on duty all night.
WIN subscriber price
Regular price $199 WIN subscriber price $139
Through December 31, 2026
TruWatch Natural Gas Alarm
Intertek (ETL) listed · conforms to UL 1484 · 5-year limited warranty
For homes with natural gas. It does not detect propane or carbon monoxide.
- 10-year sealed battery
- 85 dB alarm
- Intertek (ETL) listed to UL 1484
- No cords, no outlet
10 years, one sealed battery.
No plug, no wires, nothing to replace. It keeps working through a power outage.
Mounts high, where gas goes.
Natural gas rises, so it mounts within 12 inches of the ceiling, where a leak shows up first.
Early, loud warning.
It sounds before gas reaches 10% of the level where it can ignite: 85 dB at 10 feet.
70%
of Midwest homes heat with natural gas. Is yours one of them?
Source: U.S. Energy Information Administration, Residential Energy Consumption Survey (2020).
Watch
See it in 30 seconds.
30 seconds, with sound. The video loads when you press play (9 MB).
How it works
Three lights. One button. Nothing to set up.
The sensor checks the air for methane, the main part of natural gas. It sounds before gas reaches 10% of the level where it can ignite.
- Green, power. Flashes when you press Test to confirm the alarm is on.
- Red, gas. Flashes with a loud alarm when natural gas is detected.
- Yellow, trouble. Warns of a fault, a low battery, or end of life after 10 years.
Checking it? One press.
Where it goes
Natural gas rises. So the alarm goes up high.
Mount it with the included screws and anchors. No wiring and no outlet needed.
12 in
Within 12 inches of the ceiling.
3–10 ft
From a gas appliance, such as a furnace, water heater, dryer or fireplace.
5 ft
At least 5 feet from a cooking range or cooktop hood.
1+
In rooms with a gas appliance, near where people sleep, and one on every level you can.
Keep it away from bathrooms, vents, fans and open windows. Full placement rules are in the instruction manual that ships in the box.
In the box
What comes in the box.
| Detects | Natural gas (methane) only |
|---|---|
| Sensitivity | Alarms at 10% of the lower explosive limit |
| Alarm | 85 dB at 10 feet |
| Power | Built-in 3V lithium battery, 10 years |
| Listing | Intertek (ETL) listed, conforms to UL 1484, 6th edition |
| Size | 4.3 in tall × 3.5 in wide × 1.4 in deep (10.8 × 8.8 × 3.6 cm) |
| Mounting | Wall plate, screws and anchors included |
| Warranty | 5-year limited warranty |
| Model | PRONG |
WIN Magazine subscriber offer
Order at the WIN price.
WIN subscriber price $139 Regular price $199 Through December 31, 2026
Sold by TruServices Inc.
- 10-year sealed battery, no cords
- Intertek (ETL) listed, conforms to UL 1484
- Mounting kit included
- 5-year limited warranty
- Send your order request. No payment on this page.
- TruServices Inc. calls you to confirm your order and take payment.
- Your alarm ships to the address you give.
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No payment yet. TruServices Inc. will call you to confirm your order and take payment. Shipping and any sales tax are confirmed on that call.
Questions
How does ordering work?
Send the order request on this page. TruServices Inc., the seller, calls you at the number you give to confirm your order and take payment. Nothing is charged on this page, and there is no card form here.
Who gets the $139 price?
$139 is the WIN Magazine subscriber price, through December 31, 2026. The regular price is $199.
What about shipping and tax?
Shipping and any sales tax are confirmed when TruServices Inc. calls to take payment, before you pay.
Does it detect propane?
No. This model is built for natural gas (methane) only, the gas piped in from your utility. If your home uses propane from a tank, this is not the right alarm. Propane is heavier than air and sinks, so it needs its own alarm mounted low on the wall. Natural gas is lighter and rises, so TruWatch mounts high, within 12 inches of the ceiling.
Does it replace my smoke or carbon monoxide alarm?
No. It detects natural gas only. It does not detect smoke, fire, heat or carbon monoxide. Keep those alarms too.
Why not one combo alarm?
Each gas needs its own alarm. Natural gas is lighter than air and rises, so TruWatch mounts high, within 12 inches of the ceiling, where a leak shows up first. Propane is heavier and sinks toward the floor. CO mixes with room air; mount it where its own manual says. One combo unit can only hang at one height, so it can’t sit in the best spot for all three. Separate alarms, each mounted where its gas collects, give the earliest warning.
What does LEL mean?
Lower explosive limit: the smallest amount of gas in the air that can catch fire. For natural gas that’s roughly 5% of the air. This alarm sounds at 10% of that level, about half of one percent, so you hear it while a leak is still a call to your gas company.
How long does the battery last?
About 10 years from when you activate it. The battery is sealed, so there’s nothing to change. When the yellow light flashes three times every 60 seconds with three beeps, it’s time to replace the whole unit.
How many do I need?
At least one on every level of your home that has a gas appliance, mounted near the appliance and where you can hear it from the bedrooms. Larger homes often want one near each gas appliance.
Is it hard to install?
No. Drill one hole, set the anchor, screw on the back plate and slide the alarm on. Then press Test. You need a drill and a screwdriver; no wiring, no outlet, no app.
If the alarm sounds
- Get everyone out of the house. Leave the door open behind you.
- Don’t flip light switches, use phones, or start anything that could spark.
- From outside, call 911 or your gas company.
- Don’t go back in until the leak is found and fixed.