Health & Wellness · Head-to-head
DeNova Detect Natural Gas Alarm ML-310ES vs Nexelec VIGAS Natural Gas Alarm K987GL
Which should you buy? Our verdict on both, pulled from our full The Best Combustible Gas Detectors: 4 Compared (and One to Skip) comparison.
The DeNova wins on the two things you cannot retrofit: it is marked at the lower 10 percent LEL threshold, and it says the words please replace detector when the sensor is done rather than leaving you to decode a chirp. The Nexelec matches the threshold and adds four more years of service life, which is the trade worth making if nobody in the house will remember a replacement date.
DeNova Detect Natural Gas Alarm ML-310ES
Buy itA battery powered fixed methane alarm conforming to UL 1484 at a 10 percent LEL threshold, with spoken end of life and alarm announcements in English and Spanish.
- DeNova publishes a 10 percent LEL alarm threshold, which is half the 25 percent maximum NFPA 715 still allows a listed alarm to use.
- The end of life warning is spoken, not just chirped: the yellow trouble LED blinks twice every ten seconds, the unit beeps every 60 seconds, and it says please replace detector once an hour.
- It runs on its own battery with no outlet and no wiring, so you can put it where the standard wants it rather than where an outlet happens to be.
- Six year product life, backed by a five year warranty, so it is a shorter replacement cycle than the ten year sealed alarms in this category.
- Natural gas only. DeNova states it does not detect smoke, fire or carbon monoxide, and it is not an LP alarm.
- DeNova does not publish a test procedure using real gas, so the test button confirms the electronics and sounder rather than the sensor.
Nexelec VIGAS Natural Gas Alarm K987GL
Buy itThe same 10 percent LEL methane threshold in a sealed ten year package, aimed at buyers who want one install and no maintenance calendar.
- Ten year designed service life on a sealed lithium battery, with no outlet, wiring or battery changes.
- Nexelec publishes a 10 percent LEL alarm threshold for methane and an ETL listing by Intertek to UL 1484.
- An 85 dB alarm at 10 feet and LED indicators for normal, alert, fault and maintenance states, per Nexelec.
- Methane only. Nexelec is explicit that it does not detect propane, carbon monoxide or smoke.
- Covered by a 2-year limited warranty, and Nexelec states the 10 year service life is not a 10 year warranty.
- Sealed construction means the whole alarm is disposable at end of life, with nothing serviceable inside.
Side by side
The 8 criteria below are the ones our full comparison judged every product on, narrowed to these two.
| DeNova Detect Natural Gas Alarm ML-310ES Our pick | Nexelec VIGAS Natural Gas Alarm K987GL | |
|---|---|---|
| Our verdict | Buy | Buy |
| Best for | A natural gas household that wants the lower alarm threshold and an end of life warning nobody can misread as a low battery chirp. | Someone who wants the lower threshold fitted once and forgotten for a decade, in a rental or a second home nobody maintains closely. |
| Price tier | $$ · mid-range | $$ · mid-range |
| Type | Fixed alarm, battery powered | Fixed alarm, sealed battery |
| Gases covered | Natural gas (methane) only | Natural gas (methane) only |
| Alarm threshold | 10 percent LEL | 10 percent LEL |
| What it reports | Alarm state only | Alarm state only |
| Sensor | MEMS | MEMS semiconductor |
| Published life | 6 year product life | 10 year service life |
| End of life signal | Yellow LED plus spoken please replace detector | End of life warning sounds, pattern not described on the page |
| Power | Battery, no wiring | Sealed lithium, no wiring |
Which one is right for you?
Pick the DeNova Detect Natural Gas Alarm ML-310ES if
a natural gas household that wants the lower alarm threshold and an end of life warning nobody can misread as a low battery chirp.
Know before buying: six year product life, backed by a five year warranty, so it is a shorter replacement cycle than the ten year sealed alarms in this category.
Pick the Nexelec VIGAS Natural Gas Alarm K987GL if
someone who wants the lower threshold fitted once and forgotten for a decade, in a rental or a second home nobody maintains closely.
Know before buying: methane only. Nexelec is explicit that it does not detect propane, carbon monoxide or smoke.
The bottom line
Our overall pick is the DeNova Detect Natural Gas Alarm ML-310ES - A battery powered fixed methane alarm conforming to UL 1484 at a 10 percent LEL threshold, with spoken end of life and alarm announcements in English and Spanish. Choose the Nexelec VIGAS Natural Gas Alarm K987GL instead if someone who wants the lower threshold fitted once and forgotten for a decade, in a rental or a second home nobody maintains closely.
Want the full picture, including the other options we compared and the popular one we'd skip? Read the complete The Best Combustible Gas Detectors: 4 Compared (and One to Skip).