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 listed 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 listed 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 validated by Intertek, which is half the 25 percent maximum NFPA 715 still allows a listed alarm to use.
- The end of life warning is spoken, not chirped: the yellow trouble LED blinks twice every ten seconds and the unit says please replace detector once a minute.
- 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.
- The product page prints the actual placement rule rather than leaving it to the manual: no more than 12 inches from the ceiling on a wall, at least 3 feet and no more than 10 feet horizontally from the appliance.
- Methane only. Nexelec is explicit that it does not detect propane, carbon monoxide or smoke.
- Nexelec advises against testing by introducing gas near the device, so you are trusting the self test and the listing for the life of the unit.
- Sealed construction means the whole alarm is disposable at end of life, with nothing serviceable inside.
Side by side
| DeNova Detect Natural Gas Alarm ML-310ES | 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 |
The bottom line
Our overall pick is the DeNova Detect Natural Gas Alarm ML-310ES - A battery powered fixed methane alarm listed 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).