Here's What You Need to Know

LL157 is a New York City ordinance that now requires natural gas alarms be installed in every room a gas appliance exists by May 1, 2025

Alarms must be labeled to meet the UL1484 Standard

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Private dwellings: Permanent dwellings/apartments/homes

Class A multiple dwellings: One and two-family houses

Class B multiple dwellings: Transient housing-hotels, lodging houses, dorms, etc.

Alarms Must Comply with NFPA715 Installation

  • Placement should be on or within 12 inches from the ceiling
  • Alarms should be horizontally placed 3-10 feet from the gas appliance
  • Alarms should be 5-10ft. horizontally from gas stoves

DeNova Detect Gas Alarms Help Save Lives!

  • 10-year 100% battery-operated alarm (never replace batteries)
  • Alerts 11 minutes faster
  • No false alarms (tested by Gas Technology Institute)

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In The News

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New York Con Edison Natural Gas Alarm Deployment Enhances Safety

New York Con Edison Natural Gas Alarm Deployment Enhances Safety

After a series of deadly natural gas explosions, New York City needed a standardized natural gas alarm system to increase public safety. Nearly 233,000 natural gas detectors were incorporated into...

Gas Leak Safety Resources

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Installation Instructions

*Never test your alarm by intentionally exposing to Natural Gas

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Contact Us For Smarter Gas Leak Safety

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About DeNova Detect

Since 1964, New Cosmos Electric Continues To Be The World-Leader In Residential Gas Explosion Prevention.


For over 60 years, we have been protecting people and property with innovative gas safety products. Our products create safe and secure spaces with the most advanced sensor technology possible. We adhere to the highest safety standards while offering the best value to our customers.


Our desire to design safe and comfortable environments always has and always will be at the core of who we are and what we do. We are currently the leading supplier of residential methane detectors in the global market with sales of over 70 million gas alarms.


We have developed and perfected a wide variety of products featuring our world-class gas sensor technology that include residential and industrial gas alarms, portable gas detectors, and odor sensors.

Established in 1960 and headquartered in Osaka, Japan, New Cosmos Electric has revolutionized the natural gas industry by providing reliable solutions and unmatched innovation. New Cosmos Electric is the global leader in gas sensor production and development. Our innovative product line and six decade history of success is a reflection of our commitment to our customers to always remain one step ahead.

New Cosmos Electric is the world leader in gas sensor production capacity and development. Our Micro-Electro Mechanical Systems (MEMS) technology has been implemented in gas sensors for a proven and substantial reduction in size and power consumption, allowing for the successful development of battery-powered Natural Gas Alarms.

We offer one of the earliest natural gas detection available in the US market (10% LEL) and our products significantly improve safety in residential and commercial settings. Our unique hot-wire semiconductor sensors offer high sensitivity for best-in-class gas detection. We strive to continually provide the highest value in life-saving technology by continuously optimizing our gas sensor technology.

New Cosmos Electric formed a wholly owned subsidiary - New Cosmos USA, INC. in 2018. New Cosmos USA is headquartered in Chicago and has developed the DeNova Detect brand to provide gas alarms to some of the largest utility companies in the U.S. today. Our global team remains committed to deliver cutting-edge safety solutions to our customers in order to detect and protect what matters most.