This is a tricky situation where you have conflicting advice! Here's a breakdown of what's going on and how to approach it

Why the Conflict?
Manufacturer's Recommendation (15 feet)

Gas appliances can produce small amounts of CO during normal operation, even when functioning correctly. Placing the CO alarm too close can lead to nuisance alarms (false alarms). The manufacturer is likely trying to minimize these occurrences to ensure people take the alarm seriously. Also, some appliances, if not properly sealed or maintained, can emit higher levels of CO sporadically. The distance helps avoid detection of these small, short-term spikes that might not represent a true danger.

Inspector's Requirement (10 feet)

Inspectors are primarily concerned with life safety. They want to ensure that a CO alarm detects a dangerous leak as quickly as possible to give occupants time to escape. They likely believe that closer proximity is more critical than avoiding nuisance alarms. Building codes generally specify a maximum distance from potential CO sources.

Which to Follow? The Inspector Generally Has Authority

In almost all cases, you must follow the inspector's requirements to pass inspection and obtain necessary permits for your home. Their job is to ensure the installation meets local safety codes.

What to Do


Politely and Respectfully Discuss with the Inspector

Explain that the manufacturer recommends 15 feet to prevent nuisance alarms. Ask why they require it within 10 feet. Is it a specific local code requirement? Do they have experience with gas appliances in your area? Is there any written code that dictates the exact distance. Ask to see it or ask for a link to review it.2.

If the Inspector is Firm

You will likely need to comply with their requirement to pass inspection. However:

Document Everything

Keep a record of the conversation, the inspector's name, and any specific code references they provide. This documentation is important if you experience frequent false alarms later.3.

Consider a Dual Approach (If Possible)



Primary Detector (Compliant)

Install a CO/smoke detector within the 10-foot requirement for inspection purposes.

Secondary Detector (Manufacturer Recommended)

In addition, install a second CO/smoke detector approximately 15 feet (or more, depending on room size) away from the appliance. This gives you the advantage of both early detection (from the inspector-required unit) and reduced false alarm potential (from the manufacturer-recommended unit). The secondary detector is a safety precaution and does not need to be specifically approved by the inspector.4.

Invest in a High-Quality CO/Smoke Detector

Look for models with a longer lifespan and better sensitivity. Some newer detectors have advanced sensors and algorithms designed to reduce false alarms.5.

Regular Maintenance

Ensure your gas appliances are professionally inspected and maintained annually. This minimizes the chances of CO leaks and reduces the risk of false alarms. Test your CO/smoke detectors monthly to ensure they are functioning correctly. Replace CO/smoke detectors according to the manufacturer's recommendations (usually every 5-10 years).

Important Considerations



Local Codes

Building codes vary by location. What's required in one city might be different in another. The inspector is applying local codes.*

Room Layout

The size and layout of your basement might influence the ideal placement of the CO/smoke detector. A large, open basement might allow for greater distance while still providing adequate coverage.

Ultimately, prioritize life safety and compliance with local codes. Open communication with the inspector is key to finding a solution that addresses both safety concerns and potential nuisance alarms. Flag for review