Safe-T-Alert Combo CO/Propane Alarm - Surface Mount Mini Black
Safe-T-Alert Combo CO/Propane Alarm - Surface Mount Mini Black — Product description
The Safe-T-Alert Combo Carbon Monoxide / Propane Alarm (MPN 25-742-BL) is the mini surface-mount dual-gas alarm in black - one alarm that detects both LP (propane) gas leaks AND carbon monoxide simultaneously, eliminating the need for separate CO and propane detectors on the same wall. Built for the rugged RV / boat environment with vibration, shock, humidity, and extreme temperature tolerance designed in. 12V DC hardwire power with no batteries to replace or fail unexpectedly. LED indicator plus beeping alert when dangerous gas levels are detected. Alarm Mute button silences the alert while the space is ventilated. rapid-recovery sensor resets when silenced or re-activates the alarm if dangerous gas levels still remain. Compact mini form factor ideal for Class A motorhomes, Class B van campers, Class C mini-motorhomes, travel trailers, fifth wheels, truck campers, folding campers, and small marine cabins where space is limited. Meets RVIA and NFPA requirements. Listed to UL 1484 RV (propane) and UL 2034 RV (carbon monoxide). 1-year limited warranty. Replace every 5 years per industry standard for combustible-gas detector lifespan.
The Safe-T-Alert 25-742-BL is the mini surface-mount combo carbon monoxide / propane alarm in black - the right choice for RV and small-marine-cabin owners who want both CO and LP gas detection in a single wall-mounted unit instead of running separate detectors. Safe-T-Alert (the RV alarm brand of MTI Industries) is one of the major US RV safety equipment manufacturers. their alarms are factory-spec on many recreational vehicle brands and have built a reputation for reliable operation in the harsh RV environment over years of use.
Why a combo alarm. CO and LP gas are both serious safety hazards in any space with combustion-burning appliances (RV refrigerators, water heaters, furnaces, stoves, generators) or where LP gas is stored or used. Carbon monoxide is colorless, odorless, and lethal - kills sleeping occupants without warning if a combustion appliance malfunctions or exhausts indoors. LP gas is heavier than air and pools in low areas. a leak in a closed cabin can reach explosive concentrations within minutes. Both hazards require active electronic detection - human senses can't reliably detect either threat. The combo alarm gives you both detection functions in one unit on one wall location, simplifying the install while providing the dual coverage that RV / boat safety actually requires.
Built for the rugged RV environment. The 25-742-BL is engineered specifically for the RV use case - sustained vibration from road travel, shock from rough roads and bumps, humidity from condensation and weather exposure, and extreme temperature variations from cold winter storage to hot summer dock days. Standard residential CO / LP alarms often fail in the RV environment because they're not built for the conditions. the Safe-T-Alert is built for them and lasts the full 5-year service life that combustible-gas detectors are rated for.
12V DC hardwire power - no batteries. The alarm is hardwired to the RV / boat 12V DC system rather than running on disposable batteries. Why this matters: residential CO detectors run on 9V batteries that need replacement every 6-12 months. RV owners frequently forget to replace them, and the alarm dies silently. The hardwired Safe-T-Alert eliminates that failure mode - as long as the 12V house battery is alive, the alarm is alive. No batteries to fail, no batteries to replace, no batteries to forget. Current draw is minimal so the alarm doesn't meaningfully impact battery life when the RV is in storage with the house battery connected.
LED indicator plus beeping alert. The alarm uses a multi-color LED indicator on the front panel for status (typically green for normal operation, yellow for low-power or fault conditions, red for active alarm) plus a piercing audible beeping alert when dangerous gas levels are detected. The dual-mode signaling means you get both visual confirmation that the alarm is running normally AND an unmistakable audible alert when something's wrong. The audible alert is loud enough to wake sleeping occupants - the entire purpose of a combustible-gas alarm.
Alarm Mute button with rapid-recovery sensor. When the alarm sounds, you press the Mute button to silence the audible alert while you ventilate the space (open windows, turn off the offending appliance, address the gas leak source). The alarm doesn't reset to normal operation immediately - it stays in 'silenced' mode while the rapid-recovery sensor monitors gas levels. If gas levels return to safe within the recovery window, the alarm resets to normal operation. If gas levels remain dangerous after the silenced period, the alarm re-activates automatically - so you can't accidentally mute yourself into a false sense of safety while the actual gas hazard continues. The Mute-with-recovery design is the right behavior for these alarms.
Compact mini form factor. The mini configuration takes minimal wall space - the right choice for tight RV / small-boat installations where every square inch of wall surface is valuable. Compare to full-size combo alarms that take 4+ inches of wall width. the mini fits in tighter locations on cabin walls, near galleys, near sleeping areas, or wherever the right detection location is on the specific RV / boat layout.
Black color for modern RV interiors. The 25-742-BL is the black-finish variant - matches well with the dark trim packages typical of newer RV interiors. Safe-T-Alert offers the same alarm in white (different part number) for owners with white interior trim. The functional capability is identical between the color variants. choose based on what matches your interior aesthetic.
Surface mount installation. The 25-742-BL surface-mount design installs flush against a wall with the body of the alarm sitting proud of the wall surface. Mounting requires only a flat wall section with 12V wiring access behind it - no need to cut a recessed pocket into the wall the way some flush-mount alarms require. Standard install uses two screws into the wall (usually with anchors if mounting in thin RV wall material), the wires from the 12V house circuit, and the connector between the alarm and wiring. Total install runs 30-60 minutes for someone with reasonable mechanical and electrical skills.
Ideal for: Class A motorhomes, Class B van campers, Class C mini-motorhomes, travel trailers, fifth wheels, truck campers, folding campers. Safe-T-Alert specifically lists these RV types because the alarm's vibration / shock / humidity / temperature ratings match the conditions these vehicles see in normal use. The same characteristics that make it right for RVs make it right for small-boat cabin installations on boats with similar size constraints and similar environmental conditions.
Meets RVIA and NFPA requirements. RVIA (Recreation Vehicle Industry Association) and NFPA (National Fire Protection Association) both publish standards for CO and LP gas detection in recreational vehicles. The 25-742-BL meets both standards' requirements - meaning if you're building or upgrading an RV that needs to comply with the relevant codes (insurance, registration, sale at auction), this alarm satisfies the regulatory requirements.
Listed to UL 1484 RV and UL 2034 RV. UL 1484 RV is the standard specifically for propane alarms in recreational vehicles. UL 2034 RV is the standard specifically for carbon monoxide alarms in recreational vehicles. The 25-742-BL is listed to BOTH standards because it's a combo alarm that detects both gases. UL listing is the rigorous third-party certification that the alarm performs as specified - meaningful confidence signal that the alarm will actually detect dangerous gas levels and alert occupants in time to take action.
5-year service life. CO and LP gas sensors degrade chemically over time regardless of whether they've been triggered. Industry standard is to replace combustible-gas alarms every 5 years - by that point, the sensor sensitivity has degraded enough that the alarm may not reliably detect dangerous gas levels. The 25-742-BL has a date stamp on the back showing manufacture date - replace 5 years after that date. Safe-T-Alert's broader product line gives you replacement options when this alarm reaches end-of-life.
1-year limited warranty. Safe-T-Alert backs the 25-742-BL with a 1-year warranty against manufacturing defects. Reasonable warranty term for a safety device at this price point - the warranty covers infant-mortality failures (early defects) without the longer-warranty premium price of higher-tier alarms. The 5-year service life is the limiting factor on the alarm's useful lifespan, not warranty term.
Test and inspect weekly. Safe-T-Alert recommends testing each alarm weekly during use - press the test button on the front panel and verify the alarm sounds. Replace any alarm that fails the test or shows other malfunction signs. The weekly test takes 30 seconds and verifies that the alarm system is functional - critical to actually catching a sensor failure or wiring issue before it becomes a safety problem.
Key Features
- Safe-T-Alert Combo Carbon Monoxide / Propane Alarm - mini surface mount black
- Detects both LP (propane) gas leaks AND carbon monoxide simultaneously - one alarm, two functions
- 12V DC hardwire power - no batteries to replace or fail
- LED indicator plus piercing audible beeping alert
- Alarm Mute button silences alert while space is ventilated
- Rapid-recovery sensor re-activates alarm if dangerous gas levels remain after mute
- Built for rugged RV environment - vibration, shock, humidity, extreme temperatures
- Compact mini form factor for tight RV / small-boat installations
- Black color for modern RV / boat interiors (white version also available)
- Surface mount install (no wall cut-out needed)
- Ideal for Class A / B / C motorhomes, travel trailers, fifth wheels, truck campers, folding campers, small marine cabins
- Meets RVIA and NFPA requirements for RV combustible-gas detection
- Listed to UL 1484 RV (propane) and UL 2034 RV (carbon monoxide)
- 5-year service life per industry standard for combustible-gas detector lifespan
- Test weekly per manufacturer recommendation
- 1-year limited warranty
- Manufacturer Part Number 25-742-BL / UPC 715456257440
Why Buy from NVN Marine
- Authorized Safe-T-Alert reseller, full manufacturer warranty
- NMEA member and ABYC certified, advice from real boat techs
- Same-day shipping before 3 PM ET on in-stock items
- NY headquarters and Fort Lauderdale flagship retail store
Technical specifications
| Title | Safe-T-Alert Combo Carbon Monoxide / Propane Alarm - Surface Mount Mini, Black |
|---|---|
| Brand | Safe-T-Alert (MTI Industries) |
| Manufacturer Part Number | 25-742-BL |
| UPC | 715456257440 |
| Type | Combo carbon monoxide + propane (LP) gas alarm |
| Form Factor | Mini surface mount |
| Color | Black |
| Power Source | 12V DC hardwire (no batteries) |
| Detection - LP Gas | Yes (propane gas) |
| Detection - Carbon Monoxide | Yes |
| Indicator Type | Multi-color LED plus audible beeping alert |
| Mute Function | Yes - with rapid-recovery re-activation if gas remains |
| Mounting | Surface mount (no wall cutout needed) |
| Environmental | Built for vibration, shock, humidity, extreme temperatures |
| Standards Compliance | RVIA, NFPA |
| UL Listings | UL 1484 RV (propane), UL 2034 RV (carbon monoxide) |
| Recommended For | Class A / B / C motorhomes, travel trailers, fifth wheels, truck campers, folding campers, small marine cabins |
| Service Life | 5 years per industry standard |
| Recommended Test Frequency | Weekly during use |
| Replacement | Replace 5 years after manufacture date stamped on alarm |
| Warranty | 1 year limited |
Frequently asked questions
Why detect both CO and propane?
Both are serious safety hazards in spaces with combustion-burning appliances or LP gas storage. Carbon monoxide is colorless, odorless, and lethal - kills sleeping occupants without warning if a combustion appliance malfunctions or exhausts indoors. LP gas is heavier than air and pools in low areas. a leak in a closed cabin can reach explosive concentrations within minutes. Human senses can't reliably detect either threat. The combo alarm gives you both detection functions in one unit on one wall location, simplifying install while providing the dual coverage that RV / boat safety actually requires.
Do I need batteries?
No - the alarm is 12V DC hardwired to the RV / boat house electrical system. No batteries to replace or fail. As long as the house battery is alive, the alarm is alive. The hardwired design eliminates the most common failure mode of residential CO detectors (forgotten battery replacement). Current draw is minimal so the alarm doesn't meaningfully impact house battery life during storage.
How does the Mute button work?
When the alarm sounds, press Mute to silence the audible alert while you ventilate the space (open windows, turn off the offending appliance, address the leak source). The alarm doesn't immediately reset to normal - it stays in silenced mode while the rapid-recovery sensor monitors gas levels. If gas levels return to safe, the alarm resets to normal operation. If gas levels remain dangerous, the alarm re-activates - so you can't accidentally mute yourself into a false sense of safety while the actual gas hazard continues.
How long does it last?
5-year service life per industry standard for combustible-gas alarms. CO and LP gas sensors degrade chemically over time regardless of whether they've been triggered. by 5 years post-manufacture, sensor sensitivity has degraded enough that reliable gas detection isn't guaranteed. Check the manufacture date on the back of the alarm and replace 5 years after that date. Safe-T-Alert's product line gives you replacement options at end-of-life.
Is it Coast Guard / RVIA approved?
Listed to UL 1484 RV (propane) and UL 2034 RV (carbon monoxide), and meets RVIA / NFPA requirements for recreational vehicle combustible-gas detection. For RV builds or upgrades that need code compliance (for insurance, registration, sale at auction), this alarm satisfies the regulatory requirements. For specific Coast Guard requirements on inspected commercial vessels, verify with your local Coast Guard district - regulations vary by vessel class.
Where should I install it?
Install per Safe-T-Alert's instructions - typically near sleeping areas (CO detection is most critical there) and near LP-gas-using appliances (galley stove, water heater, furnace). Mount on a wall surface with 12V wiring access behind, away from windows and ventilation outlets that would prevent accurate gas detection. Avoid mounting in or directly above galley appliances where cooking byproducts can cause false alarms. RV builders typically place these in the main living area on a vertical wall surface 5-6 feet above floor level.
Surface mount vs flush mount - what's the difference?
Surface mount sits proud of the wall surface (the alarm body extends out from the wall). Flush mount recesses into a wall cutout so the alarm face is flush with the wall surface. Surface mount installs are simpler - no wall cutout needed, just two screws and wiring access. Flush mount installs look cleaner but require cutting a recessed pocket into the wall. The 25-742-BL is the surface-mount mini variant. Safe-T-Alert sells flush-mount variants under different part numbers.
How do I install it?
Mount the alarm to the wall using two screws (with wall anchors if mounting in thin RV wall material). Connect the 12V power leads to the RV / boat 12V house circuit through the appropriate fuse (typically a 1A fuse on the alarm circuit). Verify the polarity is correct (red to positive, black to negative). Test the alarm using the test button to confirm operation. Total install runs 30-60 minutes for someone with reasonable mechanical and electrical skills.
What does the LED indicate?
Multi-color LED status indicator on the front panel - typically green for normal operation (alarm is functioning, no gas detected), yellow for low-power or fault conditions (alarm needs attention), red for active alarm (dangerous gas levels detected). Dual-mode signaling combines the visual LED with audible beeping when dangerous gas levels are detected. Check the LED weekly to verify normal operation status.
Should I test it regularly?
Yes - Safe-T-Alert recommends weekly testing during use. Press the test button on the front panel and verify the alarm sounds (loud beeping audible across the RV / cabin). Replace any alarm that fails the test or shows other malfunction signs. Weekly testing takes 30 seconds and verifies that the alarm system is functional - critical to actually catching a sensor failure or wiring issue before it becomes a safety problem.
What if it goes off?
Treat any alarm as a real emergency until proven otherwise. Immediately: get all occupants out of the RV / cabin, ventilate the space (open windows and doors), shut off LP gas at the tank if you can do so safely, do NOT operate any electrical switches that could spark in a gas-rich atmosphere, and don't return to the space until the alarm has reset and you've identified / fixed the source of the leak or CO production. Get professional service if you can't identify and fix the source yourself.
What's the warranty?
1-year limited warranty against manufacturing defects under normal recreational use. Service runs through Safe-T-Alert / MTI Industries warranty network. Save the receipt and original packaging if practical for warranty service. The 5-year service life is the limiting factor on alarm useful lifespan rather than warranty term.
