Napoleon Astound SlimMount 42" Wall Mount Electric Fireplace
A 42" electric fireplace only 4" deep that hangs on the wall or recesses fully into it. The Napoleon Astound SlimMount NEFL42AS shows a flame with a spark effect through a 42-1/8" x 12-3/8" viewing area, in orange and yellow layers over a glass media bed lit in 13 colors, and its 5,000 BTU/hr (1,500 W) heater has a built-in thermostat — or switch the heat off and run the flame alone. It plugs into a dedicated 120 V outlet, with no vent and no gas line. from $969.
Choose it if you want a long, low flame on a wall without building a firebox: two people hang it on the supplied bracket, or you frame a 42-3/4" x 17-1/2" opening at least 4" deep and recess it flush. The included remote has a 7-day timer, and the Napoleon Home app and Google Home or Alexa run it from your phone or by voice.
It is not right for you if you want a deep, three-dimensional firebox. The SlimMount is only 4" deep, so it hangs nearly flush on the wall or recesses fully into it.
Specifications
The NEFL42AS measures 44-1/8" wide by 18" high by 4" deep, with a 42-1/8" x 12-3/8" viewing area. Wall mounted, leave at least 2" between its top and a mantel so it can be lifted off the bracket; recessed, a mantel may sit directly above it at 0". The recessed rough opening is 42-3/4" wide by 17-1/2" high and at least 4" deep in a non-load-bearing wall. Power is 120 VAC, 1,500 W maximum on a dedicated, grounded 15 A circuit, plugged in or hard-wired.
How the 42" compares to the other Astound SlimMount sizes
The Astound SlimMount comes in four widths that share the 18" height, 4" depth, 12-3/8" viewing height and 1,500 W heater: the 50" (NEFL50AS, from $1,149), the 62" (NEFL62AS, from $1,349) and the 74" (NEFL74AS, from $1,419), against from $969 for this 42". This one is 44-1/8" wide overall with a 42-1/8" wide viewing area, and recesses into a 42-3/4" wide opening.
Features
- Only 4" deep — hang it on the wall on the supplied bracket, or recess it fully into a 2" x 4" framed wall
- Orange and yellow flame layers with a spark effect, each set from 0% to 100% in 25% steps, with five flame speeds
- Ember bed and top light in 13 colors each, or an automatic color cycle
- 5,000 BTU/hr (1,500 W) heater with ECO half-heat and 30-minute BOOST modes and a built-in thermostat — or run the flame with no heat
- Premium remote with a 7-day timer, plus Wi-Fi control from the Napoleon Home app and Google Home or Alexa
- Plugs into a dedicated 120 V outlet or hard-wires — no vent and no gas line
Answers to common questions
Does it need a vent, a chimney or a gas line?
No. The Astound SlimMount is an electric fireplace and needs no venting — only power. Plug it into a grounded 120 V outlet on a dedicated 15 A circuit, or have an electrician hard-wire it; a recessed installation must be hard-wired. Extension cords and power strips are not allowed.
Can I recess it into the wall, or does it hang on the surface?
Both. It hangs on the supplied wall bracket, screwed into a stud where one is accessible, and two side cover panels finish its edges. To recess it, frame a 42-3/4" wide by 17-1/2" high opening at least 4" deep in a non-load-bearing wall — it fits a standard 2" x 4" framed wall. A one-piece trim is fitted at the factory, or remove it for a trimless finish.
How much heat does it put out, and can I run it without heat?
The heater is 1,500 W, about 5,000 BTU/hr. ECO mode runs it at half heat, BOOST runs it on high with the blower at full speed for 30 minutes, and the built-in thermostat holds anywhere from 64°F to 82°F. The flame, ember bed and top light all run with the heat off, so you can use it year-round, and a switch behind the glass can lock the heater out completely.
Can I put a mantel above it?
Yes. Wall mounted, leave at least 2" between the top of the fireplace and the mantel so it can be lifted off its bracket for service; recessed, the mantel can sit right at the top edge (0"). Use heat-resistant paint or lacquer on the mantel.
How do I control it?
With the included premium remote — flame, ember bed, top light, heater, thermostat and a 7-day timer — the touch panel on the unit, or the Napoleon Home app over Wi-Fi, which also works with Google Home and Alexa. A wall-mount controller with a black or white faceplate is available separately.
Where can it be installed?
Indoors only, and not in a bathroom. It meets HUD standards for manufactured homes. Keep curtains, furniture and bedding at least 36" away, and never cover its heat vents with finishing material.
What happens in a power outage?
It runs on household power, so it goes off during an outage. When the power returns it resets to its factory settings, so set your flame, colors and heat again.
What’s included, what’s required, and what’s optional?
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Included in the box: 5,000 BTU/hr (1,500 W) heater with built-in thermostat; Smokey gem and rusty iron glass media; Premium remote control; Wi-Fi control from the Napoleon Home app; Factory-installed one-piece trim; Two side cover panels for wall-mounted installs; Wall mount bracket, hardware kit and cord covers; 3-year limited parts warranty.
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Required to complete the installation, purchased separately: Electrical - a dedicated, grounded 120 V, 15 A outlet within reach of the cord, or a hard-wired 120 V connection by a qualified electrician (hard-wiring is required for recessed installs); no extension cords; Recess Framing - a 42-3/4" wide x 17-1/2" high opening at least 4" deep in a non-load-bearing wall, for recessed installs only; Finishing Material - drywall, tile or similar facing butted to the firebox flanges, for recessed installs only.
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Optional: Wall-mount controller with a black or white faceplate — the fireplace operates fully from its remote, control panel and app without it.
How does the warranty work if I buy it online?
Napoleon covers the Astound SlimMount with a 3-year limited warranty: replacement parts — heater, fan, motors, switches, the remote and the LED lights among them — are free for three years, and labour is covered in the first year. The Torch Guys is an authorized Napoleon dealer, so the full factory warranty applies, and if you ever need a part we file the claim with Napoleon for you. Keep your invoice and the model and serial number.
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