The SimpliFire Allusion Slim is one of the thinnest built-in electric fireplaces SimpliFire sells, and it is built specifically to solve one problem: adding a linear fireplace to a wall that cannot lose much depth. If you are comparing this allusion electric fireplace against thicker built-in units, the decision usually comes down to three things: how much wall depth you actually have, how large a viewing area you want, and how much heat you expect it to produce. Here is what the specs say once you get past the marketing copy.
TL;DR
The Allusion Slim is a linear electric fireplace built around a 4-inch overall recess depth, thin enough to fit inside a standard 2x4 or 2x6 wall cavity without building out a deeper chase. It uses a crystal ember bed with a small log accent, LED flame lighting in four color combinations (blue, blue and orange, orange, and orange and blue), and 14 ember bed lighting options. Flame brightness, color, and the heater are controlled independently through a multifunction remote, so the unit can run flame-only year-round with the heat switched off.
Every width in the lineup, 40 through 72 inches, uses the same 5,000 BTU heating element rated at 1,500W and 12.5A on a 120V connection. SimpliFire's own installation documentation recommends a 15-amp circuit at minimum and a 20-amp dedicated circuit for headroom. The unit can be wired directly (hardwired) or run on a standard plug, and it is CSA certified and UL listed.
Because the depth stays at roughly 4 inches across every size, the Allusion Slim works in rooms where a standard built-in fireplace would require framing out the wall. That makes it a common pick for basements with limited depth behind the drywall, bedrooms where floor space matters more than a large surround, and renovations where the wall is already framed and cutting deeper isn't practical.
Our Top Pick: Simplifire Allusion Slim, shown here recessed into a basement media wall
Sizing follows room width more than heat needs, since the BTU output does not change between models. A 40-inch unit suits a bedroom or small den, while the 60- and 72-inch widths fill a media wall or great room feature wall without dominating a smaller space. Since the heater tops out at 400 sq ft regardless of size, treat this as a zone heater and ambiance piece rather than a home's primary heat source, which matches SimpliFire's own guidance for the model.
If you don't want to cut into drywall at all, SimpliFire sells a Crestline wall-mount surround kit for the 50- and 60-inch Allusion Slim. It pairs a painted white surround with the fireplace and mounts directly to the wall, which is worth considering in a rental, a finished basement where you don't want to reopen the ceiling for wiring access, or any wall where you later learn there's a plumbing or duct run behind the drywall that rules out a recessed cut.
The ultra-thin cabinet also means less flexibility on airflow clearance than a deeper unit. Because the heater vents sit close to the front face, keep the same 3-foot clearance from curtains, upholstery, and other combustibles that applies to any electric fireplace, regardless of how slim the housing looks.
Since heat output is identical across every width, size selection comes down to viewing area and room proportions rather than warmth. The 40-inch model suits a bedroom wall roughly 5 to 6 feet wide once you account for side clearance and trim. The 50- and 60-inch sizes are the most common picks for a standard living room media wall, and they're also the only two widths compatible with the optional Crestline surround kit. The 72-inch model is built for a wider feature wall or an open-concept space where a smaller unit would look undersized against the surrounding wall.
The closest in-house comparisons are the SimpliFire Triton, a 3-sided built-in from the same manufacturer, and the Modern Flames Orion Slim. The Triton is designed for see-through or corner installs and is not built to the same shallow depth as the Allusion Slim, so it needs more wall cavity. The Orion Slim, by contrast, is also built for wall-mount or recessed installs, but it steps up to a 5,000/10,000 BTU dual-output heater on a dedicated 20-amp circuit, which makes it a stronger choice when heat output matters more than depth.
In short, the Allusion Slim wins on installation flexibility in thin walls. The Orion Slim wins if you want more heat from the same footprint and don't mind the deeper install. Neither is a strict upgrade over the other, they are built for different constraints.
Worth Considering: the 50-inch Allusion Slim, fully recessed into a bedroom wall
SimpliFire also sells a Crestline wall-mount surround kit for the 50- and 60-inch sizes, which lets you add the fireplace without cutting into drywall at all if a fully recessed install isn't an option.
Yes. The flame effect and heater are controlled separately from the remote, so you can run the Allusion Slim as a flame-only feature through warmer months.
Plan for roughly 4 inches of framing depth. SimpliFire designs the Allusion Slim to sit inside a standard 2x4 wall cavity, so most interior walls will accommodate it without furring out the wall.
Not necessarily for a plug-in install on an existing dedicated circuit. If you are hardwiring the unit or need to add a new circuit, SimpliFire and most manufacturers in this category recommend a licensed electrician, especially to confirm the circuit is dedicated rather than shared with other outlets.
SimpliFire, a Hearth & Home Technologies brand, covers the Allusion Slim with a 2-year limited warranty.
Yes, a standard mantel shelf works above a recessed install as long as you keep the manufacturer's required clearance between the top of the fireplace and the mantel shelf, which is listed in the installation manual for your specific size. If you'd rather skip building a surround, the optional Crestline kit already includes a matched mantel shelf sized to the 50- or 60-inch unit.
Browse the rest of the SimpliFire lineup or compare it against other slim options in our wall-mounted electric fireplace collection before you commit to a size.
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The Simplifire Allusion Slim is a 4-inch deep linear electric fireplace built to recess into a standard 2x4 wall. We break down its heat output, sizing options, and price across all four widths.
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