Quick Answer: Electric fireplace dimensions vary far more by install type than by brand — a slim wall-mount like R.W.Flame’s 36-inch recessed unit is just 3.85 inches deep, while a firebox insert like the ClassicFlame 3D Infrared runs closer to 8.9 inches deep to fill an existing masonry opening, per each manufacturer’s own spec sheets. Height and width swing even more: a standard linear unit like the Dimplex IgniteXL 50 is 50.25” wide but only 16” tall, while a vertical model like the Napoleon Allure Vertical 32 flips that to 15.25” wide and 32” tall. Measure your actual wall cavity and firebox opening before ordering — don’t assume “recessed” or “50-inch” means one fixed depth or height across brands.
Product photos make every electric fireplace look roughly the same size. They aren’t. Depth alone ranges from under 4 inches to nearly 9 inches depending on whether you’re buying a slim wall-mount or a firebox insert, and that difference decides whether a unit fits inside a standard stud wall or needs a masonry opening. Here are real, manufacturer-sourced dimensions for five models across the main install types this site covers.
Real dimensions, by model
| Model | Install type | Width | Height | Depth | Price |
|---|---|---|---|---|---|
| Dimplex IgniteXL 50 | Linear wall-mount/recessed | 50.25" | 16" | ~5.5"–6" | $3,049.99 |
| Touchstone Sideline Elite 50 | Linear wall-mount/recessed | 49¾" | 19¼" | 5½" | ~$999–$1,499 |
| R.W.Flame 36" Recessed | Ultra-thin wall-mount/recessed | 36" | 18.1" | 3.85" | ~$180 |
| ClassicFlame 26" 3D Infrared | Firebox insert | 27" | 17.7" | 8.9" | ~$300+ |
| Napoleon Allure Vertical 32 | Vertical wall-mount | 15.25" | 32" | 5.5" | ~$429 |
Sources: manufacturer and retailer spec sheets for each model (Dimplex, Touchstone, R.W.Flame, ClassicFlame, Napoleon).
Why depth is the number that actually matters
Width gets all the attention because it’s the number in the product name, but depth is what decides whether a unit fits your wall at all. As our sizing guide covers, most recessed linear units need roughly 5–7 inches of depth to clear a standard 2x6 stud wall (~5.5” actual framing depth) — the Dimplex IgniteXL and Touchstone Sideline Elite both land right in that band. R.W.Flame’s ultra-thin design is the exception: at 3.85 inches deep, it’s built to fit inside a shallower 2x4 wall (~3.5” actual) without furring the wall out, which is a real advantage in an older home or an interior partition wall that wasn’t framed with a fireplace in mind. Always check the specific model’s rough-opening depth — “recessed” isn’t a single standard measurement. Multi-sided units need extra attention here too: the Touchstone Sideline Infinity Pro runs about 9¼”–9¾” deep to house glass on more than one face, per our best two-sided electric fireplace guide — noticeably deeper than a standard single-sided linear unit.
Inserts are built deeper than wall-mounts, on purpose
A firebox insert isn’t just a wall-mount unit in a different box — it’s a different shape by design. Both the ClassicFlame 3D Infrared (8.9” deep) and R.W.Flame’s own freestanding/recessed insert model (about 9” deep) run roughly double the depth of a slim linear wall-mount, because inserts are engineered to slide into an existing masonry firebox opening, not a shallow stud cavity. That extra depth houses the heating element and flame mechanism further back, mimicking where a real gas or wood firebox sits. If you’re replacing an old firebox rather than building a new wall feature, measure the opening’s depth front and back before buying — our best electric fireplace insert guide and how to install an electric fireplace insert walkthrough both cover that measurement step in detail.
Vertical formats flip the usual proportions
Every model above except one is wider than it is tall. The Napoleon Allure Vertical 32 does the opposite — 15.25 inches wide and 32 inches tall — because it’s built for a narrow wall segment where a standard 36-inch-plus linear unit simply won’t fit: beside a doorway, in a stairwell, or in a small powder room. It’s covered alongside Napoleon’s other real, verified dimensions in our best Napoleon electric fireplace roundup. If your wall is narrow rather than short on depth, a vertical format solves a problem no amount of depth-shopping can.
Firebox dimensions vs. overall dimensions
One more gap that trips people up: some listings quote the firebox (the metal unit itself) and others quote the overall fireplace (unit plus any frame or bezel), and the two numbers aren’t the same. Touchstone’s own spec sheet for the Sideline Elite 50, for example, lists 49¾” x 19¼” x 5½” for the complete unit but 48 7/16” x 18” x 5⅛” for the firebox alone — about an inch smaller on every dimension. That inch matters if you’re cutting a rough opening to an exact size. Always confirm which measurement a retailer is quoting, and when in doubt, use the manufacturer’s own installation manual rather than a marketplace listing’s headline spec.
Touchstone Sideline Elite 50" Smart Electric Fireplace
- Manufacturer-confirmed depth of 5½ inches fits inside a standard 2x6 stud wall without furring, per Touchstone's own spec sheet.
- Same model covered in our best electric fireplace with a thermostat and best electric fireplace LED lights guides.
- Recessed or surface wall-mount, so a shallower wall still works with a surface install instead of cutting in.
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The bottom line
Don’t shop by width alone. Depth decides whether a unit fits a 2x4 or 2x6 wall (or needs no depth at all with a surface mount), inserts run roughly double the depth of wall-mounts because they’re built to fill a masonry opening, and a vertical format can solve a narrow-wall problem no standard linear unit can. Confirm the manufacturer’s exact spec sheet — and whether it’s quoting the firebox or the overall unit — before you measure twice and order once. For general sizing advice on matching width to your TV and room, see our electric fireplace sizing guide, or start with our best electric fireplace rankings.
Last updated September 2026: re-verified the Dimplex IgniteXL 50 price directly against Dimplex’s own store — corrected a stale $2,825–$3,050 range to the current $3,049.99, matching this site’s verified canon elsewhere. Other four models’ dimensions and prices unchanged.