
Marsail 50" App Control, 4777 BTU
6.8Good · out of 10$239.99 Price on Sep 30, 2026 · may have changed- Stated: 50 in wide · 4,777 BTU/h · Recessed (in-wall)
- Built-in & wall-mounted inserts

Product images: Amazon listings
A 50-inch width, a 4,777 BTU heater and 20 flame colors: the Marsail 50" App Control (4777 BTU) covers what matters most in a recessed or wall-mounted fireplace. Add WiFi and app control and it makes a good match for running the fireplace from the sofa or your phone.
| Brand | Marsail |
|---|---|
| Category | Built-in & wall-mounted inserts |
| Stated width | 50 in |
| Stated heat output | 4777 BTU/h |
| Installation type | Recessed (in-wall) |
| Flame colors | 20 |
| Controls | Remote, app / WiFi |
| Timer | Up to 8 hours |
| Media | Crystals |
| ASIN | B0DLL2J999 |
Full listing title: Marsail 50″ Electric Fireplace Heater with App & Remote Control, 4777 BTU Heat Output, Ultra-Slim Wall-Mounted or Recessed Electric Fireplace Inserts with Timer, 20 Flame Colors,SLELF02B-50
| Stated width | 50″Exact listing |
|---|---|
| Stated heat output | 4777 BTUExact listing |
| Installation type | Wall-MountedExact listing |
The two recessed or wall-mounted fireplaces closest to it on our rating, with a dated price.



The heat the listing states. Plenty to take the chill off the room you sit in; how far it reaches depends on your insulation, windows and ceiling, and our supplemental heat planner turns your room into a rough answer.
What it has going for it
50 in wide, per the listing. Wide enough to be the focal point of a living-room wall. Check in the installation drawing whether the figure is the frame or the viewing area, then hold it against your wall cavity.
4,777 BTU. Supplemental heat for the room you sit in: it takes the edge off a cold evening while the furnace stays turned down. Real coverage depends on your insulation, windows and ceiling height. Our supplemental heat planner puts it in numbers for your room.
20 flame colors. Classic orange for winter evenings, something bolder when friends are over, or just the embers glowing behind a movie. How real each setting looks is for your eyes to judge in the photos and videos; the count is the seller's. Our flame effects guide sorts the settings you'll use from the ones you'll forget.
For the living room, 50 inches of fire are wide enough to anchor a big wall. All those flame colors are made for showing off when friends come round. The app or Alexa can start the fire before you are even home.
For a bedroom or a study, the timer (up to 8 hours) switches it off after you fall asleep.
On balance it is a living-room centrepiece that can also do a smaller room, not the other way round.
The seller states, word for word, in the Marsail 50" App Control (4777 BTU) listing:
This electric fireplace from Marsail delivers an impressive 4777 BTU of heat to efficiently warm up an entire room.
You can also operate the fireplace with the included remote or easy-to-use control panel, offering maximum convenience and flexibility.
The electric fire place offers 20 flame color modes and an automatic color-changing mode, all with stunning crystal effect.
Marsail’s electric fireplace operates at a sound level of less than 45 dB to ensure a peaceful environment that doesn’t disturb relaxation or sleep.
Wall mounting features a slim, elegant 3.9′′ profile to save space, while recessed mounting requires proper framing in a compatible wall cavity before installation.
Hold these against the manual of the exact model before you order.

What the Marsail 50" App Control (4777 BTU) listing names:
What the listing names with it: Remote control, Crystal media.
Tick them off on delivery day, before the cardboard goes out.
Check the opening, the depth and the outlet against your wall before you order.

At the price on Sep 30, 2026, each stated inch of width costs about $4.80. That puts it in the cheaper third of the 117 inserts we have a price for.
Cost per inch is only a rough yardstick: the heater, the flame options and the build count as much as the width.
The button opens the exact listing (ASIN B0DLL2J999), where today's price, stock and seller apply.

Want a wider fire for a bigger wall? The Touchstone Sideline 60" Smart (9.5/10) states 60 in.
Short on wall space? The Innoflame 36" Insert with Log Set (7.7/10) is 36 in wide, per its listing.
Want the flame without the heat in summer? The Xbeauty 60" Recessed and Wall Mounted (9.3/10) states a flame-only mode.
Our take
We like the Marsail 50" App Control (4777 BTU) for a 50-inch width and a 4,777 BTU heater. No buyer reviews yet, so this Marsail recessed or wall-mounted fireplace has to win you over on paper. The catch with the Marsail: no flame-only mode in the listing, while most picks here state one. We'd pick it if you want the chill off one room on cold evenings; otherwise, put it next to the Sixfivsevn 36" Recessed and Wall Mounted first.
A big, flat box with glass inside: open it with two people and check the front before the cardboard goes out.
Run through the flame colors once, then settle on the one that suits the room. The 4,777 BTU heater takes the chill off the room you sit in.
The remote on the sofa arm, the timer for bedtime, and a quick dust of the glass now and then. Our maintenance guide has the rest.
Check whether the flame can run without the heater; the listing we read doesn't say so.
Before you order the Marsail 50" App Control (4777 BTU): check your wall, because the 50-inch figure has to match your opening, and a listing width can mean the frame or just the viewing area.
Draw the opening on the wall with painter's tape at the real size, step back, and check it against the installation drawing. Our recessed installation guide lists the clearances to ask about.
Pick the outlet before you pick the finish: a free one close by, nothing heavy on the same circuit, and no extension cord. Our power requirements guide lists the questions to ask.
4,777 BTU stated. Treat it as supplemental heat for one room. Our supplemental heat planner turns your square footage into a rough answer.
Glass-fronted inserts are big, flat boxes: plan two people for the unboxing, and decide early who frames the wall. Our built-in vs wall-mounted guide weighs recessed against wall-mounted.
How the Marsail 50" App Control (4777 BTU) stacks up against the closest alternative, the Sixfivsevn 36" Recessed and Wall Mounted.
| Criterion | Marsail 50" App Control, 4777 BTU | Sixfivsevn 36" Recessed and Wall Mounted |
|---|---|---|
| Our rating | 6.8/10 | 6.8/10 |
| Width | 50 in | 36 in |
| Heater | 4,777 BTU | 1,500 W |
| Coverage claim | Not stated | 400 sq ft |
| Flame colors | 20 | 12 |
Both score 6.8/10. The Sixfivsevn 36" Recessed and Wall Mounted adds more stated heat (1,500 W) and a bigger coverage claim (400 sq ft), while the Marsail 50" App Control (4777 BTU) brings a wider unit (50 in) and more flame colors (20).
We rate it 6.8/10 (good). The rating comes from its documented listing alone, as no customer-review record is captured yet.
Its listing states a 50-inch width, a 4,777 BTU/h heater output and recessed (in-wall) installation. Those are the maker's figures, so check in the installation drawing whether the width means the frame, the firebox or the opening. Our supplemental heat planner puts 4,777 BTU/h in context for your room.
The listing states 4,777 BTU/h. Read the supply, plug and circuit conditions on the exact listing and in the manual before you order, and never run a heater on an extension cord or a shared power strip. Anything beyond an existing standard outlet, hardwiring or 240 V included, is a job for a licensed electrician.
Its listing states a 50-inch width, a 4,777 BTU heater, 20 flame colors, app control and a 8-hour timer. Those are the seller's figures; for how real the flames look in a living room and how loud the fan runs at night, the buyer reviews are the better guide.
Your wall: draw the opening on the wall with painter's tape at the real size, step back, and check it against the installation drawing. Our recessed installation guide lists the clearances to ask about. The outlet: pick the outlet before you pick the finish: a free one close by, nothing heavy on the same circuit, and no extension cord. Our power requirements guide lists the questions to ask. Heat for your room: 4,777 BTU stated. Treat it as supplemental heat for one room. Our supplemental heat planner turns your square footage into a rough answer. Delivery and install: glass-fronted inserts are big, flat boxes: plan two people for the unboxing, and decide early who frames the wall. Our built-in vs wall-mounted guide weighs recessed against wall-mounted.
We link to the exact listing on Amazon, where today's price, stock and seller apply. It is an affiliate link, and it has no effect on the rating.
If the Marsail 50" App Control, 4777 BTU hasn't sold you yet, see where it ranks, read the guides that feature it or browse all built-in & wall-mounted inserts.