Masarflame Electric Fireplace Inserts

The two Masarflame series aren't interchangeable — they're built for different walls, different aesthetics, and different buyers. The Flemington retro inserts run 8.5"–8.86" deep and carry a physical three-sided brick interior with life-like resin logs. The Charlton inserts are 5.5" deep, fit standard 2×6 framing straight from the box, and offer a cleaner modern look with your choice of log set or crystal ember bed. Pick the series based on your wall first, then choose a size.

What the Flemington Series Is Built For

The Flemington series is designed to go into spaces that already have depth — existing masonry fireplace openings, custom-framed pockets in a 2×6 wall with additional build-out, or purpose-built surround cabinets. The insert dimension on the 40" model is 37"–37.2" wide × 8.86"–9.06" deep × 26.6"–26.8" tall. That depth is what creates the dimensional realism: the logs sit in front of a three-sided brick-lined chamber, not against a flat printed panel. Bob Vila's 2025 electric fireplace roundup specifically called out the Flemington 40" for its "accurate rendering of an authentic log fire" — that recognition comes directly from the physical construction, not a software trick.

One thing worth knowing: the Flemington series has no thermostat. You get two heat levels (750W and 1500W) and a timer up to 9 hours. That's enough for most people who want zone heating and ambiance — but if you want the unit to cycle on and off automatically to maintain a set room temperature, that's a Charlton feature.

What the Charlton Series Is Built For

The Charlton fits 2×6 framing at exactly 5.5" deep. If you're building a new media wall, framing an opening in a standard interior partition, or doing a clean renovation, this is the series that goes in without modification. The 36" model weighs 44.1 lbs — manageable for a solo install — and the 72" standard model tops out at 93.3 lbs, where a second set of hands matters. Every Charlton unit includes a thermostat that cycles between 62°F and 86°F, an LCD touch panel, and a remote.

The WiFi versions of the Charlton (42" and 72") add Tuya app control and Alexa compatibility. Worth noting: Alexa controls power on/off only — full flame color and thermostat adjustments require the app or the touch panel. The app connects over 2.4GHz WiFi, not 5GHz, which catches people off guard when their router is broadcasting a merged network.

A Direct Comparison by the Numbers

Both series support flame-only operation — you can run the LED effect with zero heat output, all year. That's not a Flemington-exclusive feature. And both top out at the same 1500W / ~5,100 BTU heating output, which covers supplemental zone heating for rooms up to 400–450 sq ft. Neither series is a primary heat source.

The honest summary: if you have an existing masonry opening or you're building a surround cabinet with real depth, the Flemington's brick interior and crackling speaker will look and sound better than anything at this price range. If you're doing a clean new-construction install into standard wall framing, the Charlton fits without modification and gives you thermostat control and optional WiFi the Flemington doesn't offer.

Start with your opening dimensions, not the product name. The width labeled on every Masarflame insert is the overall size — the full unit including the face frame. The insert dimension — the part that actually slides into your wall — is always smaller. Buy based on your rough opening, not the product's headline number.

Replacing an Existing Masonry Fireplace

Measure the interior of your existing fireplace opening: width, height, and depth. You need the insert dimension to fit inside those numbers — not the overall unit dimension. The Flemington 40" insert measures 37"–37.2" wide × 26.6"–26.8" tall for the portion that goes into the wall. If your masonry opening is 38" wide and 27" tall with at least 8.86" of depth, that unit fits. The face frame of the 40" overall unit is 40" wide × 27.32" tall, which will overlap the surround slightly — that's normal and intentional.

If there's a visible gap between the insert face and your surround, a Masarflame trim kit covers up to 5.8" per side in each direction. The 40" trim kit has an overall size of 48.9" × 32.1", meaning it can bridge an opening that's as much as 5.8" wider on each side than the fireplace face. No drilling into the wall required — the kit attaches to the unit itself.

New Construction or Renovation Framing

Framing a new opening gives you full control. The key constraint is wall depth. The Charlton series needs 5.5" of cavity — exactly what a 2×6 stud wall provides. Frame your rough opening to match the insert dimension, not the overall unit size. For the Charlton 42", that's 42.01" wide × 21.65" tall overall; your rough opening should accommodate those dimensions with the unit sitting flush.

If you're using 2×4 framing (3.5" cavity), neither series fits recessed without a built-out pocket or a chase wall in front of the standard studs. This is one of the most common post-purchase surprises in the category — measure your framing depth before ordering.

Four Buyer Scenarios Mapped to Specific Models

Scenario 1 — Replacing a traditional masonry fireplace, existing brick surround, want the most realistic flame effect. The Flemington retro series is the right choice. Match the size to your interior masonry opening. Most standard residential fireplaces have interior widths in the 28"–42" range. The Flemington 36" (insert: 32.6"–32.7" wide × 20"–20.1" tall) works for tighter openings; the Flemington 40" (insert: 37"–37.2" wide × 26.6"–26.8" tall) fits most standard openings. Add the matched trim kit to cover any gap around the face. You get the three-sided brick interior, crackling speaker, and resin logs — the combination that earned the 40" its Bob Vila recognition.

Scenario 2 — New media wall build, standard 2×6 framing, want a thermostat and clean modern look. Any Charlton standard insert fits directly. Size choice depends on how wide your media wall opening is. The 36" Charlton (36.02" × 21.65" × 5.5") is common for bedroom or office builds; the 50" (50" × 21.65" × 5.5") suits a living room media wall; the 60" (60" × 21.65") and 72" (72.05" × 21.65") are for wide statement walls. All share the same 5.5" depth requirement and the same thermostat range (62°F–86°F).

Scenario 3 — Want app control, Alexa integration, and more flame color options. Two tiers here. The Charlton WiFi models (42" and 72") connect via the Tuya app, offer 3 flame colors and 5 brightness levels, and work with Alexa for power control. They fit 2×6 walls at 5.5" deep. For significantly more flame color flexibility — 13 color combinations plus 3 independent top-light colors — step up to the EF-series. The EF54E (54") and EF72E (72") both support recessed or wall-mount installation, use the Xarlyn Smart app instead of Tuya, and carry CSA certification. The EF-series also supports hard wiring in addition to plug-in.

Scenario 4 — Renting or can't cut into drywall, want ambiance without heat in a smaller room. The EF-series wall-mount option is the straightforward answer — hang it without framing work, just like mounting a TV. Or consider the smaller Flemington inserts for a false-front surround cabinet that doesn't require wall penetration. The 25" Flemington (25.35" × 8.84" × 21.1") and 28" Flemington (28.7" × 8.84" × 21.2") are compact enough to work with smaller custom surrounds. Flame-only mode runs with zero heat output on every Masarflame unit — no heater draw, just the LED effect and crackling speaker.

Quick Size Reference by Series

• Flemington retro inserts: 25", 28", 30", 33", 36", 40", 43", 50" — all require 8.5"–8.86" wall depth, all include brick interior and crackling speaker
• Charlton standard inserts: 36", 42", 50", 60", 72", 84" — all 5.5" deep, fit 2×6 framing, thermostat included
• Charlton WiFi inserts: 42" and 72" — same 5.5" depth as standard Charlton, adds Tuya app and Alexa via 2.4GHz WiFi
• EF smart dual-install: 54" (EF54E) and 72" (EF72E) — 5.95" overall depth, 5.5" recessed cavity, wall-mount or recessed, 13 flame colors, Xarlyn Smart app, CSA certified

More Masarflame returns trace back to wall depth mismatches than any other factor. The fix is simple: measure your cavity depth before ordering. A unit that's 1" too deep to fit your existing firebox is a return — not a minor adjustment. Here's what each series actually requires and how to measure correctly.

Understanding 2×4 vs. 2×6 Wall Framing

Standard US residential construction uses either 2×4 or 2×6 dimensional lumber for interior and exterior walls. A 2×4 stud is actually 1.5" × 3.5" — the 3.5" figure is the relevant one, because that's the depth of the cavity between your drywall surfaces. A 2×6 stud is 1.5" × 5.5", giving a 5.5" cavity. Most interior partition walls in homes built before the 1990s are 2×4. Exterior walls and many newer interior walls are 2×6.

Why does this matter? The Charlton series is exactly 5.5" deep. It fits a 2×6 wall with nothing left over. It does not fit a 2×4 wall without a built-out chase — the unit would protrude roughly 2" from the drywall surface. If you're not sure what framing your wall has, drill a small exploratory hole and measure the cavity depth, or check your home's construction documents.

What the Flemington's Depth Actually Means

The Flemington retro series requires 8.5"–8.86" of cavity depth — significantly deeper than any standard stud wall provides. That depth is structural to the aesthetic: the three-sided brick interior and resin log set need that space to create dimensional distance between the flame and the back wall. You can't get the same look from a 5.5" chamber.

Where does that depth come from in a typical install? Three common scenarios:

• Existing masonry fireplace opening: Most traditional wood-burning or gas fireplace boxes have interior depths of 12"–20". The Flemington insert slides in with room to spare. This is the most common Flemington use case — dropping a retro electric insert into a firebox you've stopped using.
• Custom-framed surround cabinet: A purpose-built cabinet or built-in entertainment center can be constructed to any depth. Frame the pocket at 9" or deeper and the Flemington fits cleanly.
• Chase wall in front of standard framing: Adding a second framing layer in front of a 2×4 or 2×6 wall can create a deeper pocket, but this is a construction project — not a simple install. If you're going this route, build the pocket to at least 9.5" depth to give yourself clearance on the full insert dimension range (8.5"–9.06" including tolerances).

How to Measure an Existing Masonry Opening

Take three measurements before ordering any Flemington insert:

• Interior width: Measure the inside width of the firebox opening at its narrowest point — not the decorative surround width, but the actual opening into the firebox. The insert dimension needs to be smaller than this number. For the Flemington 40", the insert is 37"–37.2" wide. Your interior opening needs to be at least 37.2" wide.
• Interior height: Same logic. The Flemington 40" insert is 26.6"–26.8" tall. Your opening needs to clear that height.
• Depth: Measure from the front plane of the firebox opening straight back to the rear wall of the firebox. You need at least 8.86"–9.06" of clear depth for the 40", 43", and 50" Flemington models. The 25", 28", 30", 33", and 36" models run 8.5"–8.7" deep.

One thing to check: some masonry fireboxes have a raised hearth floor or a gas line stub that reduces usable depth. Measure at the floor of the firebox, not at the top, and account for anything that projects into the opening.

When a Trim Kit Solves the Problem

If your masonry opening or rough-cut drywall is slightly larger than the insert face — common when you're replacing an older insert or when a rough opening was framed generously — a Masarflame trim kit covers the gap. Every trim kit provides 5.8" of expansion coverage per side, attaches to the fireplace unit without drilling into the wall, and comes in an antique black metal finish that matches the Flemington series.

Specific kit sizes and what they cover:

• Trim Kit for 30" insert: overall 39.44" × 29.5" — covers openings up to that max dimension
• Trim Kit for 33" insert: overall 41.9" × 29.5"
• Trim Kit for 40" insert: overall 48.9" × 32.1"
• Trim Kit for 43" insert: overall 51.9" × 32.1"
• Trim Kit for 36"×21" (Charlton): overall 44.5" × 25.7"

The trim kit is sized per model — not universal. Confirm you're ordering the kit matched to your specific insert size. Hardware and instructions are included with every kit.

Every Masarflame insert and wall mount tops out at 1500W and approximately 5,100 BTU. That's enough to provide supplemental zone heating for a room up to 400–450 sq ft — a bedroom, a home office, or a defined living area with reasonable insulation. It's not enough to heat an open-plan first floor, a drafty older home, or a space you expect to keep warm without your central HVAC running.

This is the most important expectation to set before buying. Buyers who understand this stay satisfied. Buyers who expect a 1500W electric insert to replace their furnace will be disappointed — and the reviews across the category confirm it.

What 5,100 BTU Actually Covers

As a rough rule, 1 BTU per hour heats approximately 1 sq ft in a well-insulated modern room. At 5,100 BTU, you're looking at adequate supplemental heat for a 400–450 sq ft space — think a 20' × 20' room with standard 8' ceilings. The Charlton WiFi 42" is listed at 450 sq ft coverage; the standard Charlton models and all Flemington inserts are listed at 400 sq ft. The difference is minor and both assume the unit is providing supplemental zone heat, not serving as the sole heat source.

Running at 750W drops that output to approximately 2,559 BTU — better for a smaller room or when you want just a touch of warmth without the full 1500W draw.

Flame-Only Mode Is Not a Power Draw Issue

Every Masarflame unit runs the LED flame effect completely independently from the heater. Flame-only mode activates the LEDs and, on the Flemington series, the built-in crackling speaker — but the 1500W heating element stays off entirely. The LED draw is a fraction of the heating draw. You can run the ambiance effect in July without adding any measurable heat to the room.

This is genuinely useful and worth knowing upfront. A significant portion of buyers use the flame effect more than the heat. Running flame-only mode adds negligible cost to your electricity bill compared to the heater cycles.

Who Should Not Buy These as a Heat Source

Be direct about this: if your primary goal is heating a room above 450 sq ft, or if you're in a climate where you need consistent heat for more than a few hours a day, a 1500W electric insert is not the right tool. All 120V electric fireplaces in this category share the same ceiling — the standard residential outlet limits the practical maximum to about 1500W without hardwiring to a dedicated circuit.

The EF-series models (EF54E and EF72E) support hard wiring, which means they can be installed on a dedicated circuit by a licensed electrician — but the rated output remains 1500W / ~5,120 BTU. Hard wiring improves installation permanence and eliminates cord management, not heat output.

The Charlton thermostat helps by cycling the heater on and off to maintain a set temperature rather than running continuously. Set it to 68°F and it'll hold that temperature in a properly sized room by running the 750W or 1500W element as needed. The Flemington series doesn't offer thermostat cycling — its two heat modes run continuously until the timer shuts the unit off or you change the setting manually.

All Masarflame units include automatic overheat protection — the heating element cuts power if internal temperatures reach an unsafe threshold, without any action required from you. The EF-series models (EF54E and EF72E) carry CSA certification, which is an independently verified safety standard relevant to buyers in apartments, condos, and rentals where product certification matters for insurance or building management compliance.

What Overheat Protection Actually Does

The overheat protection circuit monitors internal component temperatures. If the unit's internal heat rises above a safe threshold — from blocked airflow, a malfunctioning component, or extended operation in a confined space — it disconnects power to the heating element automatically. The flame LEDs may or may not continue operating depending on the specific trigger; the heater stops.

This isn't a feature unique to Masarflame — most electric fireplaces at this price point include it. What matters is that it's a real hardware cutoff, not software-dependent protection. You don't need to notice a problem for the safety system to act.

Practical implication: don't block the front air vent on any Charlton or Flemington insert. All Masarflame units use a front-facing heater vent at the top of the unit. Objects placed directly in front of that vent (furniture, curtains, papers) restrict airflow and can trigger the overheat cutoff. Keep the vent clear — 12" of clearance is a reasonable minimum.

CSA Certification on the EF-Series

The EF54E and EF72E are CSA certified. CSA (the Canadian Standards Association) is a widely recognized third-party testing organization whose certification is accepted across North America, including by many US state building codes and insurance underwriters. For buyers in apartments or condos where the building management requires certified appliances, or in states where electric heating appliance certification affects home insurance terms, the CSA mark on the EF-series is a meaningful distinction.

The standard Charlton and Flemington series are not listed as CSA certified in the product data. If certification is a requirement for your specific situation — a rental agreement, a condo board rule, or an insurance policy — confirm before purchasing which certification applies.

Ventless Operation and What It Means

Every Masarflame unit is ventless — no gas line, no exhaust flue, no combustion byproducts. There's nothing to vent because nothing burns. The "flame" is an LED effect reflecting off physical media (logs, crystal rocks, or the brick interior on the Flemington series). The only byproduct of operation is heat from the electric heating element and a small amount of airflow from the front blower.

This makes Masarflame inserts viable for rooms where a real fireplace or gas insert wouldn't be permitted — apartments, condos, offices, and rooms without existing chimney infrastructure. The ventless designation isn't a workaround or a compromise; it's simply how electric fireplaces work. No CO risk, no smoke, no ash.

Warranty terms vary across the Masarflame lineup — don't assume one product's warranty applies to all of them. The EF-series models (EF54E and EF72E) carry the most explicit coverage: 1 year of free replacement parts for malfunctions plus lifetime maintenance guidance. The standard Charlton and Flemington series list a limited warranty, with some Charlton listings noting "one year warranty." Trim kits show limited warranty on most sizes, with the 30" trim kit specifically listing a "Limited Lifetime" warranty on the frame itself.

What the Warranty Covers by Series

• EF54E and EF72E: 1 year free replacement part for malfunction; lifetime maintenance guidance at no charge; 30-day free return and refund for damaged or defective items on delivery
• Charlton standard and WiFi series: Limited warranty (some listings specify one year); customer service available through Amazon product listings
• Flemington retro series: Limited warranty listed across the lineup; specific duration not consistently stated in product data
• Trim kits: Limited warranty on 33", 40", and 43" kits; Limited Lifetime warranty on the 30" trim kit frame

Honestly: the warranty terms here are shorter than some competitors at this price range, and the inconsistency across listings is something to be aware of. If warranty length is a deciding factor, the EF-series is the most clearly documented — 1-year parts replacement with lifetime support guidance is a specific and verifiable commitment. For the Charlton and Flemington series, check the individual Amazon product listing for the exact current warranty language before purchasing.

How to Reach Support

Masarflame customer service operates through Amazon. All product listings include a customer contact option via Amazon's messaging system. The product descriptions consistently note that questions before and after purchase can be directed through Amazon, and "satisfied solutions would be provided" — that language appears across the full lineup. The EF-series specifically mentions lifetime maintenance guidance as a separate ongoing resource beyond the one-year parts warranty.

For installation questions — which come up more often than product malfunction questions, based on the category's review patterns — the included user manuals have been updated based on customer feedback. The Charlton and Flemington listings both note easy-to-follow installation instructions are included in the box. If you run into a dimension question or WiFi setup issue the manual doesn't cover, the Amazon contact channel is the documented path.

Parts and Long-Term Maintenance

The LED components in all Masarflame units are the lowest-failure-risk part of the system — LEDs in this application don't have a meaningful wear rate under normal use. The heating element (quartz on Charlton/EF-series, resin on Flemington) and the blower motor are the mechanical components most likely to need attention over time. The EF-series lifetime maintenance guidance is intended to cover exactly these scenarios — getting technical assistance on component-level questions even after the one-year parts window closes.

For the Flemington series specifically, the resin log set and ember bed are physical components that sit in the firebox. They're not subject to electrical wear, but they can be repositioned or replaced if damaged. The Charlton WiFi series ships with both a Driftwood and a Crystal ember bed option in the box — you choose which one to display, and you can swap between them yourself without tools.