Thirty-eight inches is the working width of a traditional fireplace opening. It is wide enough for a proper log bed and narrow enough to leave the brickwork intact on both sides.
38 Inch Electric Fireplace Insert at a Glance
- Fits a standard 37–40 inch opening
- Full log bed across the width
- 5,200 BTU heater and thermostat
- 9 inch body clears most firebacks
- Glass front, remote and timer
- No flue or chimney work
Who it suits: a period or masonry fireplace with a typical 38 inch clear opening.
Why 38 inches fits so many openings
Old masonry openings were built around a nominal 36 inch fireback, and once the render and the hearth are measured, the clear width usually lands between 37 and 40 inches. A 38 inch insert sits in that range with a small margin.
It is also the widest unit that still looks like it belongs in a period opening. A 42 inch insert in the same hole starts to eat the brick returns.
Depth is 9 inches, which clears most firebacks once the ash lip is removed. If the opening is shallower than that, a slim insert is the answer.
Heating performance and room coverage
The element runs at 1,500W and gives 5,200 BTU, cycling on a thermostat rather than sitting at a fixed output. Outside, expect it to run longer than it would indoors, which is honest rather than faulty.
In practice a 38 inch electric fireplace insert holds 400 to 600 square feet comfortably, and helps in a room up to about 1,000 square feet when the doors are shut and the walls are insulated. Placement matters less than most buyers expect, provided the outlet is not blocked, and the thermostat does the rest of the work.
The flame runs independently of the heater. Turn the heat off and the fire becomes lighting, which is how most people use it for eight months of the year.
The most common mistake with a 38 inch electric fireplace insert is buying it for the whole floor plan rather than the room you sit in. Match the unit to the room and the thermostat will cycle calmly instead of running flat out all evening.
Specifications and delivery
| Spec | Detail |
|---|---|
| Model | EP-INS-FENWICK |
| Type | Wide insert |
| Opening fit | 38 or 42 inch |
| Depth required | 9 inch |
| Heat output | 5,200 BTU / 1,500W |
| Flame | LED, 3 brightness levels |
| Controls | Remote, panel, timer |
| Media | Log bed with ember glow |
| Cord | 72-inch, 120V plug |
| Warranty | 12 months |
| Price | From $699 |
| Delivery | 2–5 business days, flat $50 under $1,000, free over $1,000 |
We check the flame, thermostat, cord and plug before dispatch, then ship it tracked.
Where it goes outdoors
Under a roof, facing the seating. That is the rule that decides whether an outdoor fire gets used or gets ruined. A pergola, a porch ceiling, a balcony above or a carport all count. Open sky does not.
Wind matters more than temperature. Place the unit so its outlet runs across the seating rather than into the prevailing breeze, and put a screen, a planter or a wall on the windward side if you can. A 5,200 BTU fire in a breeze loses most of its output.
Keep 20cm above and 30cm below the unit, and keep anything flammable clear. A __KW__ near a stack of cushions or a folded parasol is asking for trouble, and outdoors people store things in exactly those places.
Finally, site it near a weatherproof socket with an RCD or GFCI on the circuit. An extension lead across wet paving is the one genuine hazard in this category, and an outdoor socket costs less than the fire.
Running costs outdoors
Full heat draws 1.5 kWh an hour. At the US average of about 15 cents per kWh, that is roughly 22 to 23 cents an hour.
Compare that with a gas patio heater, where a 15kg cylinder lasts around ten hours and heats a radius whether or not anyone is sitting in it. Running one electric fire over one seating group is cheaper as well as more targeted.
Flame-only mode draws a few watts, so a summer evening of light costs pennies. Most owners run it that way from May to September and use the heat for the shoulder months only.
The Department of Energy explains how resistance heating is priced per kilowatt hour. Ten minutes there will save you guessing at running costs.
Installation without a trade
There is no flue, no gas and no vent, so a standard install needs no qualified fitter and no inspection afterwards.
- Measure both corner returns and check the unit clears every skirting board and window return before you unpack it.
- Move it into position with two people. Corner units are awkward rather than heavy, and one person will inevitably twist the frame trying to lift it alone.
- Level the feet against both walls. A corner out of square is normal; adjustable feet take up 12mm, which covers almost every room.
- Route the cord to the nearest outlet, keeping it behind the base rather than across the floor where it collects dust and gets kicked.
- Run the flame for ten minutes, then heat on low for five, then full output. If anything rattles at full heat, stop and call us.
The whole job takes about thirty minutes. If you are wall-mounting rather than placing a freestanding unit, add twenty minutes for the brackets.
Choosing the right size
We stock this 38 inch electric fireplace insert in 38 inch, 42 inch. All options share the same body height, so the decision is about width rather than height.
Start from the wall. If the usable span is under 45 inches, choose a smaller body; a wide unit in a short wall crowds the doorway and looks wedged in rather than fitted.
Then look at the room. A 400 square foot room suits any size, while a 600 square foot open-plan space benefits from the wider option, because heat leaves a wider outlet and the flame fills more of the corner.
If you are between sizes, go up. Buyers who regret a corner fireplace almost always regret buying small.
Care and safety
Wipe the glass with a non-ammonia cleaner and a microfibre cloth, only when the unit is cool. Hot glass and cold cleaner is how crazing starts, and no polish fixes it afterwards. It is the only maintenance a __KW__ really needs.
Dust the frame monthly. Matte finishes show dust in side light, and gloss finishes show fingerprints; both are handled by the same dry cloth.
Vacuum the intake grille every few weeks and keep fabric clear of it. The overheat cut-off protects the unit, not your evening. On a __KW__, the intake sits at the top of the body, where a curtain or a shelf can block it without anyone noticing.
Check the plug and cable once a year. A wall fire is often plugged in behind furniture, where a loose plug goes unnoticed for a decade.
What ownership looks like in year three
No fuel, no ash, no flue and no sweeping. The running cost is electricity and the maintenance is glass and dust.
The LED flame is rated for tens of thousands of hours, which is years of daily evening use. If an element fails inside the 12 month warranty we replace the unit rather than sending you a part and a diagram. That applies to every __KW__ we sell, whatever the size.
The finish is what ages. Matte black keeps its colour; pale and gloss finishes show the years. Cleaning with warm soapy water rather than abrasives is the whole secret, and it takes about a minute a month to keep a __KW__ looking new.
Returns run 30 days on unopened units. Keep the carton for a week after delivery and photograph the glass before you recycle the packaging.
Three mistakes to avoid
Buying for the room, not the wall. A __KW__ heats 400 to 600 square feet. Buy it for a bigger space and you will spend the winter disappointed by arithmetic rather than by the product.
Mounting it too high. Forty-eight inches to the centre is the height that works. Anything much above eye level turns a fire into a picture and puts the glow over people’s heads.
Sharing the circuit. At full heat these draw 12.5 amps. A kettle or a second heater on the same circuit will trip the breaker, and the fire will get the blame.
Measure twice
Write down four numbers: front width, back width, height and depth. A 38 inch insert needs 38.5 inches of front clearance at minimum, and the back of the opening is often an inch narrower than the front on older builds.
The ash lip
Most masonry openings have a raised ash lip at the front. It is usually loose and lifts out. If it is mortared in, it can be chiselled back, but only by someone who knows what is behind it.
Surround panels
If the opening is wider than 40 inches, a surround panel closes the gap and gives a finished edge. It is cheaper than rebuilding the brick returns and looks deliberate when it matches the trim.
Living with a 38 inch electric fireplace insert
A 38 inch electric fireplace insert fills the clear opening of a traditional masonry firebox almost exactly, which is why it is the size most period homes end up with.
Measure the back of the opening as carefully as the front. A 38 inch electric fireplace insert needs the same width at the rear, and older fireboxes taper more than owners expect. Where the taper is more than an inch, a 38 inch electric fireplace insert is still the closest fit available without rebuilding.
Who a 38 inch electric fireplace insert suits
It suits anyone who wants a working fire without rebuilding the surround. A 38 inch electric fireplace insert leaves the brick returns and the hearth untouched, so the room keeps its history and gains a fire.
Delivery, returns and the two things people ask about
Everything ships from our own yard, tracked, in 2 to 5 business days. Shipping is a flat $50 under $1,000 and free over $1,000, with a $150 minimum order. We will not promise a delivery window we cannot hold, and if a carrier loses a unit we replace it rather than sending you to a claims form.
Returns run 30 days on unopened units. Keep the carton for a week after delivery, because a transit scuff is far easier to resolve while the packaging still exists. Photograph the glass in daylight before you recycle anything.
Two questions come up on almost every order. The first is whether the heater can run without the flame, and it cannot: the flame is the light source for the fire and it stays on whenever heat is on. The second is whether the flame can run without the heater, and it can, all year, which is how most owners use these units from spring onwards.
How it compares to the rest of the range
For a larger open-plan wall, the 72 inch electric fireplace fills it properly. For a smaller room, the 50 inch version suits better than squeezing a 60 into a short wall.
The Ember Peak standard
Every fire we ship is bench-tested before it leaves the yard. We inspect the flame with the heater off, check the thermostat, and test the cord and plug, because a fireplace that arrives with a rattle is one you resent for years.
Delivery arrives tracked within 2 to 5 business days. Shipping is a flat $50 under $1,000 and free over $1,000, with a $150 minimum order. Anything unclear before or after the sale reaches a human on the contact page, and we will tell you when a different model suits your opening better.
Compare the full range on the electric fireplace inserts page, or read our sizing guide before you commit.
Common questions
Will it fit a 36 inch opening?
No, the body needs 38.5 inches of clear width.
Does it need a surround?
Only if the opening is wider than the insert.
Is 42 inches better?
Only if the opening is deep and wide enough to take it.
Does it heat the room?
5,200 BTU, 400 to 600 square feet.
Can I keep the grate?
Yes, in front of the glass.
What sizes does it come in?
We stock it in 38 inch, 42 inch. All sizes share the same body height, so choosing one is a decision about width.
Does it include a remote and timer?
Yes. The box includes a remote, an adjustable thermostat, a 1–9 hour timer and the fixings.
If you are replacing an open fire or a gas fire that no longer works, this 38 inch electric fireplace insert is the least disruptive route back to a working hearth. Nothing structural changes, nothing needs sweeping, and the whole job takes under an hour.
Every unit ships from our own yard rather than a third-party warehouse, which is why we can tell you honestly what fits your corner and what does not. We would rather talk you out of the wrong size than sell you one and post you a returns label.
Order the Fenwick 38 Inch Electric Fireplace Insert today. It ships in 2 to 5 business days with tracking, and orders over $1,000 ship free.
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