Common Electric Fireplace Buying Mistakes and How to Avoid Them

Last reviewed: September 8, 2026

Most electric fireplace buying mistakes happen before anyone compares brands. They come from skipping a measurement, choosing a model before choosing an installation type, or assuming the wall behind the fireplace can support it electrically. Each one is cheap to avoid beforehand and expensive to fix afterward.

Mistake	What it costs	How to avoid it
Not measuring wall depth	Framing a bump-out after delivery	Compare the unit's required depth to your actual cavity
Model before installation type	Wasted shortlisting	Decide built-in, wall-mounted, or insert first
Not confirming the circuit	An electrician mid-project	Check amperage and what else shares the circuit
Sizing to the room, not the wall	A fireplace that looks wrong	Measure the wall or console width
Expecting furnace-level heat	Disappointment after install	Read the spec sheet, plan for supplemental heat
Buying from the product photo	A finish that does not match the room	Compare flame technology, not styling

Not measuring wall depth

Wall depth is the measurement most often skipped, and it is the one that turns a simple installation into a construction project. A standard interior wall framed with 2x4 studs gives roughly 3.5 inches of usable cavity, while many built-in electric fireplaces need considerably more.

In practice, this is the problem we hear about most often after the fact. Someone chooses a deep built-in unit, then finds they have around six inches of clearance where the fireplace needs twelve. The fix is building the wall out: framing, drywall, and finish work that was never in the plan, and that changes how the finished wall sits in the room.

Before ordering any recessed or built-in unit, find the required depth on the spec sheet rather than the product photos, measure your actual cavity depth accounting for studs and anything running inside the wall, and if the numbers do not match, decide whether you are building out or choosing a shallower model. Shallow-depth built-ins exist for exactly this situation, and picking one at the start costs nothing extra.

Choosing the model before the installation type

Installation type constrains the model list far more than brand or price does, so deciding it first eliminates most of the catalog immediately. Doing it in the other order means shortlisting units that were never viable for your wall.

There are four options and they solve different problems. A wall-mounted fireplace hangs on the surface with no framing and usually plugs into a standard outlet. A built-in sits inside a framed cavity for a flush finish, and needs framing, drywall, and usually an electrician. An insert drops into an existing masonry or prefabricated firebox, where the opening decides the size for you. A fireplace suite needs no installation beyond an outlet.

Answer one question before anything else: are you building this into a wall, mounting it on a wall, or fitting it into an existing opening? Our comparison of built-in vs wall mounted electric fireplaces covers the tradeoff in detail.

Not confirming the circuit

A 1,500 watt electric fireplace draws 12.5 amps, which is more than a 15-amp circuit should carry continuously. This is the detail that most often stalls an installation, because it surfaces after the wall is already framed.

The National Electrical Code treats a heater running three hours or more as a continuous load, and Article 210.23 limits a continuous load to 80 percent of the circuit rating. That means 12 amps on a 15-amp circuit and 16 amps on a 20-amp circuit. A 1,500 watt fireplace therefore wants a 20-amp circuit, ideally a dedicated one.

The questions worth answering before you order are what circuit serves that wall, whether it is already shared with other rooms, and whether the panel has room for another one. Buyers who work that out first rarely have installation problems. Our plug-in vs hardwired comparison covers when hardwiring becomes necessary, and the installation cost guide covers what adding a circuit typically runs.

Sizing to the room instead of the wall

Fireplace width should be judged against the wall or media console it sits on, not the square footage of the room. Common design guidance puts the unit at roughly half to two-thirds of that width, and undersizing is the more frequent error.

A small fireplace on a wide, empty wall reads as unfinished, particularly under a large television. The same unit on a narrower wall can look exactly right. This is why two people with identically sized rooms can need different fireplaces.

If a TV is going above the unit, the fireplace should generally be at least as wide as the screen. Our size guide breaks this down by band, and mounting a TV above an electric fireplace covers the height relationship.

Expecting furnace-level heat

Electric fireplaces are supplemental heaters, and buying one as a primary heat source leads to disappointment regardless of brand or price. Heat output is listed on every manufacturer spec sheet in watts and BTU per hour, and it varies more between models than most shoppers expect.

Width is not a proxy for warmth either. A wider fireplace does not necessarily produce more heat than a narrower one, because the heater is a separate component from the flame display. Check the figure for the specific model rather than assuming a category standard.

If heat is genuinely the priority rather than appearance, that changes which units make sense. Our room-by-room heating guide covers what to expect by room size.

Buying from the product photo

Flame realism is produced three different ways, and the method matters more than how the unit looks in a styled photograph. Product images are shot in ideal lighting and rarely tell you which technology is inside.

LED flame projection is the most common and the least expensive. Layered LED with an independently lit ember bed adds depth and sits in the mid and premium range. Water vapor uses ultrasonic mist lit from below, producing flames you can pass your hand through, and needs a reservoir refilled periodically.

Price differences between these approaches are significant, and so is the visual result. If realism is your deciding factor, compare the water vapor collection against conventional LED units before judging on appearance alone. Our guide to the best electric fireplace brands covers which brands lead on which technology.

If this were my house

I would settle the wall before looking at a single product. Measure the width, measure the depth, find out what circuit is behind it. Then decide built-in, wall-mounted, or insert. Only then start comparing models.

Done in that order, most of the catalog eliminates itself and the remaining choice is about appearance and budget, which are the enjoyable parts. Done in the other order, you find out about the six inches of clearance after the fireplace has already shipped.

Frequently asked questions

What is the biggest electric fireplace buying mistake?

Ordering a built-in unit without measuring the wall cavity depth is the most expensive mistake, because the fix is framing a bump-out after the fireplace has already arrived. A standard 2x4 interior wall provides only about 3.5 inches of usable depth, and many built-ins need considerably more. Check the required depth on the spec sheet before ordering, not the product photos.

Should I choose the brand or the size first?

Choose the installation type first, then the size, then the brand. Installation type eliminates most of the catalog immediately, since a unit designed for a framed cavity will not work on a surface mount. Once you know the format and the width your wall supports, comparing brands becomes a question of flame technology and finish rather than fit.

Do I need an electrician for an electric fireplace?

Plug-in wall-mounted units generally need no electrician, provided the outlet is on a circuit that can carry the load. Hardwired and built-in units almost always do, and a 1,500 watt unit should be on a dedicated 20-amp circuit under NEC Article 210.23. The deciding factor is the circuit rather than the fireplace, so check what serves that wall before you plan the installation.

Can an electric fireplace heat a whole room?

An electric fireplace can meaningfully warm a small to medium room, but it is designed as a supplemental heater rather than a primary heat source. Output varies by model and is listed in watts and BTU per hour on the spec sheet. Buying one expecting furnace-level performance is a common source of disappointment, and it is not a problem that a more expensive model solves.

What size fireplace looks right under a TV?

The fireplace should generally be at least as wide as the television above it, and often slightly wider. A narrow unit under a large screen reads as unfinished on a wide wall. Measure the wall rather than the room, since the same fireplace can look balanced in one space and undersized in another.

Is a more expensive electric fireplace always better?

Higher-priced electric fireplaces buy better flame technology, build quality, larger formats, and more installation flexibility, but not necessarily more heat. If the fireplace is a design centerpiece in a media wall, the premium tiers show their value. If it is a supplemental heater in a bedroom, an entry-tier unit may suit the room just as well. Our guide on whether premium electric fireplaces are worth it covers where the money goes.

Where to go from here

Every mistake on this list traces back to the same root: deciding on a fireplace before deciding on the wall. Measure the width, measure the depth, confirm the circuit, and the rest of the decision gets much easier.

If you are ready to narrow by format, compare built-in electric fireplaces against the wall mounted collection to see what each finished install actually looks like.