Touchstone Sideline Infinity Pro 72" Review: a three-sided smart fireplace for modern builds

The Touchstone Sideline Infinity Pro 3-Sided Smart 72" is clearly aimed at people building a feature wall or full renovation, not someone looking for a quick plug-and-play heater. On paper, you’re getting a large, 72-inch, three-sided electric fireplace with WiFi, Alexa compatibility, crackle sound, and a 1,500W heater rated for about 400 sq. ft. It sits in the higher end of the electric fireplace market, but several Amazon buyers say they compared it against showroom units that cost much more and still went with this one.

What stands out is the combination of size and flexibility: four installation options (fully three-sided, left- or right-visible, or front-only), plug-in or hardwire power, and a bunch of visual customization (6 flame colors, 13 ember and downlight colors, multiple speeds and intensities). According to the comments, most people use it as a design centerpiece in living rooms or open-plan spaces, often building a false wall around it.

With a 4.5/5 average over roughly 80 ratings, feedback is mostly positive. Buyers often highlight the flame realism compared to cheaper brands, and the fact that the app/Alexa control actually works reliably once paired. There are, however, a few criticisms: one repeated point is the lack of a full panel lock when the unit is off, which some parents see as a safety and comfort issue with kids around.

In my opinion, this fireplace is interesting if you care more about looks, ambiance and smart-home integration than raw heating power. The heater output (about 5,120 BTU) is fine as supplemental heat for a medium room, but it won’t replace a primary system. If you’re ready to plan your framing carefully and want a long, modern linear look with side glass, it seems to line up well with that brief. If you just want cheap heat, there are simpler options.

The exact price isn’t shown here, but from the context and brand, the Sideline Infinity Pro 72" clearly sits in the mid-to-upper range of electric fireplaces, especially compared to the many generic inserts on Amazon. Several reviews mention that they compared it to units in high-end fireplace showrooms that cost more than double, and still felt this Touchstone model looked better or at least comparable, which is a strong sign that the perceived value is decent.

What you’re paying for is not just heat. You’re paying for:

• a 72" three-sided glass design with four installation options,
• a fairly realistic flame system with a lot of customization,
• WiFi and Alexa integration via Tuya,
• a built-in crackle sound speaker,
• brand support and a limited warranty.

If you only care about heating a room cheaply, a basic 1,500W space heater or a simpler flat-front electric fireplace will do the job for far less money. But if you’re investing in a media wall or feature wall, the cost of framing, drywall, and finishes usually dwarfs the difference between a cheap insert and a better one. In that context, spending more on a unit that looks good and has smart features can actually make sense.

On the downside, there is at least one pointed criticism: a parent notes that the lack of a full panel lock when the unit is off is a big negative for them, because a child can still turn the unit on from the front glass. For households with young kids, that might reduce the perceived value, since you’re paying for a premium product but missing a control feature that some ovens and other appliances already have. In my opinion, for someone doing a renovation and wanting a modern, long, three-sided look, this fireplace offers good but not bargain value. For renters or people who don’t care about side glass or smart control, it’s probably overkill.

The main selling point of this model is its three-sided glass design on a 72-inch length. Instead of the usual flat front-only electric insert, you can expose the left and right sides, which buyers say draws a lot of attention and feels closer to some high-end gas linear fireplaces. According to several reviews, people often build a false wall or custom media wall around it, so this isn’t just a heater; it’s meant to be the visual anchor of the room.

Touchstone gives you four installation configurations: fully three-sided, left-visible, right-visible, or front-only. This is useful if your framing or room layout doesn’t allow for both sides to be open. On paper, that flexibility is a strong point compared to many competitors that are locked into a single front-only orientation. The depth of 9.25" is fairly typical for a built-in electric unit, but it still means you need enough wall depth or a bump-out.

Visually, the unit is finished in black alloy steel, with clean lines and a minimalist style. The internal bed can be customized with either driftwood logs or crushed glass crystals, and combined with different flame and downlight colors. Reviews frequently highlight how realistic the basic warm flame looks when set to the standard red/orange tone with lower brightness, while some of the more colorful modes are described as more decorative or “fake looking,” which is expected—they’re mainly for mood lighting, not realism.

One practical detail: the control panel is a touchscreen strip on the glass. It looks sleek, but it does mean the controls are easily accessible to kids, which one parent in the reviews strongly criticizes. In my opinion, the design hits the modern, linear fireplace trend nicely and gives a lot of visual customization, but you need to be comfortable planning the framing and accepting that the glass touch controls are always reachable at the front.

The Sideline Infinity Pro uses alloy steel for the main body, with a black finish and three glass viewing panes. At 95 pounds, it’s not a flimsy unit; the weight suggests a fairly substantial chassis and glass thickness typical of this size of electric fireplace. Buyers who comment on build quality often describe it as solid and well put together, with one calling it “gorgeous and well made,” and another mentioning that installation and assembly were straightforward, which usually hints at decent manufacturing tolerances and fit.

Inside, the visual components include painted crushed glass crystals and driftwood-style logs. These are purely decorative, but they matter a lot for perceived quality because they’re what you stare at all day. Reviews say the included media looks good and helps the flames appear more realistic, especially when you choose the more natural color settings. You can mix and match logs and glass depending on whether you prefer a more traditional or modern look.

A more unusual material-related feature is the built-in crackle speaker system. Instead of relying on the heater fan noise alone, the fireplace has an integrated audio feature that simulates the crackling of a real fire. Volume is adjustable. While there aren’t a ton of detailed comments about this in the public reviews, the spec suggests it’s meant to add another layer of realism without you having to run a separate speaker or app in the background. For people who like background sound, this is a nice extra.

From a safety and durability standpoint, the unit is vent-free and lists overheat protection as a special feature, which is standard but important. In my opinion, nothing on the spec sheet screams cutting-edge materials; it looks like a solid, conventional alloy-steel-and-glass build with some thoughtful extras. The overall impression from buyers is that it feels like a higher-end product than many cheaper Amazon fireplaces, especially in how the glass sides and internal media look once installed.

Durability on an electric fireplace comes down to a few things: the quality of the heating element and fan, the LED/flame system, the electronics (WiFi, remote receiver, touchscreen), and the overall body and glass. The Sideline Infinity Pro doesn’t list any exotic durability claims, but it does come from a known brand (Touchstone) with a limited warranty, and the 4.5/5 average rating over several dozen reviews suggests no widespread failure pattern so far.

Most comments that touch on long-term use are positive but relatively short. One owner mentions leaving the unit running visually 24/7 (without heat) because of the low electrical draw for the LED flames, which indirectly suggests that at least in that case the flame system handles continuous operation without immediate issues. Others highlight that the fireplace feels solid and well built after installation, and no one in the visible reviews reports cracked glass, rattling parts, or immediate breakdowns, which you do sometimes see with cheaper brands.

On the electronics side, the WiFi and Tuya integration appear to be reliable once paired, with only initial setup hiccups mentioned. The remote uses two AAA batteries, a simple and easily replaceable choice. The unit also lists overheat protection, which is key for both safety and component life, as it should shut the heater down if it gets too hot. That said, like any 1,500W space heater, you should still be careful about ventilation and not blocking air intakes.

In my opinion, with the current amount of feedback, the fireplace looks reassuring but not bulletproof by reputation. There isn’t enough long-term data to say it’s flawless over many years, but there also isn’t a wave of complaints about early failures. Given the price bracket and the brand, I’d expect it to outlast ultra-budget units, especially if installed correctly and not abused. If durability is a top priority, confirming the exact warranty terms and keeping proof of professional installation (if you hardwire it) would be smart.

On paper, the Sideline Infinity Pro 72" is built more for ambiance plus supplemental heat than for whole-house heating. The 1,500W heater (with a 750W lower setting) and 5,120 BTU output are typical for this category and should be enough to take the chill off a 400 sq. ft. room, especially if your home is reasonably insulated. It also includes an adjustable thermostat from 68–88°F and a timer from 30 minutes to 9 hours, which gives you some control over how and when it runs.

Where it stands out compared to many budget units is the flame and lighting system. You get 6 flame colors and 5 flame speeds and intensities, plus a 13-color ember bed and 13-color down lighting. Several Amazon buyers make a point of saying the main warm-colored flame looks close to a gas fireplace, especially with brightness dimmed, and that this was a key reason they preferred it over cheaper alternatives whose flames looked obviously artificial. The more exotic colors are seen as fun but less realistic, which is normal.

The smart features also get positive mentions. The unit integrates with the Tuya Smart app for WiFi control and then links to Alexa. One review notes that pairing took a couple of tries but then worked fine, and Alexa picked up the device automatically once it was in Tuya. After setup, buyers say it’s easy to cycle through ember colors, flame colors, height, speed, and heat from the app or by voice. This puts it ahead of many no-name fireplaces that only offer a basic remote.

In my opinion, the performance is solid for what this is supposed to be: a visually flexible, smart, supplemental heater. If you expect it to replace a furnace, you’ll be disappointed; if you want realistic-enough flames, a bit of heat, and convenient control from the couch or your phone, it seems to deliver. The only notable operational complaint is about the lack of a full panel lock when the unit is off, which affects comfort and peace of mind more than raw performance.

The Sideline Infinity Pro 72" is a built-in, vent-free, electric fireplace insert measuring 72" wide, 17.25" high, and 9.25" deep, with a listed weight of about 95 pounds. It’s rated at 1,500W (with a 750W low setting) and about 5,120 BTU of supplemental heat, with Touchstone stating coverage up to roughly 400 sq. ft. It’s designed to be either plugged into a standard 3-prong outlet or hardwired, which gives some flexibility depending on how serious your build-out is.

Functionally, the unit is quite loaded. You get 6 flame color options, 5 flame speeds and intensities, a 13-color ember bed with several predefined levels plus a pulsating mode, and 13-color down lighting from the top of the box. It ships with both driftwood-style logs and painted crushed glass crystals, so you can go for a more traditional log look or a more contemporary glass bed. There is also a built-in crackle speaker system for simulated fire sound, with adjustable volume.

On the control side, the fireplace supports WiFi via the Tuya Smart app and is compatible with Alexa once linked. According to multiple reviews, you can turn it on/off, change colors, adjust brightness, set timers, and control heat from your phone or by voice. Physically, you also get a touchscreen on the front glass and a standard remote control (2 AAA batteries). The thermostat is adjustable from 68–88°F, and there’s a programmable timer from 30 minutes up to 9 hours.

In my opinion, the spec sheet targets homeowners who want a feature-rich, smart, linear fireplace rather than a barebones heater. The price point (not listed here but clearly not budget) aligns more with a renovation piece than a casual purchase. If you value lots of visual options and app control, it lines up well; if you want simple, manual controls and don’t care about colored flames, this may feel over-equipped for your needs.