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Redstone 42" Built-in Electric Fireplace Insert - An electric fireplace display featuring realistic glowing logs with vibrant flames and glowing embers, set in a sleek black frame.

Modern Flames Redstone 42" Built-in Electric Fireplace Insert

by Modern Flames
SKU RS-4229

FREE Shipping + No Sales Tax

$1,699.00
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Modern Flames Redstone 42" Built-in Insert

  • Hybrid-FX™ Flame Technology: High-intensity RGB LEDs create ultra-realistic, independently controlled flames, ember bed, and downlight colors — giving your room the warmth and ambiance of a real fire without any of the mess.
  • 10 Customizable Color Options: Choose from 10 flame, 10 ember bed, and 10 downlight color combinations so you can perfectly match your mood, décor, or season at the touch of a button.
  • Heats Up to 400 Sq. Ft.: With 5,000 BTUs and two heat settings, this insert efficiently warms small to mid-sized rooms, making it an ideal zone-heating solution that can lower your overall energy costs.
  • Safe to Mount TV Above: Forward heat projection means no heat rises toward your TV or mantel, so you can confidently install this fireplace beneath your television without worry.
  • No Venting, Easy DIY Install: Designed to slide into existing zero-clearance fireplaces or a standard 10-inch wall cavity, this insert requires no venting, no gas lines, and no special construction — just plug in and enjoy.
  • Flame-Only Year-Round Mode: Run the flame display without any heat output, so you can enjoy the cozy ambiance of a flickering fire even during warm summer months.
Specifications
Electrical
  • Voltage: 120V
  • Dedicated Breaker Required: 15A or higher
  • High Heat Setting: 1,465W
  • Low Heat Setting: 750W
  • Heat Output: 5,000 BTUs
  • Coverage Area: Up to 400 sq. ft.
Flame & Controls
  • Flame Technology: Hybrid-FX™ with high-intensity RGB LED lights
  • Flame Color Options: 10
  • Controls: Touch panel and remote control
  • Sleep Timer: 30 minutes to 8 hours
  • Sound Level: ~40 dB (quiet operation)
General
  • Dimensions: 27" H × 39 3/4" W × 9 7/8" D
  • Viewing Area: 24" H × 38 1/2" W
  • Installation Depth Required: 10 inches
  • Installation Type: Built-in insert — fits existing zero-clearance fireplaces or 10" wall cavity
  • Venting Required: No

Redstone 42" Built-in Electric Fireplace Insert

Transform your space instantly with the Modern Flames Redstone 42" Built-in Electric Fireplace Insert, the perfect upgrade for old or unused fireplaces.

This modern insert combines classic charm with cutting-edge performance, featuring Hybrid-FX™ Flame Technology for ultra-realistic, customizable flames. You can easily personalize your ambiance with 10 flame, ember bed, and downlight color options, all controlled via touch panel or remote.

Designed for simplicity, it slides right into an existing fireplace or can be installed into a 10-inch wall cavity—a great DIY project. With 5,000 BTUs of heat, it warms up to 400 sq. ft., making it ideal for small to mid-sized rooms.

Best of all, it’s a vent-free, low-maintenance solution for enjoying fireplace comfort and style year-round.

Redstone 42" Built-in Electric Fireplace Insert Features

  • A safer, cleaner alternative to gas fireplaces
  • Built-in or clean face installation to match any décor
  • Safe under TVs – no upward heat emission
  • No venting required, making setup simple
  • 10 flame, 10 ember bed, and 10 downlight color options for a customizable look
  • Hybrid-FX™ flame technology with high-intensity RGB LED lights for ultra-realistic flames
  • Energy-efficient LED technology helps save on electricity
  • Variable flame and heat with thermostat to automatically regulate room temperature
  • Flame-only mode for year-round enjoyment
  • Sleep timer (30 mins – 8 hrs.) for worry-free operation
  • Two heat settings: 1465W (High) & 750W (Low)
  • Includes clear crystal media, log set, and finish trim kit
  • Remote and touch button controls for convenience
  • DIY-friendly installation with easy instructions
  • Quiet operation at ~40 dB
  • Covers up to 400 sq. ft. with 5,000 BTUs of supplemental heat

SPECS:

  • Power: 120V, requires dedicated 15A (or higher) breaker
  • Dimensions: 27" H × 39 3/4" W × 9 7/8" D
  • Viewing Area: 24" H × 38 1/2" W
  • Heat Output: 5,000 BTUs
  • Certification: UL Listed
  • Warranty: 1-Year Limited

What's Included:

  • 1 × Electric Fireplace
  • 1 × Remote Control
  • 1 × Bag of Glass Media
  • 1 × Log Set
  • 2 × Trim Kits
  • 1 × User’s Manual
Installation
  • Built-In Insert — Fits Existing Zero-Clearance Fireplaces or 10" Wall Cavity Installation
Downloads & Resources

Every order ships free to any address in the contiguous United States — no minimums, no fine print.

Your order ships via FedEx or UPS — delivered to your door within 3–7 business days.

Why Electric Fireplaces USA?

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Authorized Modern Flames Dealer
Full manufacturer warranty honored on every purchase. Direct relationship with Modern Flames — not a grey-market reseller.
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Call (877) 429-3322 and speak with a specialist who knows electric fireplaces inside and out. Free advice, no pressure, no scripts.
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Free shipping on every order to the contiguous US — no minimums, no hidden charges.
30-Day Returns
Return any uninstalled item in original condition within 30 days for a full refund.
Post-Purchase Support
Here after delivery too — warranty questions, part lookups, installation guidance, and more.
Have a question? We're here to help.
📞 (877) 429-3322

Frequently Asked Questions

  • The Redstone 42-inch can be installed in two ways: it slides directly into an existing zero-clearance wood-burning fireplace, or it requires 10 to 12 inches of wall depth for a built-in flush-mount look. It can be plugged into a standard outlet or hardwired, and two trim kits (5/8-inch and 1 5/8-inch) are included for a seamless, polished finish.

  • The Redstone 42-inch includes a fan-forced heater rated at 5,000 BTUs with two settings — 1,465 watts on high and 750 watts on low — capable of providing supplemental zone heating for spaces up to 400 square feet. A built-in thermostat automatically maintains your desired temperature between 68°F and 88°F, and the flames can also be used without heat for year-round ambiance.

  • Yes, the Redstone 42-inch is designed to be TV-friendly because it emits no heat upward, making it safe to mount a television directly above the unit. This ventless electric design requires no chimney, gas line, or venting, giving you flexible placement options anywhere in your home.

  • The Redstone 42-inch features Hybrid-FX™ flame technology with 10 flame color options, 10 ember bed color options, and 10 downlight colors that are all independently controllable. It offers three customizable flame patterns with adjustable brightness and speed, and comes with both a touch-screen control panel and a handheld remote — plus a sleep timer settable from 30 minutes to 8 hours.

  • The Modern Flames Redstone 42-inch is backed by a manufacturer's limited warranty covering defects for 24 months from the date of purchase. In the box, you'll find the electric fireplace unit, a remote control, acrylic crystal glass media, a driftwood log set, both trim kits, and a user's manual — with optional accessories like TruWood Logs and Cannon Balls available separately.