Modern Flames Redstone 42 Inch Built-In Electric Fireplace Firebox Insert
Images & size shown are for reference only: colors may vary by screen, lighting, & natural material variation. See description for dimensions & finish options or call us to request a sample if an exact match is needed.
Modern Flames Redstone 42 Inch Built-In Electric Fireplace Firebox Insert - 42 Inches is backordered and will ship as soon as it is back in stock.
Choose with help from our Maspeth showroom. Read customer reviews on Google.
Pickup available at Maspeth, NY Showroom
Usually ready in 2-4 days
- Northeast shipping. Eligible orders over $999 ship free within our 11-state area; other eligible orders have a flat rate at checkout. Product exclusions apply. Shipping details.
- Factory-authorized Modern Flames dealer. You keep the full manufacturer warranty.
- 30-day returns, no restocking fee.
- Professional installation available across NYC, Long Island, Westchester, northern NJ and Greenwich/Stamford, CT.
Maspeth, NY 11378
- Monday–Friday
- 9:00 AM–5:00 PM
- Saturday
- 10:00 AM–3:00 PM
- Sunday
- Closed
Call ahead to confirm the model you want to see and pickup readiness.
Shipping & Delivery Area
Shipping & Delivery Area
- Online shipping is limited to Maine, Vermont, New York, New Hampshire, Massachusetts, Connecticut, Pennsylvania, New Jersey, Maryland, Delaware and Rhode Island.
- Eligible orders over $999 receive free standard shipping; eligible orders of $999 or less have a flat rate shown at checkout.
- Our own trucks deliver eligible local orders up to 120 miles. e-NRG fuel, white-glove delivery and assembly have separate eligibility, distance limits and charges.
- For other states, or when no delivery option appears, call 718-326-4328 for a quote before ordering.
- Read the shipping policy for details.
Assembly & Installation
Assembly & Installation
Our company installs in the following areas: Manhattan, Queens, Brooklyn, Nassau, Suffolk, Staten Island, Bronx, & Westchester NY. Hudson, Union, Essex, & Bergen NJ. Greenwich & Stamford, CT. Check out our portfolio of projects we built!
WE OFFER INSTALLATION FOR THE PRODUCTS WE SELL BELOW
- Outdoor Kitchens
- Outdoor Fireplaces/Firepits
- Outdoor Pizza Ovens
- Gas Fireplaces
- Gas Inserts
- Gas Log Sets
- Fireplace Doors
- Fireplace Mantels
- Electric Fireplaces
- Water Vapor Fireplaces
- Ethanol Fireplaces
Call for a free quote 718-326-4328
Warranty
Warranty
Manufacturer's warranty their products only if they are purchased from an authorized retailer like us. If an issue occurs and the item was purchased from a 3rd party website i.e. Amazon, your claim may be denied. What this means for you as a customer? As a factory authorized & trained dealer for every brand on our website, you will maintain full manufacturer's warranty. Please click on the manufacturer's manual in the description for full warranty coverage information.
Returns
Returns
- No-Restock Fees
- 30-Day Return Policy
- The NYC Fireplaces Team wants you to love what it is that you've ordered! If for some reason you have an issue with your product, we offer a '30-Day Return Policy'.
- We allow returns on all new, unused, unassembled, and "resalable" items in their original packaging within 30 days of the delivery date for a refund (minus the original shipping costs, and the shipping costs you incur shipping the product back). Naturally, if your return is because of our error, you are not responsible for any shipping costs.
Modern Flames Redstone 42 Inch Built-In Electric Fireplace Firebox Insert - 42 Inches is backordered and will ship as soon as it is back in stock.
Description
Description
Overall Dimensions: 39-3/4 in. W x 27 in. H x 9-7/8 in. D with 5/8 in. trim; finished opening 38-3/4 x 26-3/4 x 10 in.
The Modern Flames Redstone 42 (RS-4229) is a built-in electric firebox for a new framed wall or an existing fireplace opening, with Modern Flames' Hybrid-FX flame, a log set and acrylic crystal ember bed. It plugs into a standard 120V outlet and heats with up to 1,465 watts, about 5,000 BTU.
It suits a traditional room where you want the look of a wood fireplace without venting or gas, with independently controlled flame color, up lighting and down lighting and a thermostat-controlled heater.
Features
- Hybrid-FX flame technology (per listing)
- 10 flame colors with independently controlled up and down lighting (per listing)
- Log set with acrylic crystal ember bed
- Two heat settings, 733 W and 1,465 W, with thermostat; heater can be switched off
- 120V plug-in, 1,465 W, about 5,000 BTU
- For a framed wall or an existing fireplace opening
- Finish trim included (per listing)
- Remote that can be installed below a TV (per listing)
Key Specifications
| Model | RS-4229 |
|---|---|
| Type | Built-in electric fireplace or insert |
| Power | 120V 60Hz, 1,465 W (5,000 BTU) |
| Circuit | Dedicated 15 A (or higher) breaker |
| Media | Log set with acrylic ember bed |
| Controls | Touch controls and remote, thermostat, timer 30 min to 8 hours |
| UPC | 696447348302 |
Dimensions and Opening
| Overall with 5/8 in. trim | 39-3/4 in. W x 27 in. H x 9-7/8 in. D |
|---|---|
| Overall with 1-5/8 in. trim | 41-3/4 in. W x 29 in. H |
| Firebox body | 38-1/2 in. W x 26-5/8 in. H x 9-1/4 in. D |
| Finished opening | 38-3/4 in. W x 26-3/4 in. H x 10 in. D |
| Power cord | 70-7/8 in. |



What Is Included and What You Will Need
- Included: RS-4229 firebox with log set, ember media, trim and remote, per the owner's manual and listing
- Required: a dedicated 110 to 120V, 15 A grounded outlet or hardwired circuit
- Required: a finished opening of 38-3/4 x 26-3/4 x 10 in. in a framed wall, or an existing fireplace opening
- Note: Modern Flames lists its optional trim kits for the Redstone 26, 30 and 36 only; no optional trim kit is available for the RS-4229
Installation Notes
Build the finished opening at 38-3/4 in. wide, 26-3/4 in. high and 10 in. deep, provide a dedicated 15 A (or higher) circuit, then slide the fireplace in, level it on its feet and secure it with the four screws, per the Redstone owner's manual. Do not plug other appliances into the same circuit. Electric fireplaces need no venting or gas, which makes them a practical choice for New York City apartments. Book a design consultation to plan the wall, power and finish.
Documentation
Frequently Asked Questions
Can it go in my existing fireplace?
Yes. Modern Flames rates the Redstone for a new framed wall or as an insert in an existing fireplace opening; it needs a 38-3/4 x 26-3/4 x 10 in. opening.
How much heat does it make?
Up to 1,465 watts, about 5,000 BTU, on a 120V circuit.
Does it need a dedicated circuit?
Yes. The manual calls for a dedicated 15 A or higher breaker.
Can I run the flame without heat?
Yes. Heater setting H0 turns the heater and blower off; the heater only runs when the flame is on.
Related reading: Electric Fireplace Buying Guide and Best Fireplace for an NYC Apartment.
Warranty
Modern Flames limited warranty (2022-2023 policy): 5 years from date of purchase when the owner registers the product at modernflames.com, otherwise the standard 2-year warranty; integrated screens 1 year; labor credit 1 year from purchase. Coverage requires purchase from an authorized Modern Flames dealer, is not transferable, and Modern Flames must be contacted first to troubleshoot.
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Make sure this model fits your project
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1. Confirm fit
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2. Match the fuel and connections
Confirm the exact model’s fuel type, electrical requirements and any venting or ventilation requirements.
3. Complete the setup
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Questions to settle before you order
How do I know which size and configuration to order?
Have your dimensions, photos, fuel or power details and preferred model ready. Contact our showroom before ordering if fit or compatibility is unclear. Follow the manufacturer’s installation instructions.
Does the price include everything I need?
Check the product description and selected configuration for included parts. Venting, trim, surrounds, covers, carts, fuel and installation may be separate. Ask for a complete quote before purchasing.
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Delivery and installation depend on your address and the product. Review our shipping policy and call for an installation quote. Confirm availability and timing before booking work. Read shipping details. Read return terms.
Product, accessory and installation prices are separate unless the offer explicitly includes them. Compatibility must be confirmed for the exact model.






















