Choose an electric insert when avoiding gas piping and combustion venting is the priority; choose a gas insert when you have suitable fuel, venting, and a need for higher rated heat output. The practical decision depends on the fireplace opening, electrical capacity, fuel availability, local code, and the complete installed quote—not on a blanket claim that one fuel is always cheaper or warmer.
Heat figures are model-specific. For example, Regency lists its Ei29LCD electric insert at 5,000 BTU on 120 volts (1,400 watts) or 9,500 BTU on 240 volts (2,800 watts), while the separate Regency U31 gas insert manual lists 30,000 Btu/h. Those are different products, not a controlled comparison. Use the exact model manual and sizing guidance for your room.
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Electric vs. gas at a glance
| Factor | Electric insert | Gas insert |
|---|---|---|
| Example rated heat | Regency Ei29LCD: 5,000 BTU at 120 V/1,400 W or 9,500 BTU at 240 V/2,800 W. | Regency U31 manual: 30,000 Btu/h. |
| Combustion venting | The cited Ei29LCD is described by its manufacturer as no-vent. | Requires the fuel connection and venting specified for the exact model. |
| Primary site checks | Opening dimensions, clearances, circuit capacity, voltage, and finish details. | Fuel type, gas supply, vent route, clearances, liner or chimney condition, and code. |
| Installed price evidence | No current, comparable all-in price was established. | No current, comparable all-in price was established. |
| Operating cost | Model input multiplied by your electricity tariff and actual run time. | Model input multiplied by your natural-gas or propane tariff and actual run time. |
The table is a decision framework, not a promise of room performance. Heat delivered to a room also depends on insulation, air leakage, climate, thermostat settings, appliance placement, and whether the insert is supplemental or primary heat.
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Electric output varies with voltage and model
The cited Ei29LCD has two electrical configurations: 5,000 BTU with a 120-volt, 1,400-watt input, or 9,500 BTU with a 240-volt, 2,800-watt input. A 240-volt version may require a dedicated circuit and different wiring, so do not assume an existing receptacle can support it. Confirm voltage, amperage, breaker size, plug or hard-wire requirements, and clearance rules in the current installation manual.
#1 Best Overall
- Overall dimensions: 35 1/16" W x 26 31/32" H x 8 25/32" D. Firebox dimensions: 32 1/8" W x 25 9/16" H x 7 51/64" D. Please contact before ordering if you are not sure about if it will suit your opening.
- 3 flame intensity can be used with or without heat all year long; 100% energy saving LED technology. A sleek look with three-sided interior brick wall and clean glass front trim design, without the hassle of cleaning dust or ashes.
- Life-like resin log which is 11 13/16" high sitting on the grate above ember bed, that's just what a wood burning fireplace looks like.
- Adjustable thermostat; A supplemental heat for up to 400 sq. ft. NOT a MAIN heat source; Remote control provided for easy operation.
- Easy to install and uninstall. With flat bottom, the insert can just sit on the floor directly; Plug in and use under a voltage of 120, CANNOT be hard wired. Customer service is always ready for help whenever you need.
An electric insert converts electricity to heat at the appliance, but its listed BTU figure is still a product rating rather than a guarantee that a particular room will reach a target temperature. A large, drafty room can feel under-heated even when the appliance operates normally. Ask the manufacturer or installer what room area and insulation assumptions support the model’s published guidance.
Gas ratings are also model-specific
The cited U31 gas-insert manual lists 30,000 Btu/h. That figure cannot be compared directly with the electric examples as a universal electric-versus-gas result: the products, configurations, and test conditions differ. Gas models may also have minimum and maximum input ratings, altitude adjustments, and fuel-specific requirements. Read the manual for the exact natural-gas or propane version before ordering.
Use output ratings for sizing, not marketing labels
Before selecting either type, document the room’s floor area, ceiling height, connected spaces, insulation level, window area, climate, and whether the insert will supplement another heating system. Have a qualified installer reconcile that information with the manufacturer’s sizing instructions. Oversizing can cause short cycling or uncomfortable temperatures; undersizing can leave the room cold and encourage unsafe attempts to modify the appliance.
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Electric installation requirements
- Measure the opening. Record width at the front and rear, height, depth, hearth dimensions, and any irregular masonry. Compare every dimension with the insert’s cut sheet, including required air space.
- Verify the circuit. Identify the circuit serving the proposed location, its breaker rating, conductor size, outlet position, and whether other loads share it. A 240-volt configuration may require new wiring from the panel.
- Confirm clearances and finish materials. The manual controls spacing from combustibles, mantel projections, trim, flooring, and side walls. Do not infer clearance from another model that looks similar.
- Prepare the cavity. Remove or isolate the old appliance as specified, repair masonry or framing, and provide a level, load-bearing surface. A no-vent appliance may not need a chimney connection, but the existing opening still has to meet the product’s installation instructions.
- Install and commission. Connect power as directed, secure the unit, fit the surround, test every heat and control function, and keep the manual and electrical information with the home records.
No-vent does not mean no requirements. Electrical protection, clearances, structural support, and local electrical rules still apply. A plug-in unit is not automatically safe in an undersized cavity or on an overloaded circuit.
Gas installation requirements
- Identify the fuel. Confirm natural gas or propane before purchasing. Orifices, regulators, pressures, and conversion procedures are model-specific.
- Assess the existing fireplace and chimney. The installer must determine whether the opening, hearth, smoke chamber, and chimney can accept the listed vent system. A damaged or incorrectly sized chimney can add repair or relining work.
- Plan the gas route. Verify meter or tank capacity, shutoff location, pipe sizing, sediment trap requirements, and access for service. Never run an unapproved flexible line or conceal a connection contrary to code.
- Install the specified venting. Use only the vent components, termination locations, liners, and vertical or horizontal configurations allowed by the manual. A decorative gas log arrangement is not interchangeable with a sealed insert vent system.
- Complete safety and combustion checks. The qualified installer should test gas pressure, leak-tightness, ignition, flame appearance, vent operation, carbon-monoxide protection, and any required inspection before handover.
The U31 manual is the controlling starting point for that model and references applicable gas-installation requirements. Local building, mechanical, fuel-gas, and fire codes can impose additional rules. Confirm who obtains permits and who schedules inspection before work begins.
Rank #2
- Attractive and Practical Design: 3.86"D x 60"W x 18.11"H,The thickness of the new style is only 3.86 inches while the old one is 6 inches. And it operates the same as the old one. Also we redesign the location of main power and power cable, which makes the new fireplace more attractive and practical.
- Multi Operation Modes: Touch screen and remote control;12 flame & LED flame bed color modes;5 flame speed modes;5 flame brightness levels; Specially automatic flame design(the flame color and brightness changed
- Energy Saving: 750W & 1500W modes can be adjusted accordingly for both warm and energy saving purpose. The supplemental zone heating is for up to 400 square feet.
- Safety and Comfort: ETL Certificate Approved. It also has auto-heat kill safety to avoid the superheating. The heat is good for maintaining the natural humidity within the air without making the room too dry.
- Let R.W.FLAME electric fireplace warm your home and life.
What installation costs actually include
There is no defensible national installed-price winner from the available figures. The final bill can include the appliance, demolition, masonry repair, electrical or gas work, venting, chimney work, surround fabrication, permits, inspection, delivery, and commissioning. Two homes with identical inserts can have very different totals because their openings and utilities differ.
Historic chimney-cost context
A U.S. Environmental Protection Agency FAQ gives a historic chimney-related installation range of $600–$1,200. The publication year is not established on the retrieved page, and the figure is not a current all-in price for either an electric or gas insert. Treat it only as historical context for one part of a project; do not use it as a 2026 quote.
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What current cost guidance does—and does not—say
An Angi 2026 cost guide identifies room area, desired heat output, and professional installation as cost drivers, but the available result does not establish separate, substantiated totals for electric and gas inserts. A contractor’s itemized proposal is therefore more useful than a generic online range.
Request comparable, itemized quotes
Ask each installer to price the same scope and identify exclusions. Require separate lines for:
- Insert, surround, trim, remote, and accessories.
- Removal, disposal, and preparation of the existing fireplace.
- New circuit, receptacle, disconnect, or panel work for electric.
- Gas branch line, shutoff, regulator, conversion, or propane equipment for gas.
- Chimney inspection, liner, cap, repairs, and vent components.
- Masonry, framing, hearth, mantel, drywall, painting, and finish work.
- Permit fees, inspection charges, delivery, startup, and commissioning.
- Warranty terms, service access, and the price of later maintenance.
Have the installer state assumptions about concealed damage, asbestos or lead-containing materials, chimney access, and electrical-panel capacity. Those assumptions determine whether a low initial bid is genuinely comparable.
Rank #3
- APPEARANCE: The Sideline electric fireplace is designed for recessed in-wall mounting. Creating a cozy atmosphere of a traditional fireplace, this electronic fireplace has realistic flames with a real fire look. The Sideline’s 5 flame intensity settings radiate a soft ember glow up to an intense blaze. Sideline gives you the total package. Control the heat and flame with the remote control. Designed to use one log or crystal, if you prefer you can mix both safely.
- FEATURES: The Sideline features an unmatched flame. Friends will be nervous to touch realistic flame behind the glass. The Sideline includes faux-fire logs & crystals to create an authentic feel, as well as an IR remote controlling flame color & intensity, the heater, and shut-off timer. Front facing heater vents allow you to position the Sideline just 8” under a flat screen TV. The Sideline can be hardwired or plugged in to your electric source.
How to calculate running cost in your home
Electricity calculation
Use the appliance’s input in kilowatts, multiply by hours operated, then multiply by your utility’s delivered price per kilowatt-hour:
running cost = input kW × hours of use × electricity rate per kWh
For the Ei29LCD examples, 1,400 watts is 1.4 kW and 2,800 watts is 2.8 kW. A two-hour session would therefore consume 2.8 kWh at the 120-volt configuration or 5.6 kWh at the 240-volt configuration, before applying your tariff. These are energy-use calculations, not a claim about a particular bill; taxes, demand charges, tiered rates, and thermostat cycling can change the result.
Gas calculation
Use the exact input rating, the appliance’s actual duty cycle, and your gas or propane price. For a model rated at 30,000 Btu/h, one hour at full input is 30,000 Btu. Convert the fuel’s billed units using your supplier’s stated Btu content, then apply the unit price:
running cost = fuel used × local gas or propane rate
Rank #4
- 【Wall Mount& Recessed Electric Fireplace】This electric fireplace is designed for both Wall Mounted and Recessed build in wall installation, fit for 2 x 4 and 2 x 6 Stud wall, flush mounted, to meet various home remodeling needs.Overall dimension:50’’(W) x 18.11’’(H) x 3.86’’(H); Recess Box Dimension:30.35’’(W) x 16.54’’(H) x 3.86’’(D)
- 【Ultra Thin Lightweight Design】3.86 inch thickness and 39.4lbs weight design, one person can easily hang it on the wall. With Lightweight Feature, this fireplace is also safer to mount on the wall for it takes less risk to drop out from the wall; 3.86 inch Ultra Thin fireplace box can also offered a more aesthetic sideline mounting effect which other fireplace can’t provide
- 【Realistic Flame Effect】 Amaze your guests with lifelike flames of this electric fireplace! Ultra High Intensity LED lights provide realistic flame effect:12 LED flame & crystal hearth color modes and 5 flame speed & brightness levels by Touch Screen Panel or Remote Control; Different flame settings can cater to your different desired ambience. Flame effect can be operated with or without heat for year-round ambience.
- 【Safe&Energy Saving Fireplace Heater】750W-1500W heating modes, 5100BTUS,12.5AMPS,plug-in 120v outlet, heating area up to 400sq.ft. This fireplace can be adjusted according to your preference making it a practical fixture. Using LED technology instead of gas or oil, ETL certified, save energy as this fireplace produces no messy or harmful by product, safe for both people and pets.While safety features include overheat protection and timer.
- 【Modern Home Décor Fireplace】 Fill in your big blank wall with a touch of modernity and elegance. This electric fireplace will serve as a functional décor in your bedroom, living room, office, or family room. Dual-mode function flame effects can operate with or without heat for year-round ambience; Free replacement for installation problems; Damage and missing parts within 1 year.Replace & refund within 1 month
Do not calculate from the visible flame alone. A thermostat may cycle the burner, and pilot, blower, venting, and service costs can affect ownership. Propane prices also vary more by delivery timing and tank arrangements than a simple per-unit comparison suggests.
Why local prices decide the result
The Electric Power Research Institute notes that an electric fireplace can be less expensive to operate depending on local electricity and gas prices. That means a national ranking is misleading without a location, tariff, input rating, run time, and duty cycle. Gather a recent utility bill and the manufacturer’s input data before comparing annual costs.
Fit, controls, and everyday use
Electric strengths and trade-offs
- No combustion fuel line or flue connection for a model designated no-vent.
- Usually simpler installation when the opening and circuit already comply.
- Heat output is limited by the electrical configuration and circuit capacity.
- Operation during a power outage is generally unavailable unless the home has suitable backup power.
- Controls, flame effects, fan noise, and thermostat behavior vary by model; inspect them in the manual rather than assuming they are standard.
Gas strengths and trade-offs
- Potentially higher rated heat output, illustrated by the 30,000 Btu/h U31 example.
- Requires compatible fuel, approved venting, combustion-air provisions where specified, and professional commissioning.
- Chimney or liner condition can add work before the insert is usable.
- Fuel supply, vent termination, gas pressure, and annual safety checks remain part of ownership.
- Operation may still depend on electricity for ignition, controls, or a blower, depending on the model.
Safety, permits, and maintenance
Electrical safety
- Use the specified circuit and protection; do not use an extension cord or power strip unless the manufacturer explicitly permits it.
- Keep combustibles outside every clearance zone, including rugs, trim, curtains, and mantel decorations.
- Install over-current protection and grounding exactly as required by the electrical code and manual.
- Have a licensed electrician correct warm outlets, nuisance breaker trips, aluminum-wiring concerns, or undersized conductors before installation.
Gas and carbon-monoxide safety
- Use a qualified gas-appliance installer to connect, pressure-test, and commission the unit.
- Install carbon-monoxide alarms as required by local law and the appliance instructions, and test them regularly.
- Keep the vent termination clear of windows, doors, air intakes, walkways, and snow accumulation according to the manual.
- Stop using the appliance if you smell gas, see soot, observe an unstable flame, or hear unusual combustion noise; follow the fuel supplier’s emergency procedure.
Permits and inspections
Permit rules depend on jurisdiction and the scope of work. Electrical circuits, gas piping, structural changes, chimney liners, and vent terminations may each trigger different permits. Put responsibility in writing: the contract should name the permit holder, inspection schedule, required certificates, and the remedy if work fails inspection.
A practical decision process
- Start with the site. Measure the opening and inspect the hearth, chimney, framing, and available utilities.
- Define the heating job. Decide whether you need supplemental comfort, backup heat, or a major room-heating source, then document room and building conditions.
- Shortlist compliant models. Compare only units approved for your opening, fuel, vent configuration, voltage, and clearances.
- Obtain equal-scope quotes. Give each installer the same specification and require the itemized categories listed above.
- Compare operating cost locally. Use your electricity, gas, or propane tariffs and realistic hours, not national averages.
- Verify the installer. Confirm licensing, insurance, appliance experience, permit handling, commissioning, warranty support, and service availability.
- Keep the documentation. Save the model and serial numbers, manuals, permits, inspection approvals, wiring or gas diagrams, and maintenance records.
Common mistakes and how to avoid them
Comparing unmatched BTU numbers
A 5,000-BTU electric model and a 30,000-Btu/h gas model do not prove that gas is six times better in a room. They are different products with different installation and test conditions. Compare models intended for the same space and operating role.
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Old masonry, liners, caps, and clearances may not satisfy a new gas insert. Schedule an inspection before ordering and budget for concealed defects.
Best Value
- Attractive and Practical Design:3.86"D x 50"W x 18.11"H ,The thickness of the new style is only 3.86 inches while the old one is 6 inches. And it opearates the same as the old one. Also we redesign the location of main power and power cable, which makes the new fireplace more attractive and practical.
- Multi Operation Modes:Touch screen and remote control;12 flame & LED flame bed color modes;5 flame speed modes;5 flame brightness levels; Specially automatic flame design(the flame color and brightness changed.
- Energy Saving: 750W & 1500W modes can be adjusted accordingly for both warm and energy saving purpose. The supplemental zone heating is for up to 400 square feet.
- Safety and comfort: ETL Certificate Approved. It also has auto-heat kill safety to avoid the super heating. The heat is good for maintaining the natural humidity within the air without making the room too dry.
- Let R.W.FLAME electric fireplace warm your home and life.
Treating electric as universally plug-and-play
Voltage, amperage, circuit sharing, cavity dimensions, and combustible clearances still govern installation. A 240-volt model can require substantial electrical work.
Using a generic annual-cost estimate
Without local tariffs, input ratings, run time, and cycling assumptions, an annual number is false precision. Use your own bill and the formulas above.
Accepting a vague quote
A quote that says installation included may omit permits, venting, chimney repair, finish work, or electrical upgrades. Make every inclusion and exclusion explicit before signing.
Which insert is right for your project?
Select an electric insert when your priority is avoiding fuel piping and combustion venting, the model’s rated output suits the room, and the required circuit can be provided economically. Select a gas insert when the property has suitable natural gas or propane, a compliant vent path, and a justified need for the model’s higher rated output. In both cases, the exact manual, local code, and itemized installation quote control the decision.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
