- Under $300: 6 in-stock electric fireplace inserts, from $153.99 to $281.99.
- Heat: every insert here lists supplemental heat for up to 400 sq ft, and each flame effect can run without heat.
- Existing fireplace: the 21" 3D log set sits in most open fireplaces with no installation.
Compare in-stock electric fireplace inserts under $300
18" Slim Fireplace Insert
$153.99 $219.99Save 30%
- 20 temperature settings, 62–82°F
- 3 flame intensities
- Remote + touch button, LED screen
21" 3D Log Set, Infrared
$158.99 $244.99Save 35%
- Fits most existing fireplace openings
- 3D projected flame effect
- No installation, plugs into 120V
23" Insert with Remote & Timer
$172.99 $247.99Save 30%
- 11 temperature settings, 64–82°F
- 4 flame brightness levels
- CSA/UL certified
26" Insert with Remote
$181.99 $279.99Save 35%
- Fits TV stand, cabinet or freestanding
- 4 flame brightness levels
- Remote or on-unit buttons
28" Multicolor Flame Insert
$231.99 $289.99Save 20%
- Multicolor flames, 8 brightness levels
- Brick-look interior, hand-painted logs
- Furniture, wall or floor install
23" Infrared, 4 Flame Colors
$281.99 $433.99Save 35%
- 4 flame colors, 5 ember levels
- Recessed or freestanding
- Remote + touch controls
| Model | Size | Heater | Timer | From |
|---|---|---|---|---|
| 18" Slim Fireplace Insert | 18 in | 1400W | 30 min–6 h | $153.99 |
| 21" 3D Log Set, Infrared | 21 in | 1500W infrared | 1–9 h | $158.99 |
| 23" Insert with Remote & Timer | 23 in | 1400W | 1–8 h | $172.99 |
| 26" Insert with Remote | 26 in | 1400W | 1–8 h | $181.99 |
| 28" Multicolor Flame Insert | 28 in | 1400W | 1–9 h | $231.99 |
| 23" Infrared, 4 Flame Colors | 23 in | 1500W infrared | 1–9 h | $281.99 |
How to choose
Frequently asked questions
What is the cheapest electric fireplace insert under $300 here?
The 18-inch slim insert currently has the lowest price on this page.
How large a room can these inserts heat?
Each insert on this page lists supplemental heat for up to 400 square feet. They are not a primary heat source.
Can I use the flame without heat?
Yes. Each insert on this page states that the flame effect can run with or without heat.
Which insert has multicolor flames?
The 28-inch insert has multicolor flames with 8 brightness levels; the 23-inch infrared model offers 4 flame colors.
Which insert fits an existing open fireplace?
The 21-inch 3D log set is designed to sit in most existing fireplace openings and needs no installation.
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Prices in USD for in-stock variants; crossed-out prices are the compare-at prices shown on each product page. Checked November 9, 2026; prices and stock can change, so confirm on each product page. This page compares Radeway products only. Shipping and returns: see our shipping and return policies.