This compact Energy Gas Insert is perfect for heating smaller living areas. Regency quality is evident in every detail - from high efficiency heat to custom styling. The E21 features the dancing flames of an exceptional Regency fire.
Backed by the industry’s most comprehensive Limited Lifetime Warranty.
| Specifications | NG | LP |
| Maximum BTU | 23,500 | 22,500 |
| Turn Down BTU | 11,750 | 11,250 |
| Efficiency | 77.00% | 77.00% |
| EnerGuide Rating | 50.60% | 53.48% |
| View Area | 318 sq. in. | |
| Room Size | Small | |
| Vent Type | B-Vent | |
| Min. Fireplace Opening* | |
| Width (front) | 26.5" |
| Width (back) | 18" |
| Height | 17.75" |
| Depth | 14" |
*Regency Contour Faceplate or Full Screen Door
How it Looks:
- Efficient upgrade to keep the heat in your home
- The look of a wood fireplace with the convenience of gas
- Heat radiating ceramic glass provides maximum viewing area
- Realistic logs with beautiful flames and platinum infused bright embers
How it Works:
- Whisper quiet variable speed blower to push the heat
- Controllable heat with up to 50% flame turn down
- Easy access waist height controls
- B-vent application is ideal for older homes
- Operates on natural gas or propane
The following accessories are available for this product. You can also design your own fireplace with the Fireplace Design Center.
Blower
- Variable Speed

Hearth Trim
- Black Trim (1", 2", 4" or 6")

Zero Clearance Kit
- For Installing into New Construction

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Brochure
Product Specification
Owner & Installation Manual