To measure for an electric fireplace insert, determine the width, height, and depth of your existing fireplace opening, ensuring to account for any additional clearance needed for proper ventilation and installation.
Installing an electric fireplace insert requires precise measurements for a perfect fit. Unlike traditional fireplaces, electric inserts need exact dimensions to ensure proper installation, heat distribution, and aesthetic appeal. This guide covers everything from measuring techniques to BTU calculations.
Why Accurate Measurements Matter
Electric fireplace inserts must fit snugly within your existing firebox. Incorrect measurements can lead to poor heat retention, installation issues, or even safety hazards. Proper sizing ensures optimal performance and energy efficiency.
Tools You’ll Need
- Tape measure (preferably laser for accuracy)
- Notepad and pen
- Flashlight
- Level (for checking surfaces)
Step-by-Step Measuring Process
1. Measure the Firebox Opening
Start with the width (left to right) at both the front opening and back of the firebox. Record the smallest measurement. Most inserts require 1/2″ to 1″ clearance on each side.
2. Determine the Height
Measure from the firebox floor to the top at both front and back positions. If your fireplace has a lintel (metal bar across the top), add 1/8″ to your measurement for clearance.
3. Check the Depth
Measure from the front opening to the back wall. Electric inserts typically need less depth than gas or wood units, but proper clearance is still essential.
| Measurement | Where to Measure | Special Considerations |
|---|---|---|
| Width | Front opening and back wall | Use smallest measurement |
| Height | Floor to top (front and back) | Account for lintel if present |
| Depth | Opening to back wall | Center measurement most accurate |
Special Considerations
Arched Openings
For arched fireplaces, measure the highest and lowest points. Choose the smallest dimension to ensure your insert will fit through the narrowest part of the opening.
Mantel Clearance
The mantel should be at least 12 inches above the fireplace opening. For electric inserts, check manufacturer specifications – some require less clearance than traditional fireplaces. Learn more about proper mantel height for electric fireplaces.
Calculating Heating Needs
Electric fireplace inserts are rated in BTUs (British Thermal Units). To determine the right size:
- Calculate room square footage (length × width)
- Multiply by 20 (standard BTU per sq ft)
- Adjust for room characteristics:
- Add 10% for rooms with high ceilings
- Add 10-20% for poorly insulated spaces
- Subtract 10% for well-insulated rooms
BTU Guidelines by Room Size
- Under 150 sq ft: 5,000 BTUs (small bedrooms, offices)
- 150-450 sq ft: 6,000-10,000 BTUs (living rooms, master bedrooms)
- 450-1200 sq ft: 12,000-23,000 BTUs (great rooms, open concept areas)
Electrical Requirements
Most electric fireplace inserts require:
- 120V outlet (standard household)
- 15-20 amp dedicated circuit for larger units
- Proper grounding
Consult an electrician if you need to install a new outlet. Some models offer hardwired installation options for a cleaner look.
Common Measuring Mistakes
1. Ignoring Clearance Requirements
Even electric inserts need proper airflow. Always check manufacturer specifications for required clearances around the unit.
2. Measuring Only Once
Fireboxes often taper or have irregular shapes. Take multiple measurements at different points to account for variations.
3. Forgetting About the Plug
Account for the power cord location and length when positioning your insert. Some models have right-angle plugs to save space.
Choosing the Right Insert
Beyond measurements, consider these factors:
Style Options
- Traditional log sets
- Modern glass media
- Stone or pebble designs
Features
- Adjustable flame brightness
- Thermostat control
- Remote operation
- Timer functions
For more information on electric fireplace features, see our guide on understanding electric fireplace controls.
Installation Tips
Most electric inserts are designed for DIY installation:
- Clean the firebox thoroughly
- Test fit the insert before final placement
- Use included brackets or mounting hardware
- Ensure proper ventilation around the unit
- Route cords neatly and safely
For complex installations or older fireplaces, consult a professional. Some situations may require modifications to the existing fireplace structure.
Maintenance Considerations
Properly sized electric fireplace inserts require minimal maintenance:
- Dust the exterior regularly
- Clean glass with appropriate cleaner
- Check electrical connections annually
- Inspect for any signs of wear
Following these measuring guidelines will ensure you select the perfect electric fireplace insert for your space, providing years of efficient heating and aesthetic enjoyment.
