The Enviro EF3Bi Insert

The Enviro EF3Bi insert and zero clearance fireplace is equipped with a double row heavy duty heat exchanger and a large convection fan for efficient heat transfer around the home.

The Enviro EF3Bi insert has been around for a long time, with a good reputation for reliability.

The bay window design provides a good view of the fire..

This insert is simple and easy to maintain. It has a long burn time on the low heat setting.

Standard features are gold louvres, and a brick effect firebox liner.

If you are unsure of the meanings of the terms in the pellet stove review below,or their implications, please go to the Pellet Stove Reviews page for an explanation.

enviro ef3bi insert

Heating Area 1,800 sq.ft.

Max. Heat Output 40,000 btu.

Automatic Ignition Yes

Manual Ignition If needed

Hopper Capacity 55 lbs.

Burn time Over 55 hrs.

Fuel Type Standard or premium grade wood pellets

Glass Air Wash No

Built in Blower Yes

Convection Blower Capacity 160 cfm.

Thermostat Compatible No

E.P.A. Approved Yes

Emissions 1.96 gr. / hr.

Efficiency 78%


Height 22.9 in. zero clearance fireplace 24.6 in.
Depth 11 in. behind surround, 13 in. on hearth

Min. Fireplace Size

Height 23 in.
Width 22 in.
Depth 12 in.

Insert Surround Dimensions

Small 30 in. by 40 in.
Medium 33 in. by 46 in.

Weight 240 lbs.

Window Size 19 in. by 8 in.

Flue Vent Size 3 in.

Top Vent No

Rear Vent Yes

Rear Vent Height 9 in. insert, 10.75 in zero clearance

Battery Backup No See Stove Sentry

Surge Protector Recommended

Colours Black

Exhaust Temperature Sensor Yes

Low Draft Shutdown Yes

Construction Type Fabricated steel

Automatic Shutdown and Re-ignition No


Limited Lifetime Original purchaser. Covers the body of the insert or stove against material or workmanship defects for parts repair or replacement for seven years, labour for two years. Firebox, Heat Exchanger, Burn Pot, Firebox Panels, Ceramic Glass, Pedestals, Panels, Legs, Log Sets and Door Assembly.

Limited Three Year Warranty: Burn pot liner.

Limited Two Year Warranty: Ignitor, Auger Motor, Circuit Board, Timers, Temperature Sensors, Blowers, Vacuum Switch and Wire Harness.

Limited One Year Warranty: Exterior surface finishes against defects in materials and workmanship.


Nickel or Gold door cover

Nickel or Gold Trivet

Log set

Oversize surround

Zero clearance kit


The Enviro EF3Bi insert is an inexpensive, reliable pellet fireplace with a good heat output.

This unit has a smaller ash pan than the freestanding stove which will have to be emptied more often.

Although a zero clearance fireplace doesn't need a fireplace and chimney, a false chimney breast will have to be built to accommodate the back of the unit. This doesn't need to be the full height of the wall.

The exhaust pots are easy to access and clean.


Every Two Three Days:

Inspect burn pot, clean the burn pot liner, clean out air holes.
Check the door latch, making sure it closes securely.
Clean the window glass as needed.

Inside the firebox, ash may be removed from behind the steel plates by rotating the circular cover to allow vacuuming behind the plates.

Empty the ash pan.

Operate the heat exchanger cleaning rod.


Check the door gaskets, re-glue if necessary.

Twice a Year

Make sure that the fresh air intake is clear.
Check and clean fly ash from the stove's exhaust passageways.
Remove the firebox backing and clean the back of the stove.


Check and clean the exhaust flue every year or after burning two tons of pellets. Vacuum dust from the blowers and lubricate the convection blower.


If you would like to leave a review of the Enviro EF3Bi insert, please use the form on the contact page.

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