Heatilator EC36 Fireplace Doors — Custom Exact-Fit Replacement
First, Confirm You Have an EC36
The Heatilator EC36 is a 36-inch heat-circulating, wood-burning prefab fireplace from the E & EC Series, built by Hearth & Home Technologies and installed in homes roughly from the mid-1980s through the mid-2000s. You can recognize an EC-series unit by the upper and lower grille panels (louvers) above and below the opening — those move room air around the firebox. The radiant sibling, the E36, shares the same firebox opening, and the EC36I is simply the insulated version of the same fireplace.
To confirm your model, find the metal rating plate. On these units it is inside the firebox — typically riveted to a side wall of the firebox, or visible when you look behind the lower louver panel. Use a flashlight; after decades of fires the tag is often soot-darkened but still legible. If it reads E36, E36I, EC36, or EC36I, everything on this page applies to your fireplace.
Why You Can't Just Buy the Original Doors Anymore
Heatilator offered factory glass door kits for this series — the DM1036 and DP1036 cabinet-style doors, plus the arched DMA1036. Those kits have long been discontinued, and stock at distributors dried up years ago. Meanwhile the fireplaces themselves keep working fine, which is why so many EC36 owners end up searching for replacement doors today.
The tempting shortcut — a universal or masonry fireplace door from a big-box store — doesn't work here, for three reasons:
- Prefab fireplaces need an inside-fit door. A masonry door overlaps the brick face around the opening. On a prefab like the EC36 there is no masonry face to overlap — the door frame has to sit inside the metal opening and mount to the firebox itself.
- The louvers must stay clear. The EC36 is a heat-circulating design. A door that covers the upper or lower grilles chokes off the airflow the fireplace was engineered around, and blocks the fan kit if one is installed.
- The listing matters. These fireplaces are tested and listed to UL safety standards as a system. A door that clamps, screws, or seals in ways the firebox was never tested for can compromise that listing — and your insurance position along with it.
In short: the EC36 needs a door made for its exact opening and mounting style, and the factory no longer makes one.
Our Answer: Doors Built to the 1/8 Inch
ExceptionalFire builds custom replacement doors for prefab fireplaces, including the Heatilator E and EC Series. Each door is fabricated to your measurements — to the 1/8" — with an inside-fit frame designed for zero-clearance fireboxes, so it mounts cleanly without blocking louvers or modifying the fireplace.
Getting there takes two short steps:
- Identify your fireplace in about 15 seconds. Snap a photo of your fireplace and the rating plate and send it to our AI Fireplace Expert. It matches the model and tells you exactly which door style and mounting your unit takes.
- Configure and price it instantly. Head to our prefab door collection, enter your measurements, pick frame finish, glass, and handles, and the configurator shows your price on the spot — no waiting for a quote.
Measuring the EC36 Opening
For E36/EC36 fireplaces, the opening is commonly listed at 36" wide by 20 15/16" tall. Treat that as a starting point, not gospel: refractory panels, hearth height, and how the surround was finished all shift the real numbers slightly from one installation to the next, and a custom door is only as good as the measurements behind it.
Measure the width in three places (top, middle, bottom) and the height in three places (left, center, right), and record the smallest of each. Our step-by-step measuring guide walks you through it with photos — it takes about five minutes with a tape measure.
What Not to Do with EC36 Doors
| Don't do this | Why |
|---|---|
| Burn wood with tempered-glass doors fully closed | Standard prefab doors use tempered glass. Keep the doors open while a fire is burning; close them only as the fire dies down or when the fireplace is cold, to stop heated room air escaping up the flue. |
| Cover or block the upper/lower louvers | The EC36's heat-circulating airflow (and optional fan kit) depends on them. Blocked grilles mean overheating and lost heat output. |
| Force a masonry (overlap-fit) door onto the prefab face | It won't seat properly, can warp the metal face, and isn't how the fireplace was tested and listed. |
| Order doors from the model number alone | Openings vary slightly per installation. Two minutes of measuring beats an ill-fitting door every time. |
| Drill or modify the firebox to make a wrong-size door fit | Modifying a listed firebox can void its certification. An exact-fit door needs no improvisation. |
Frequently Asked Questions
Will fireplace doors made for a Heatilator E36 fit my EC36?
Yes. The E36 (radiant) and EC36 (heat-circulating) share the same firebox opening, so a door sized for one fits the other. The same goes for the insulated E36I and EC36I variants — just confirm the model on the rating plate and measure your actual opening.
What size fireplace doors does a Heatilator EC36 take?
The opening is commonly listed at 36" x 20 15/16", but real-world openings vary with refractory panels and finish work. Measure your own opening with our guide before ordering — our doors are built to your numbers, not a catalog average.
Can I close the glass doors on my EC36 while a fire is burning?
No. With standard tempered-glass prefab doors, burn with the doors open and the screen closed. Closed tempered doors during an active fire risk thermal breakage. Close the doors when the fire is out or down to embers to keep warm room air from escaping up the chimney.
My rating plate says EC36I — is that a different fireplace?
No, the "I" simply marks the insulated version of the EC36. The opening and door mounting are the same, so any door configured for the EC36 fits the EC36I.
Ready for Doors That Actually Fit?
Configure your Heatilator EC36 doors online in minutes and see your price instantly in the prefab door collection — or send a photo to the AI Fireplace Expert and let it do the identifying. Prefer a human? Our fireplace specialists are available 7 days a week to talk through your project before you order.