No brand name on a vent-free fireplace tells you whether that unit is safe, legal or supported. The names you will see most, including Pleasant Hearth, Empire, Monessen, ProCom and Duluth Forge, sit behind different companies with very different support footprints, and on September 11, 2026 several of those brands’ own web addresses were not working as support sites. Check the same five things for every brand: the listing on the rating plate, the manual for your exact model, a working parts and support channel, the fuel, and whether the unit may be sold and installed where you live.
Brand comes after two bigger questions: whether a vent-free appliance is legal where you live, and whether it suits your household, which our honest answer on vent-free safety works through.
This page ranks nothing and recommends no brand. We have not used, installed or tested any of these products, and the page carries no affiliate links. What follows is what each company’s own website showed when we checked it on September 11, 2026. Websites change, so treat every line here as dated.
Carbon monoxide: the brand does not change the burner’s physics
Every vent-free unit, whoever made it, burns gas in the room and keeps its combustion products there. The CPSC’s Carbon Monoxide Information Center calls carbon monoxide “a colorless, odorless, poisonous gas”, and the EPA’s page on carbon monoxide’s impact on indoor air quality names “unvented kerosene and gas space heaters” among indoor sources (both read September 11, 2026). A working CO alarm is a condition of running any of them, as our page on the CO alarm as a condition of use explains.
Why ventless gas fireplace brands tell you less than you think
Every unvented room heater sold for installation under the model fuel gas code has to meet the same baseline. The residential code text we read on UpCodes, section G2445 (numbered 621 in the International Fuel Gas Code) in a 2024 adoption, requires a listing to ANSI Z21.11.2, installation “in accordance with the conditions of the listing and the manufacturer’s instructions”, and an oxygen depletion safety shutoff set no lower than 18 percent oxygen (UpCodes, unvented room heaters, read September 11, 2026).
So the brand does not decide whether a unit has the core safety equipment; the listing does. What the brand does decide is whether you can get the manual, the right replacement parts and a real answer from the maker in five years’ time. That is where brands differ, and where a buyer can check.
The brands you will see, and what their own sites showed
Pleasant Hearth
GHP Group’s own website lists Pleasant Hearth among its brands, with categories for vent-free fireplaces, vent-free wall heat, vent-free stoves and gas logs, and a customer service contact (read September 11, 2026). Its product pages carry real limits: the dual-fuel Wildwood vent-free log set page says “Not for sale in California or Canada” and “Check your local regulations on installation restrictions and requirements”, and its blower page says it is “Designed and certified to only operate with Pleasant Hearth Vent Free Fireplace Systems” (GHP Group, Wildwood vent-free gas log set, read the same day).
What we could not confirm: the pleasanthearth.com address returned a security certificate error when we tried it on September 11, 2026, and several product pages we read showed items as sold out. Verify: that GHP Group supplies the manual and parts for your exact model number.
Empire Comfort Systems
Empire Comfort Systems says it offers “both American-made and imported vent-free heaters”, and lists brand families including Empire Hearth and American Hearth (read September 11, 2026). Its American Hearth site describes log sets that complement “the burner pattern for a lifelike fire” (American Hearth, read the same day). The whitemountainhearth.com address, a name you will still see on retail listings, forwarded to empirehearth.com when we checked.
What we could not confirm: the Empire Hearth site refused our reader’s request, so we have not read its vent-free product pages. Verify: whether a unit sold as White Mountain Hearth is supported by Empire today, and ask Empire directly for the manual for that model and whether it is one of the American-made or imported lines.
Monessen
Monessen’s website links to Hearth & Home Technologies as its company page and lists vent-free fireplaces, fireboxes, gas logs and inserts (read September 11, 2026). Its user guides and manuals page says all its products carry a rating plate and explains where to find it, and its product pages, such as the Lyric vent-free burner, send buyers to the owner’s and installation manual for “complete requirements, specifications, testing and listing information” (read the same day).
What we could not confirm: which of its vent-free products are offered in your area, and through which dealers. Verify: that a local dealer or technician services Monessen vent-free units, and download the manual before buying.
Real Fyre (Robert H. Peterson Co.)
RH Peterson describes itself as making gas logs and fire products under several brand names including Real Fyre, and says its brands’ websites carry “catalogs and manuals, product specifications” (read September 11, 2026). What we could not confirm: the realfyre.com address redirected in a way our reader could not follow, so we have not read its vent-free pages. Verify: whether the specific set is vented or vent-free, from its rating plate and manual, because a log brand can make both.
ProCom
ProCom-branded vent-free units, including thermostat-controlled inserts and stoves, still appear in major retailers’ listings in search results we checked on September 11, 2026. On the same day, the procomheating.com address redirected to a page offering that domain for sale. We do not know what that means for the company, and we are not suggesting anything about it. What it does mean for a buyer is that the brand’s own website was not available to supply a manual or parts information when we looked. Verify: who currently supplies the manual, warranty service and replacement parts for the model, and get that in writing from the seller.
Duluth Forge
Duluth Forge-branded vent-free units also appear in retail listings. On September 11, 2026, duluthforge.com showed a placeholder that read “Our store will be opening soon”, with no product, manual or support information. Verify: the same as for ProCom, before you buy.
Other names on retail pages
Retailer collections in the search results we checked also list Napoleon, Superior, Kingsman, Majestic, Buck Stove and others. We did not check those makers’ own sites for this page, and we have not confirmed which of them currently sell vent-free models in the United States. Apply the same checks.
Five checks that apply to every brand
| Check | Why it matters | Where to find it |
|---|---|---|
| The listing | The code requires ANSI Z21.11.2 for vent-free units | The rating plate, and the manual |
| The manual for the exact model | Installation must follow it, and it holds the log diagram, ODS details and fuel | The maker’s website or the seller, before you pay |
| A live support and parts channel | The pilot and ODS assembly must be replaced with listed parts | The maker’s own website and phone line, not only the retailer |
| The fuel | Natural gas and propane units are not interchangeable without a listed kit and a licensed technician | The rating plate |
| Where it may be sold and installed | Some makers restrict sale by state or country, and local codes vary | The product page, the manual and your building department |
Our guide to choosing a ventless gas fireplace puts these checks in the order that wastes the least money, and our local code check covers the last row.
Warning signs, whatever the brand
- The seller cannot show you the rating plate or a manual for the exact model.
- The brand’s own website is gone, parked or empty, and the seller cannot name who supports the product.
- Replacement parts are sold as fitting “all” vent-free units.
- The product page and the manual disagree about where the unit may be sold.
- Anyone offers to install it without a licensed professional.
Installation is licensed work
Whatever the brand, connecting the gas supply, converting fuel and servicing the pilot and ODS assembly are jobs for a licensed gas fitter or a qualified hearth technician, under the permit and inspection your jurisdiction requires. We publish no installation procedure. A technician who services your brand locally is worth more than any brand name.
What we checked, and when
All read or attempted on September 11, 2026: GHP Group home page and Pleasant Hearth product pages; Empire Comfort Systems home page; American Hearth home page; the whitemountainhearth.com redirect; Monessen home page, user guides and manuals page and Lyric product page; RH Peterson home page; the procomheating.com, duluthforge.com, pleasanthearth.com, empirehearth.com and realfyre.com addresses; residential fuel gas code section G2445 (IFGC 621), as published on UpCodes in a 2024 adoption; CPSC Carbon Monoxide Information Center; EPA, Carbon Monoxide’s Impact on Indoor Air Quality; search results for this keyword. Company websites and ownership change often, so recheck before you buy.
Frequently asked questions
What is the best ventless gas fireplace brand?
We do not rank brands, and a brand name does not decide safety. Every vent-free unit must be listed to ANSI Z21.11.2 and carry an oxygen depletion shutoff. What differs is support: a manual you can get, parts you can buy and a technician near you who services it.
Who makes Pleasant Hearth vent-free fireplaces?
GHP Group’s own website lists Pleasant Hearth as one of its brands, with vent-free fireplaces, wall heaters, stoves and gas logs. Confirm the manual and parts for your model with GHP Group.
Is White Mountain Hearth the same as Empire?
When we checked on September 11, 2026, the whitemountainhearth.com address forwarded to Empire Hearth’s website, and Empire Comfort Systems lists Empire Hearth among its brands. Ask Empire to confirm support for the specific model before you buy.
What if a brand’s website is gone?
Treat it as a support question you need answered before you pay. Ask the seller who supplies the manual, warranty service and listed replacement parts, and get the answer in writing.
The bottom line
Buy the listing, the manual and the support, not the logo. Check each of the five points for the exact model in front of you, confirm the brand’s own support channel still exists, and keep a working CO alarm in the house whichever name is on the plate.