What you get
The Monessen ACUF36-BD Vent-Free Gas Fireplace is a vent-free gas fireplace rated by its maker at 40,000 BTU per hour.
At full fire it burns about 39 cubic feet of natural gas an hour (its 40,000 BTU/h divided by EIA's heat content for each fuel).
Vent-free means no pipe: combustion air comes from the room and the exhaust stays in it. The manual's room-size and altitude limits and its oxygen-depletion sensor are part of using it safely; check local code first. Vent-free vs direct-vent.
The figures, from the maker
Each figure is the maker's or the listing's own, with its source marked. A figure the maker doesn't give is shown as not stated.
| Model number | ACUF36-BD | Retailer |
|---|---|---|
| Heat output (maker) | 40,000 BTU/h | Retailer |
| Venting | Vent Free | Retailer |
| Blower | Optional Blower | Retailer |
Is it the right heater for the room?
Pick it when
- Supplemental heat for one room
- Homes with gas or propane
Pass on it when
- Bedrooms and small rooms the manual excludes
- Places where local code bans vent-free heaters
Where it wins, where it gives ground
Wins
- 40,000 BTU/h
- No chimney needed
Gives ground
- Adds moisture to the room
- Restricted by some local codes
- Needs a gas line
Know before you install
- Figures are the maker's own and are rated in the maker's conditions. Installation, venting, chimney, gas and electrical work follow the manual and local code, carried out by a qualified installer.
Heaters to weigh against it
Other gas stoves, fireplaces and inserts in the same heat range
Buying this model
The button opens this exact model's listing. Prices and stock change, and installation parts are usually sold separately; check the box contents and the manual's venting list before you order.
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Questions about this model
How much gas does the Monessen ACUF36-BD Vent-Free Gas Fireplace use?
Does the Monessen ACUF36-BD Vent-Free Gas Fireplace need a vent or chimney?
Bottom line
Pick it for supplemental heat for one room.