What you get
The Duluth Forge FDF400T-ZC-R Gas Fireplace Insert is a gas insert that its maker rates at 32,000 BTU per hour and says heats up to 1,500 square feet.
Treat the 1,500 square feet as the maker's best case for an open, reasonably insulated space, and check it against your room before choosing.
At full fire it burns about 31 cubic feet of natural gas or about 0.35 gallons of propane an hour (its 32,000 BTU/h divided by EIA's heat content for each fuel).
As a vented unit it sends its exhaust outside through the vent system its manual lists, so it leaves room air alone; the vent route has to suit the house.
Fuel, per the listing: dual fuel. Never connect a gas heater to a fuel it isn't set for.
Also on the listing: overall dimensions of 15 in (D) x 29 in (W) x 29 in (H) and ceramic construction.
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 | FDF400T-ZC-R | Retailer |
|---|---|---|
| Power | Gas Powered | Retailer |
| Dimensions (seller) | 15"D x 29"W x 29"H | Retailer |
| Material | Ceramic | Retailer |
| Mounting / installation | Built In | Retailer |
| Heat output (maker) | 32,000 BTU/h | Retailer |
| Features (seller) | Adjustable Thermostat | Retailer |
| Model name | FDF400T-ZC-R | Retailer |
| Heats up to (maker) | 1,500 sq ft | Retailer |
| Venting | Ventless | Retailer |
| Fuel | dual fuel | Retailer |
| Thermostat | Thermostat | Retailer |
Is it the right heater for the room?
Pick it when
- Clean-venting room heat
- Homes with gas or propane
Pass on it when
- Homes without a vent route
- Homes without gas or propane
Where it wins, where it gives ground
Wins
- 32,000 BTU/h
- Exhaust vented outside
- dual fuel
Gives ground
- Needs a vent route
- 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
- Duluth Forge DF300L Dual-Fuel Vent-Free Gas Fireplace
- ProCom FS100T-3AS Dual-Fuel Vent-Free Gas Fireplace
- Pleasant Hearth PHZC42F Vent-Free Gas Fireplace
- ProCom PCS150T-3AS Dual-Fuel Vent-Free Gas Fireplace
Every gas stoves, fireplaces and inserts on one chart · All Duluth Forge models listed
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 Duluth Forge FDF400T-ZC-R Gas Fireplace Insert use?
Does the Duluth Forge FDF400T-ZC-R Gas Fireplace Insert need a vent or chimney?
Bottom line
Pick it for clean-venting room heat.