The TN40 pellet insert, built by Pacific Energy, converts an existing fireplace into a clean, low-emission pellet heater that is simple to run and easy to maintain. Digital controls give you five heat levels, an automatic igniter lights the fire for you, and the stove can run from an optional low-voltage wall thermostat. The heavy-gauge steel body has a wide firepot for a full flame, and the hopper lid slides open so you can rest a bag of pellets on it while you fill.