The Reznor UDX100 Power Vented Gas Fired Unit Heater is perfect for those cold winter days. This heater will keep you warm and comfortable while you're relaxing inside. The Reznor UDX100 Power Vented Gas Fired Unit Heater is easy to use and has a simple design that is perfect for any room. The Reznor UDX100 Power Vented Gas Fired Unit Heater is perfect for those cold winter days. This heater will keep you warm and comfortable while you're relaxing inside. The Reznor UDX100 Power Vented Gas Fired Unit Heater is easy to use and has a simple design that is perfect for any room.