Rinnai EX08C Wall Furnace

The Rinnai EX08C Wall Furnace weighs 46 lbs. and offers 83 percent propane efficiency. The furnace has 120 AC volts and 42 watts of power. The 7-stage modulating gas valve has a variable speed blower. The noise level of the furnace is between 27 to 36 decibels, and the temperature ranges from 60 to 80 degrees and is adjustable in 2-degree increments. Safety features include a child safety lock and a self-diagnostic error code indicator. As of 2010, the cost of the Rinnai wall furnace is about $1,500 and comes with a five-year parts and two-year labor warranty.

Williams 5009621 Wall Furnace

The Williams 5009621 Wall Furnace has 50,000 BTUs and a matchless pilot igniter, along with an automatic thermostat, vent limit safety switch and powder coat finish. This model can heat up two rooms and features a blower system that pulls air from the ceiling, heats it and pushes out at floor level. Safety controls are located on the heater to prevent any dangerous malfunctions from occurring. An optional accessory includes a wireless 4-button remote control with an LCD screen. In 2010, the price of the heater is $720.

Empire Gravity Vented Wall Furnace

The Empire Gravity Vented Wall Furnace features 35,000 BTUs and uses propane to heat the furnace without electricity. The furnace has a safety switch and is designed to heat medium-size rooms. An automatic built-in shutoff feature prevents the heater from getting too warm and causing safety concerns. An additional option includes an internal blower to add circulation and heat to a room. As of 2010, the cost of the heater is $573, and it comes with a one-year parts warranty.