Kozy Heat SP41

The SP41 is rated to heat about 700–1,400 sq ft, enough for a living room or family room and the space around it. It burns up to 28,000 BTU/h on natural gas or propane and turns down to 20,000 BTU/h on natural gas and 21,000 BTU/h on propane. Kozy Heat lists its EnerGuide (P.4) efficiency at 74.05% on natural gas and 74.55% on propane, and it's approved for bedrooms.

Beyond the vent pipe and gas line, nothing else is required: Its six-piece log set and standard safety screen are included, with the screen preinstalled, so there's no front or media to buy. Optional extras are a prairie or arched prairie overlay that fits over the screen, black glass firebox panels, and a finish trim kit. The upper hood has to be installed.

The electronic-ignition SP41-L does: It includes a Proflame 2 remote with a built-in room thermostat and six flame levels, and its fan kit is standard. The standing-pilot SP41-MV is run by an on/off rocker switch and a HI/LO knob on the gas valve. For the MV, the 75 CFM fan, on/off and thermostat remotes, wall switches, and wall thermostats are optional.

Yes, but the fan won't run on either version. The millivolt SP41-MV doesn't need 120-volt power to operate, though its optional fan does. The SP41-L runs on 120 volts and can switch to its battery backup pack in an outage, which keeps the burner and flame-height adjustment working while the fan and accent light stay off.

The SP41 uses 4″ x 6-5/8″ co-axial direct-vent pipe through the roof or a wall. A vertical run can be 3 to 50 feet. Horizontal limits depend on the rise: With no rise the horizontal pipe can be only 24″ long, while a 24″ rise allows 16 feet and a 25-foot rise allows 25 feet, for 50 feet total and no more than five 90° elbows. Kozy Heat's #700-2 flexible kit is approved for horizontal terminations.

Yes. An approved kit lets it run a 4″ aluminum flex liner inside an existing Class A metal or masonry chimney of at least 7″ inside diameter, or convert to a co-linear system with 3″ x 3″ flex pipe, with 10 to 50 feet of liner either way. The chimney has to be inspected and sound first, and it can't also serve a wood-burning appliance.

Yes, with a certified conversion kit, since it leaves the factory set up for natural gas: LCK-SP41L-S30 for the electronic-ignition SP41-L or OCK-S55A for the standing-pilot SP41-MV. The SP41-L also needs the propane valve stepper motor (700-503-1), which is sold separately. Its maximum input is the same 28,000 BTU/h on propane, with a 21,000 BTU/h minimum.

Yes, where local codes don't prohibit it. The manual allows installation in an aftermarket, permanently located manufactured home (marked USA only) or mobile home. Set it on a level surface on wood or a noncombustible floor, or on a metal or wood panel the full width and depth of the unit if the floor is carpet, tile, or other combustible material.

The framed enclosure must be at least 47-1/4″ tall, 41″ wide, and 15-1/2″ deep, with 0″ to the standoffs, 1/4″ at the corners, 36″ clear in front, and 4-1/2″ to a side wall. Combustible 3/4″ trim can start 37-1/8″ above the enclosure floor and a 6″ mantel at 40-1/2″, with 1″ more depth allowed for each additional 1″ of height. The manual sets no TV clearance; it recommends a mantel to deflect heat and makes TV placement the homeowner's responsibility.