Rinnai FC824N Vent-Free Fan Convector Heater, Natural Gas, 24,000 BTU
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The Rinnai FC824N is an FC Series vent-free fan convector that runs on natural gas with an input range of 8,400 to 24,000 BTU/h. It is a practical way to add supplemental heat to basements, sunrooms and room additions that the main system struggles to reach.
Because it needs no flue or ductwork, almost none of the heat leaves the room, giving a rated 99.9% efficiency. Ignition is direct electronic, the gas inlet is a 1/2 in. FNPT connection, and onboard self-diagnostics help a technician pinpoint faults quickly. Safety protection stays active at all times: a tilt switch, flame and power failure shutoff, and an oxygen depletion sensor that keeps watching room air. The cabinet stays cool to the touch. Professional installation is recommended, and actual heating area depends on climate and where the unit is placed in the home.
Highlights
Input range of 8,400 to 24,000 BTU/h on natural gas
Vent-free design rated 99.9% efficient with no flue or ducts
Oxygen depletion sensor, tilt switch, and flame and power failure protection
Cool-to-the-touch cabinet and onboard self-diagnostics
Direct electronic ignition with a 1/2 in. FNPT gas connection
Specifications
Brand | Rinnai |
Model | FC824N |
Input | 8,400-24,000 BTU/h |
Fuel | Natural gas |
Venting | Vent-free |
Ignition | Direct electronic |
Gas connection | 1/2 in. FNPT |
Efficiency | 99.9% |
Wi-Fi | No |
Series | FC Series |
Height | 19.00 in. |
Width | 24.00 in. |
Depth | 9.40 in. |
Weight | 33.0 lb |
Good to know
Gas-fired appliance: it must be installed, vented and commissioned by a qualified installer in line with local codes and the manufacturer's installation manual.

