Rinnai's flexible, easy-to-install vent-free space heaters for indoor use with 10KBTU propane gas are the perfect solution for rooms and spaces that are hard to heat. FC510P is a room heater with an efficient heater fan, a ceramic burner, and a protective power fuse; when the 5-amp fuse blows, the heater will not operate until the 5-amp fuse is replaced. Rinnai's vent-free convectors feature fan heaters that push heat to the farthest reaches of the room, evenly warming larger spaces and maximizing cost saving. Rinnai America offers energy-efficient gas appliances that provide superior heating and hot water performance.