Propane Heaters Indoors

propane
A flammable hydrocarbon gas of the alkane series, present in natural gas and used as bottled fuel
This page provides supplementary chemical data on Propane.
colorless gas found in natural gas and petroleum; used as a fuel
Propane is a three-carbon alkane, normally a gas, but compressible to a transportable liquid. It is derived from other petroleum products during oil or natural gas processing. It is commonly used as a fuel for engines, oxy-gas torches, barbecues, portable stoves and residential central heating.

heaters
A person or thing that heats, in particular a device for warming the air or water
(heater) device that heats water or supplies warmth to a room
A conductor used for indirect heating of the cathode of a thermionic tube
(heater) fastball: (baseball) a pitch thrown with maximum velocity; "he swung late on the fastball"; "he showed batters nothing but smoke"
A fastball
A heater is object that emits heat or causes another body to achieve a higher temperature. In a household or domestic setting, heaters are usually appliances whose purpose is to generate heating (i.e. warmth). Heaters exists for all states of matter, including solids, liquids and gases.

indoors
indoor(a): located, suited for, or taking place within a building; "indoor activities for a rainy day"; "an indoor pool"
A house is a home, building or structure that is a dwelling or place for habitation by human beings. The term includes many kinds of dwellings ranging from rudimentary huts of nomadic tribes to free standing individual structures.Schoenauer, Norbert (2000). 6,000 Years of Housing (rev. ed.
Into or within a building
inside: within a building; "in winter we play inside"