All models of the Mr. Heater Buddy series use propane fuel to provide radiant heat. As of September 2015, Mr. Heater sells four regular models in the Buddy series,
The Little Buddy heater connects to a 1-pound propane canister and heats up to 100 square feet of space. The Portable Buddy, Hunting Buddy and Limited Edition Muddy Girl heaters connect to either 1-pound canisters or exterior propane supplies with hoses and heats areas of up to 200 square feet. The largest Buddy heater, the Big Buddy, uses two 1-pound canisters or an exterior supply and heats up to a 400 square foot space.