https://www.openlearning.com/u..../dalsgaardwatson-slk
https://anotepad.com/notes/3g2fcmwj
Gas Fire Patio Heater A gas patio heater can be used to warm up a seating area, and create a comfortable environment for socializing. They can be powered by propane, natural gas, or electricity. Electric models are more portable, but emit no fumes or carbon monoxide. Propane tanks can be carried around, but need to be refilled and natural gas patio heaters connect directly to the gas line and eliminate the requirement for canisters. Saf
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