How Much Propane Does A 40000 BTU Heater Use?
How Much Propane Does A 40000 BTU Heater Use? A typical 40,000 BTU patio heater will cost about $1.70 per hour to use. A 20 lb Propane tank holds approximately 430,000 BTUs of liquid Propane. If a heater has a BTU capacity of 40,000 BTUs per hour, the Propane tank will last approximately 10.75 hours