How long will a 20 lb propane tank last in a patio heater?
However, it depends on many factors, including heater efficiency, power, size, wind conditions, and usage patterns. Typically, a standard 20 lb propane tank is geared to envelop your space comfortably for 9-10 hours. In this article, let's break it down with common types of Pamapic outdoor heaters.
Here is a high-powered patio standing propane tower heater, perfect for large patios or commercial outdoor spaces. It typically produces 48,000 BTUs per hour.
The 48,000 BTU Pyramid Flame Patio Heater generates 48,000 BTU of heat (will use a 20 lb propane tank). A 20 lb propane tank contains about 430,000 BTUs of energy.
Calculation:
430,000 BTUs ÷ 48,000 BTUs/hour ≈ 9 hours of continuous use at full power
Most users don't run the heater on maximum the whole time. If you operate it at 75% power, you could stretch that to 12 hours or more.
This freestanding model patio gas heater provides slightly less heat output at 41,000 BTUs per hour, making it ideal for medium-sized patios and gatherings.
Calculation:
430,000 BTUs ÷ 41,000 BTUs/hour ≈ 10.5 hours of continuous use at full power
Running at a medium setting can easily extend runtime to 14–16 hours.
- Adjust the heat setting: Use only as much heat as you need.
- Pre-warm your space: Start on high, then lower the flame once it's warm.
- Shield from wind: Wind blows away heat and forces the heater to work harder.
- Turn it off when not in use: Even short idle periods can waste fuel.
With a standard 20 lb propane tank:
- A 48,000 BTU patio heater will run for about 9 hours on high
- A 41,000 BTU patio heater will run for about 10.5 hours on high
Knowing your expected runtime can help you plan events better and always keep your outdoor space warm and inviting.
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