# How Much Gas Does a Patio Heater Use?

Gas patio heaters offer users comfort and warmth all year round, but you may be asking yourself – **Just how much will it cost to run my patio heater?**

*Fear not,* it’s fairly easy to calculate the consumption and output of a modern day gas patio heater with simple math.

## How Long Does a Gas Bottle Last in a Heater?

We’ve done the math for heaters ranging from 3000W to 15000W based on different tank sizes for you below so you don’t have to.

**The result is number of hours usage per tank based on full power!**

3.9kg | 4.5kg | 5kg | 6kg | 7kg | 13kg | 15kg | 19kg | 47kg | |

3000W | 15.60 | 18.00 | 20.00 | 24.00 | 28.00 | 52.00 | 60.00 | 76.00 | 188.00 |

4000W | 11.70 | 13.50 | 15.00 | 18.00 | 21.00 | 39.00 | 45.00 | 57.00 | 141.00 |

5000W | 9.36 | 10.80 | 12.00 | 14.40 | 16.80 | 31.20 | 36.00 | 45.60 | 112.80 |

6000W | 7.80 | 9.00 | 10.00 | 12.00 | 14.00 | 26.00 | 30.00 | 38.00 | 94.00 |

7000W | 6.69 | 7.71 | 8.57 | 10.29 | 12.00 | 22.29 | 25.71 | 32.57 | 80.57 |

8000W | 5.85 | 6.75 | 7.50 | 9.00 | 10.50 | 19.50 | 22.50 | 28.50 | 70.50 |

9000W | 5.20 | 6.00 | 6.67 | 8.00 | 9.33 | 17.33 | 20.00 | 25.33 | 62.67 |

10000W | 4.68 | 5.40 | 6.00 | 7.20 | 8.40 | 15.60 | 18.00 | 22.80 | 56.40 |

11000W | 4.25 | 4.91 | 5.45 | 6.55 | 7.64 | 14.18 | 16.36 | 20.73 | 51.27 |

12000W | 3.90 | 4.50 | 5.00 | 6.00 | 7.00 | 13.00 | 15.00 | 19.00 | 47.00 |

13000W | 3.60 | 4.15 | 4.62 | 5.54 | 6.46 | 12.00 | 13.85 | 17.54 | 43.38 |

14000W | 3.34 | 3.86 | 4.29 | 5.14 | 6.00 | 11.14 | 12.86 | 16.29 | 40.29 |

15000W | 3.12 | 3.60 | 4.00 | 4.80 | 5.60 | 10.40 | 12.00 | 15.20 | 37.60 |

## How Much Gas Does a Patio Heater Use?

The average modern day *“efficient”* patio heater will use **approximately 1kg of gas (propane/lpg) per 12kW of power**.

So to calculate how much gas you’ll use you need to use the following formula.

X = Gas Tank Size

Y = Wattage

Z = 12000

**(X / (Y/Z)) or (12kg / (3000W/12000W)) = 48**

**Based on a 3000W table top patio heater & a 12kg tank of gas costing £33**

12000W =

1kg(1kg of usage per 12000W per hour)

3000W / 12000W=0.25kg(3000W usage per hour)12kg divided by 0.25kg

= 48hours per 12kg tank of gas

**Based on a 15000W patio heater & a 12kg tank of gas costing £33
**

12000W =

1kg(1kg of usage per 12000W per hour)

12000W (1kg) + 3000W (0.25kg) =1.25kg(15000W usage per hour)12kg divided by 1.25kg =

9.6 hours per 12kg tank of gas

## How Much Does it Cost to Run a Gas Patio Heater?

To calculate the cost we need to use the same formula as above, but **divide the cost of the tank, by the number of hours in the tank. **

This isn’t an exact science as you won’t necessarily be running your patio heater on full power all the time. So if you find you’re using your heater at half power for the most part, simply divide the hourly cost by 2!

**Based on a 3000W table top patio heater & a 12kg tank of gas costing £33**

12000W =

1kg(1kg of usage per 12000W per hour)

3000W / 12000W =0.25kg(3000W usage per hour)12kg / 0.25kg

= 48hours per 12kg tank of gas£33 / 48 hours =

£0.6875 per hourHalf power? = £0.6875 / 2 =

£0.34 per hour

**Based on a 15000W patio heater & a 12kg tank of gas costing £33
**

12000W =

1kg(1kg of usage per 12000W per hour)

12000W (1kg) + 3000W (0.25kg) =1.25kg(15000W usage per hour)12kg divided by 1.25kg =

9.6 hours per 12kg tank of gas£33 / 9.6 hours =

£3.4375 per hour

As you can see the price varies greatly depending on consumption. Gas heaters are substantially more expensive than electric heaters (with electric being up to two thirds CHEAPER to run). We’ve written a more comprehensive article on how much it costs to run a patio heater, which compares the price differences and savings for both commercial and home users in detail.

If you have any comments or queries please leave them below and we’ll get back to you as soon as possible!