How Much Does It Cost to Run a Patio Heater?

We’re all aware that the British summer can be a fickle mistress, one night it’s a scorcher, the next humid as hell and then we’re blessed with a wash-out. Fortunately with the advances in patio heater technology, you need never miss another night in the garden!

If you’re thinking about investing in a heater for the garden or patio, but you’re unsure how much it’ll cost, keep reading and we’ll breakdown the cost of running your gas or electric patio heater in detail, before you buy one!

This guide was updated on the 2nd of February 2022 to reflect the recent surge in energy prices.

The difference between gas & electric patio heaters

Most patio heaters use either gas or electricity to generate heat. Electricity is by far the cheaper and more eco-friendly of the two, as it produces up to 90% less Co2 emissions than a gas heater. It is also less noisy and consumes less energy. As a whole they’re also cheaper to buy than gas heaters.

Infrared electric heaters and halogen heaters also heat up surfaces, which makes them more efficient than gas heaters which heat up the air around them.

Gas heaters have a lower upfront cost for commercial users that need to heat a large area – however there is a diminishing cost savings when you factor in the cost of gas (LPG/Butane/Propane)

For example, you can buy a 15000W gas patio heater with a 52,000BTU output for approximately £300 + £60 gas tank. To get the same BTU from a commercial electric heater you’d need to spend closer to £1,350 on multiple heaters (a Veito Blade S2000 has 9000BTU’s on full power). So we can say that gas heaters have a lower upfront cost in terms of power output vs initial investment.

However the gas patio heater will consume approximately 1.25kg of gas per hour. This quickly eats into our initial savings.

We’ve done the calculations below for gas vs electric patio heaters.

How Much Does It Cost to Run a Patio Heater?

If you just need a rough idea on how much it costs to run your patio heater — A 2kW electric heater on full power will cost about 40pence an hour (based on an average cost of roughly 20p per kWh) while a 15kW gas patio heater costs about £3.60 an hour (based on a 13kg tank refill costing £40).

Still interested in buying a patio heater? Why not take a look at our post on the best patio heaters for this year.

Running Costs: Gas vs Electric Patio Heaters

Cost of Running a Commercial Gas Patio Heater

In this example we’re using a 15000W Firefly Samos patio heater with 52,000 BTUs.

15000W heater running costs based on a 13kg gas refill (£40):

13kg / 1.25kg = 10.4 (hours per tank)
£40 / 10.4 hours = £3.84

At full power we can expect this patio heater to cost us approximately £3.84 per hour.

15000W heater running costs based on a 19kg gas refill (£45):

19kg / 1.25 = 15.2 (hours per tank)
£42 / 15.4 hours = £2.92

At full power we can expect this patio heater to cost us approximately £2.92 per hour.

This is dependent on the size of the tank purchased. A smaller tank would cost more and inversely a larger tank would net larger savings – however most commercial heaters have limited space beneath.

This setup will provide heat for up to 25sqm

Cost of Running a Commercial Electric Patio Heater

In this example we’re using 5.7 x Veito Blade’s S2000 with a consumption of 11400W producing 52,000 BTUs.

Hourly electric heater running costs (5.7 x Veito blades 2000W vs 1 Firefly 15000W) – to achieve 52,000 BTU’s:

2kW x 1 hour = 2 kWh x 20p
(40p x 5.7) = £2.28 per hour for 52,000 BTU’s

So we can see an hourly saving of between 64p and £1.56 on an electric vs gas patio heater! But this setup will provide heat coverage for up to 142.5sqm compared to the singular gas heaters measly 25sqm!

We’d need to have these heaters running for 990 hours before seeing a saving (vs 19kg tank), but assuming conservative usage of 6 hours a day we’d break even after just 165 days. Each element is rated for 10,000 hours. So if we were to run a gas heater for 10k hours vs electric heaters for 10k hours we’d save between £9,910 and £13,110.

Gas: £360 + (10,000 hours x £3.09 – 13kg tank) = £31,160
Gas: £360 + (10,000 hours x £2.76 – 19kg tank) = £27,960

Electric: £1,350 + (10,000 hours x £1.67) = £18,050

Total cost savings over 10,000 hours vs 13kg tank – £13,110
Total cost savings over 10,000 hours vs 19kg tank – £9,910

What About Residential Patio Heaters?

Most home users won’t need a 15kw patio heater providing 52,000BTUs to heat their patio, but for the sake of fairness we’ve shown just how much you can save on an electric heater vs a gas patio heater in a commercial setting.

Home users will save even more especially on budget patio heaters.

We’ll do some quick calculations below to show you the difference in price between 2 entry level gas and electric heaters.

Fire Mountain 3000W Table-Top Patio Heater vs Oypla Electric 2000W Quartz Weatherproof Heater

Residential Gas Patio Heater Running Costs

A bottle of 13kg propane patio gas from Calor costs £32. Most modern patio heaters will use approximately 0.25kg of gas per hour at full power (3000W)

We calculate the hourly usage as follows:

3000W heater running costs:

13kg / 0.25kg = 52 hours
£40 / 52 hours = 0.77p

At full power we can expect this patio heater to cost us approximately 77p per hour.

£99.00 (heater) + £40 (gas bottle) = £139
5000 hours cost (bulb life of Oypla) = £3,100

Total cost over 5000 hours = £3,231

Home Electric Patio Heater Running Costs

2000W heater running costs:

2kW x 1 hour = 2 kWh x 20p = 40p
40p + 50% = 60p (3000W consumption cost)

£39.99 (heater)
5000 hours cost = £2,000
5000 hours cost at 3000W = £3,000

Total cost over 5000 hours = £2,039.99
Total cost over 5000 hours at 3000W = £3039.99

Our electric heater will cost us £1060.01 less than a similar gas patio heater.

In both instances we can see the electric heater is about 2/3rds of the price of the gas patio heater. We haven’t factored in transport costs of getting in replacement gas tanks either!

Of course commercial rates on gas and electric can be somewhat cheaper than residential rates and if your business or home doesn’t have the correct electrical sockets in place you need to pay for an electrician on top of the aforementioned rates.

So if you’re looking to save money and reduce the impact on the environment, then electric heaters are the clear winner.

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