#1 What is a BTU?
A British Thermal Unit, or BTU for short, is the amount of energy needed to heat one pound of water by one degree Fahrenheit. One BTU is equal to the energy produced by one matchstick, or about 1.06 kilojoules.
The power for a patio heater is measured in BTU’s, so the more BTU’s a heater produces, the higher its heat output is. However, two patio heaters that produce the same amount of BTU’s can have varying heating ranges based on their design and overall efficiency.
#2 What size heater do I need?
Use this simple equation to determine how many BTU’s you need to heat your space: Cubic feet of area x desired temperature rise = BTU's needed
Keep in mind, if you live in an area with high winds, the constant inflow of cold air can affect the heater’s overall efficiency and performance.
#3 What types of patio heaters are there?
Depending on the fuel type you prefer, there are several styles of patio heaters available. Propane and electric patio heaters are available in portable, tabletop, hanging and ceiling/wall-mounted styles. Natural gas patio heaters are permanent installations and are available in ground-mounted, ceiling/wall-mounted, and hanging styles.
Check out our Patio Heater Buying Guide for more information!
#4 How much does it cost to operate a patio heater?
Natural Gas: A typical 40,000 BTU patio heater that heats an area of 314 sq ft will cost an average of 48 cents per hour to use.
Electric: The average cost for a 4,000-watt electric patio heater is 60 cents per hour (15 cents per kilowatt hour).
Propane: A typical 40,000 BTU patio heater will cost about $1.70 per hour to use.
Gas and electricity rates may vary depending on where you live and the efficiency of your patio heaters.
#5 What is the required clearance around my patio heater?
Always consult the owner’s manual before installing your patio heaters to find out what the required clearances to combustibles are. This will help you to determine the safest location for your patio heaters.
Generally, portable patio heaters that produce between 35,000 and 50,000 BTU’s will need at least 30 inches of clearance to combustibles on all sides of the reflector and emitter screen, while smaller patio heaters that produce 10,000 to 35,000 BTU’s need at least 24 inches of clearance to combustibles on all sides of the reflector and emitter screen.
#6 Can I use a patio heater in my enclosed patio?
Gas patio heaters cannot be used indoors. They should only be used in an open outdoor space with plenty of air flow.
Electric patio heaters can be used in both indoor and outdoor spaces. They don’t produce carbon emissions or greenhouse gases making them the safest and most environmentally conscious choice.
#7 Can I use a patio heater on grass?
No, free-standing patio heaters should always be placed on a solid, stable surface, especially if you live in a windy area. Uneven ground, like grass creates instability and may cause your patio heaters to perform poorly, or even to tip over.
#8 During operation, will the base of the patio heater get hot?
No, the base of a patio heater will not get hot during operation since it doesn’t come into direct contact with the heat source. The emitter screen and dome, however, will get hot.
#9 What is a safety tilt-switch?
Most patio heaters have a safety tilt-switch or tilt shut-off valve. A safety tilt-switch is designed to automatically shut off the heater if it gets knocked over or if it’s tipped past a certain angle.
#10 What is the difference between large single dome patio heaters & triple dome patio heaters?
A large single dome patio heater directs heat in one direction, while a triple dome patio heater directs heat into three separate areas, providing a more even heat distribution and keeping the heat produced protected from the wind. Both styles have a heat output of 40,000 BTU’s and feature a ceramic cone insulator that allows for longer heat retention and improved heating efficiency.
Head over to our Patio Heater Buying Guide to learn even more about patio heaters!