A heater with a greater BTU rating is more powerful—that is, it produces more heat—than one with a lower BTU rating. It may boost the temperature in your room faster each hour, allowing you to either heat a room faster or heat a greater space. Of course, higher prices usually go along with higher BTU ratings.
The amount of power that a heater consumes is called its "energy rating." Energy efficiency ratings are found on product labels and include such information as peak wattage capacity (the highest amount of power the heater will consume at any given time), total annual energy consumption, and heating capacity. For example, a heater that measures 10 by 14 inches and that has an energy efficiency rating of 15 watts will use about 1.5 pounds of coal per day if it's used six hours every day for two months straight. A 20-watt heater would use 3/4 pound per day. Higher numbers mean more efficient heaters.
Higher BTU number heaters tend to be more expensive than lower BTU number heaters of the same size. This is because they are usually made from stainless steel or other materials which are more expensive than aluminum or plastic. They also usually have thicker walls and larger fans to move more air.
They are accustomed to informing you of the capacity of both heaters and air conditioners. Because BTUs represent the amount of energy needed to heat a pound of water, this rating system is ideal for heaters. The greater the BTU rating of an air conditioner, like with heaters, the more powerful it is. Heating and cooling systems contain circuits of metal tubing through which refrigerant flows. The higher the number, the larger the circuit and the more efficient it is.
Heaters and air conditioners that use btu have a label on them that shows how much heat or coolness they can make in British thermal units (or Btus). One Btu is equivalent to 0.45 kw or 4.18 watts, so the label tells you how much power the heater/air conditioner needs to operate. These labels also show that these devices emit harmful gases as well as absorb heat from your home. You should never run a heater or air conditioner when it's plugged into an extension cord because even though it may not be using any electricity at the time, it still emits carbon monoxide gas.
Heaters and air conditioners are very useful appliances that keep us warm in winter and cool in summer. It's important to choose one that has enough BTUs for your home heating and cooling needs and read the label regularly to make sure it stays within its capacity.
BTUs are a unit of energy, but watts represent the rate at which energy is delivered, hence the two do not immediately equal. It merely requires a simple calculation to convert the watts or BTU/h number necessary to heat your area into your preferred measurement if you know the wattage or BTU/h figure. There are also various other factors that may affect the conversion factor, such as humidity, but this is generally accurate enough for most applications.
One benefit of converting from watts to BTU/h is that you can use the information to determine how much it will cost you to run certain appliances. For example, if you know that you need 1,000 watts to run a hot plate but the heater in your house uses 15% more than that, then you know that it will actually take about 1,500 watts to run the heater full time. To calculate the amount you will spend on electricity, simply multiply 1,500 by the price of electricity per kilowatt hour (kWh) and you have the total amount you will pay for power over the course of a year.
Similarly, if you know that you need 20,000 BTU/hr. To heat a home with a medium size living room then you can calculate how many watts it will take using this formula: 20,000 / 0.12 = 166.7 watts.