BTU/hour

What Size Heater Do I Need Based on BTU/Hour?

Did you know you could size your heater based on BTU/hour?  How you ask?  Well please read a little further to learn!

Keeping your industrial workplace or office the proper temperature for equipment and manufacturing, as well as comfortable for your workforce is a crucial requirement for any business. If your company’s furnace is too big, it will turn off and on too often and will become less efficient, whereas if it too small, it will cycle on too often and won’t provide adequate heating for your business.

While heating contractors use a variety of often complex load calculations when determining a furnace size,  and it is best to allow a professional to determine your needs, there are some “rule-of-thumb” calculations you can use to estimate the proper furnace size for your business.

Furnace Heating Efficiency

Different furnaces deliver different heating efficiency levels. If your unit is 85 percent efficient, for example, it delivers 85 percent of its fuel as heat into your building. The higher its efficiency, the lower its fuel usage rate, which means it will be less expensive to operate. While more efficient models tend to be pricier up front, they generally cost less over the long term.

BTU/hour

Heating Degree-Day Calculation

A British Thermal Unit (BTU) is a measure of thermal or heat energy. To calculate your BTU/Hour, it’s best to use a specific month, such as August, as a factor when applying a heating degree-day calculation. Natural gas used by your furnace is priced per therm, or 100,000 BTUs. Annual and monthly therm usage rates are listed on your company’s gas bill. Your furnace needs to provide a specific load, measured in BTU/Hour, in order to heat your business. The basic heating degree-day calculation for furnaces is: 50 x furnace efficiency x heating therms = load in BTU/Hour.

BTU/hour

Calculating Your Furnace Size

For example, suppose your warehouse uses 1,500,000 therms of natural gas annually, your furnace is 82 percent efficient, and your August usage rate is 25,000 therms. Subtract 12 x 25,000, from your annual therm usage rate — 1,500,000 – 300,000 = 1,200,000, or your company’s therm heating load. Using the calculation formula (50 x 1,200,000 x .85), your heating load is 51,000,000, and needs a furnace that can handle that load.

BTU/hour

For more information about your company’s BTU/Hour needs, and professional support in selecting the best furnace for your specific heating requirements, contact the experts at Heatrex today. Heatrex has provided our valued clients with the highest quality industrial and heating solutions on the market since 1959.

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