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The Dyson air multiplier heaters max out at around 1575 watts. The conversion of Watts to BTUs is about 3.4, so this wattage = approx 5300 btu per hour. You need between 15-20 btu per hour per sq ft to achieve acceptable environmental comfort in your room, so these heaters should be able to get rooms 260-360 sqft to a stable temp without breaking the bank. It will be expensive to run at high temp constantly but the air multiplier design makes it more efficient than other heaters. Note however that after a couple years using this machine I’ve discovered that either the air flow (dries out your eyes leading to headaches) or ultrasonic sound emanating from the machine, cause severe headaches after a few hours of sitting in a room with the heater function running. I worked all thorough out the pandemic in 2020 with one of these running for 4-6hrs a day and found it causes these headaches. So they’re great for hearing open spaces in your house but beware if you plan on sitting in proximity to one for an entire work day.
Sorry, there was a problem. Please try again later.Hello Terry, this is Kelly with Dyson. Thank you for reaching out to us. We don't measure our machines in terms of BTU's. While our machines do have a heating element, they're measured in watts. While in heat mode, the purpose is to provided heated, purified air in to your room. How well it heats your space would vary, depending on factors such as doors and windows, how warm the room already is, the air temperature outside, etc. With our Dyson Pure Hot+Cool™ purifiers, you can set the desired air temperature all the way to 99 degrees, and you have 10 airflow speeds to choose from. Best wishes, Kelly Dyson Customer Support
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