Hi, I am not certain but I believe the 50 watt rod is capable of approximately 180 btu per *hour*. Definition of a btu is: http://www.bartleby.com/65/br/BritTU.html and also http://www.nrc.gov/NRC/EDUCATE/GLOSSARY/British%20thermal%20unit%20(Btu).html To convert them look here: http://ww4.choice.net/~shender4/units.htm Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T. Tuner for the Saskatchewan Centre of the Arts mailto:drose@dlcwest.com http://donrose.xoasis.com/ 3004 Grant Rd. REGINA, SK S4S 5G7 306-352-3620 or 1-888-29t-uner
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