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Tankless Efficiency

SpeyFitter
SpeyFitter Member Posts: 422
in Domestic Hot Water
I'm just curious if anyone knows the procedures for testing AFUE on a tankless unit. Do they test it the same way they would test a boiler with perhaps a long burner on time, or do they factor in some short cycles caused by short draws (e.g. hand washing) of water that would be indicative of real world use?

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  • Larry Weingarten
    Larry Weingarten Member Posts: 3,590
    My understanding...

    ... is the standard DOE, EF test is used.  This is six equal draws, totaling 64.3 gallons.  The test unwittingly favors tankless design over tank-type.  There is an effort underway now to change the test to reflect more of a real world draw pattern. Here is a link to an interesting study of the EF test.  http://fire.nist.gov/bfrlpubs/build03/PDF/b03033.pdf



    Yours,  Larry
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