<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:10pt;color:#000000;"><div>Could anyone help me understand the calculation for the minimum efficiency of gas storage water heaters per the table above?<br><br>The calculation is 80%Et (Q/800+110 SqRt V) SL, Btuh.<br><br>I understand that Q is the nameplate input rate in Btuh and V is the volume.<br><br>Do I use the volume of the whole system, the storage tank only or the recovery rate volume?<br><br>I understand SL is the standby loss. Does SL, Btuh mean multiply the equation in parenthesis by the standby loss in btu's per hour?<br><br>Thanks for the help,<br><br>Paul Diglio<br></div>
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