Heating capacity by wattage over time
Does anybody know where I can find an appropriate calculator to help me determine load capabilities of a heating element? I am trying to determine if it is possible to build a system that uses a RIMS tube to heat the strike and sparge water within a reasonable time frame.
I am thinking something my wife could start when she gets home from work and two or three hours later would have a specific volume up to temp. I know the math for btu's into water but I need to calculate watts into BTUs. 
Try this calculator http://gnipsel.com/beer/software/calculators/electricheat.xls

That's a great spreadsheet. Full of good info.

a good rule of tumb for doing things in your head is 1000w = 3400BTUs
and for those that dont know the BTU calculation its: (weight of water, in pounds) x (end temp  start temp, in degrees F) = BTUs required or (#gallons) x (8.3) x (temperature change, in degrees F) = BTUs required 
1 kW = 3412 BTU per hour
or 1 kW hour = 3412 BTU watts are a measure of power, BTU is a measure of energy. :) 
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