Re: If a rig uses 1kW/h does that mean 1kW/h of heat or less?
Thank you. 
Gop back to school, whatever school you went to return your certificate saying you slept in basics physics.
Per basic physics it means 1kwh heat - other energy output which is sound (VERY little) and anything else.
People learn this in 5th grade here. Energy preservation.
ESPECIALLY: YOU CAN NEVER HAVE MORE HEAT THAN THE ENERGY YOU USE. This is when you burn something the inner energy (exothermic reaction) bu a computer does not use up any fuels, you know.
this is not true for all things the use electricity
motor's for example have some heat loss and some is the work performed
transformers also have some lost to heat, some to emf generating it's field, the rest is load on its secondary side
guess you missed something in physics class too