Quote Originally Posted by Poconos
Have to verify the 333K is total or output, that is whether efficiency has to be figured in the calculation. Not sure of this but it may be that gas companies may charge per cubic foot in which case you have to figure in the cubic foot to therm factor which is very close but not quite 1.00
Al

That number is the amount of fuel consumed per hour, it has nothing to do with efficiency. The actual heat put into the pool will be less than that based on efficiency of the burner and heat transfer - but that is still the amount of fuel you are consuming.