difference between 2400e and 2400es?

Is there a difference between the Bosch Aquastar 2400E and 2400ES models. The E is a bit more "compact" and also has a thermal efficiency rating of 86% compared to 82% on the ES, but E has an energy factor of .80 compared to .82 on ES. And the E has minimum input of 31k Btu and .8 gpm to activate, whereas the ES has minimum input of 19.9k Btu and .65 gpm to activate.

Thanks in advance for all your help.

bosch

The E is a bit more "compact" and also has a thermal efficiency rating of 86% compared to 82% on the ES, but E has an energy factor of .80 compared to .82 on ES. And the E has minimum input of 31k Btu and .8 gpm to activate, whereas the ES has minimum input of 19.9k Btu and .65 gpm to activate.

I guess you have pretty much stated the "differences".