Some possible answers
I had the front-load portable version of this, so I'll infer that it's similar feature-wise. (If that's not the case, someone who has had this beast can chime in.)
- Does it heat the water itself?
Yes, if you select the 150-degree wash option, it will pause to raise the temperature to the target temp. The model I had didn't use a time-out, so if you put tap-cold water in, it would sit there and wash away until, three hours later, you finished the cycle and had steaming-hot water.
- Does it have a fan and or heat to dry the dishes?
Both.
- Is it very roomy, considering it is a top-loader?
That depends on your definition of "roomy." The bottom rack is competent, and lacks a tower. The tine spacing may defeat your ability to put cutting boards or cookie sheets along the sides.
The circular top-rack can be capacious if loaded carefully; in my testing of my Roto-Rack against other competitors, I usually only have to omit one or two small items. Securing plastics can be challenging. You'll learn to load it the way one weaves a basket, to interleave and secure lighter items.
- Will I be sorry I made this purchase? ; )
It's a vintage appliance, subject to aging, part failures, and the eventual outcomes of earlier engineering designs that might have been abandoned for a reason. Magic Eight Ball says, "Unclear at this time." Enjoy it in good health, until it's not enjoyable anymore. I wish you all the best. ;-)
I had the front-load portable version of this, so I'll infer that it's similar feature-wise. (If that's not the case, someone who has had this beast can chime in.)
- Does it heat the water itself?
Yes, if you select the 150-degree wash option, it will pause to raise the temperature to the target temp. The model I had didn't use a time-out, so if you put tap-cold water in, it would sit there and wash away until, three hours later, you finished the cycle and had steaming-hot water.

- Does it have a fan and or heat to dry the dishes?
Both.
- Is it very roomy, considering it is a top-loader?
That depends on your definition of "roomy." The bottom rack is competent, and lacks a tower. The tine spacing may defeat your ability to put cutting boards or cookie sheets along the sides.
The circular top-rack can be capacious if loaded carefully; in my testing of my Roto-Rack against other competitors, I usually only have to omit one or two small items. Securing plastics can be challenging. You'll learn to load it the way one weaves a basket, to interleave and secure lighter items.

- Will I be sorry I made this purchase? ; )
It's a vintage appliance, subject to aging, part failures, and the eventual outcomes of earlier engineering designs that might have been abandoned for a reason. Magic Eight Ball says, "Unclear at this time." Enjoy it in good health, until it's not enjoyable anymore. I wish you all the best. ;-)