This sounds more like a specific question for a gas technician suited to your venue and application. I would recommend contacting a member of our sales team directly at 888.388.6372 to discuss further details.
Here are all of our Rinnai Rice Cooker component parts available. Please contact our sales floor directly for further assistance with parts that will suit your needs.
Yes, only 1 pot is included with this Rinnai Rice Cooker. We also do offer additional pots seperately as SKU 62235; https://www.etundra.com/restaurant-parts/cooking-equipment-parts/rice-cookers/rinnai-rr77-1733-rice-pot-assembly/
Yes, the electrical requirements are: 120 V.AC / 60Hz; 23 Watts, 120V / 3A Fuse.
I'm attaching a link to a full parts breakdown of this model that shows all of our parts we have for it. http://www.etundra.com/Rinnai_Rice_Cooker_Parts-P8826.html?token=512|||0|24|7|1|0
The interior of the rice pot is cast aluminum. Care should be taken when cleaning with scouring pads as aluminum is soft and tends to scratch easier than harder metals such as steel.