Please see the pdf sheet below for electrical specs... https://www.etundra.com/pdf/210hx.107752.pdf
This would ultimately depend on what voltage you needed this in but below is the link for the 120V element... https://www.etundra.com/restaurant-parts/electrical-parts/elements/toaster/commercial-12-one-quarter-inch-quartz-element-60v-425w/
Hood requirements vary with differing local codes. Please check with your city or county to find out if you need a hood system for the Holman - 210HX.
It depends on what you are going to cook in the oven and what the local fire codes are. I would suggest speaking to the local Fire department or building code inspectors to get clarification, but here are the general guidelines. Type I hood - a kitchen hood for collecting and removing grease and smoke. Type II hood - a general kitchen hood for collecting and removing steam, vapor, fumes, heat or odors.
Yes, you can make cookies in a conveyor oven. This unit weighs approximately 38 lbs and is easy to move. I need the the model number of the other oven you are looking at to give you the information requested above.