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Tankless water heaters won’t increase your electric bill. Since tankless water heaters are more efficient than tank water heaters, installing one in your home will actually allow you to save money on your electric bill. The Department of Energy estimates you can save $100 or more each year with a high-efficiency tankless water heater.

It’s possible to distinguish a positive black wire from a negative black wire if you know what type of circuit the wires are in. If it’s an alternating current (AC), then black wires are positive. If it’s a direct current (DC), then black wires are negative. 

Sometimes, a circuit has two black wires. In that case, the positive black wire will be solid black while the negative black wire will have a white stripe on it. If you’re still unsure, you can use a multimeter to check.

If you strictly adhere to electrical safety rules, including assuming that a circuit is hot until proven otherwise, and have some knowledge of how an electrical circuit works, you can likely replace a light switch by yourself without too much trouble. However, it's always advisable to call a nearby electrical pro to do the job if you're unsure of any steps necessary to change a light switch. 

No, there aren’t additional code requirements for kitchen lights. Kitchen lights and other electrical circuits in the kitchen have different code requirements. Outlets need to be particularly robust because of their frequency of use and proximity to liquids. If you need help determining where to install outlets in your kitchen, consult a local electrician who can ensure that placement is functional and up to code.