Could someone please explain this heating element diagram to me?

I want to reach a temperature of 210° and maintain it. I know that I need to measure the temp and turn it on/off at certain values. I’m fine with that.

My problem is that… I’m not sure how to power the heater. My Arduino experience is lighting LED’s and building kits with detailed instructions.

Will I need an external power source? What kind would be appropriate? I thought it was going to be a case of trial and error until my dad started talking about how I could kill myself… so I’m hoping to find clear instructions on the first step (powering the element) as I feel it’s the most dangerous.

This is the heating element the last picture features the diagram although if you know better hardware for this task I’m happy with that.

Thank you for any help and guidance.

Touch here for the full post on the Arduino Apprentices tumblr

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