 And if you do add hot water, you're also going to need to be sure to insulate the entire line. But honestly, I don't really see the need for hot water outside unless this is some super gourmet kitchen. If that's the case, just go for it. All right. Now, last, you've got to think about the cooking. Most outdoor kitchens are going to include a gas or charcoal grill. And if your home already runs on gas, then you can plan to run a gas line to that grill that's designed to run a natural gas grill.