What can cause an earring in plumbing to overheat?

An earring in plumbing, which often refers to a type of pipe fitting or a component within a plumbing system, can overheat due to various factors. When too much grease accumulates within the system, it can create a blockage that restricts the flow of water. This reduced flow can lead to localized heating because the water that is supposed to cool the fitting or pipe is not moving adequately. As a result, the limited water flow can cause the fitting to overheat due to excessive friction and resistance against the grease buildup.

In contrast, while too much water pressure could potentially cause other issues like leaks or ruptures, it does not directly lead to overheating of fittings. Too little water flow is necessary for overheating to occur, but it is the grease's presence that exacerbates the problem. Too much cold water, on its own, would typically not lead to overheating issues in fittings, as cold water would generally help maintain lower temperatures in the system. Thus, the accumulation of grease is a direct cause of overheating in plumbing components.