Never Order Anything On Starbucks' Menu With Extra Hot Water. Here's Why - Tasting Table
Briefly

At Starbucks, customers can customize the temperature of milk-based drinks like lattes or cappuccinos to be warm, steamed, or extra hot. However, drinks that rely on hot water, such as teas and Americanos, cannot be made extra hot because the brewing process delivers water at a preset temperature that baristas cannot change. Instead, patrons can have oatmeal heated more by requesting hot milk instead of water, although this alters the dish's texture and nutritional profile.
One workaround if you want your Starbucks oatmeal to be as hot as possible is to ask your barista to sub some of the water for extra hot milk. This will change the consistency and calorie content of your breakfast, but you'll enjoy a cozier and richer tub of oats.
While you can request extra hot beverages with milk at Starbucks, hot water drinks cannot be made hotter as they come out at a fixed temperature.
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