[chihuahua]

I found that 160F to 180F is enough for instant coffee, depending on personal taste and what you feel like at that moment. I have an electric kettle that has a several buttons for different temperatures, and heating only to 180F saves time over heating to boiling, plus I can drink it right away.

[mbirth]

Yep, all the instant coffee jars I’ve seen have a note to use hot but NOT boiling water. And I’ve noticed that using too hot water can even spoil the taste a bit.

I usually turn off the kettle when the noise starts noticeably changing. This usually is something between 70-80℃.