The first one I’ve seen that actually provides the water at a high enough temperature to make tea immediately from the tap is the quooker. I have a different one (quooker isn’t available in the US 😢), but it maxes out at about 85°C, so for black tea (which is what I tend to drink) I still have to put it in the kettle to get the rest of the way. For most people in countries with 240V electricity, the difference compared to just using the kettle isn’t really worth it.
The first one I’ve seen that actually provides the water at a high enough temperature to make tea immediately from the tap is the quooker. I have a different one (quooker isn’t available in the US 😢), but it maxes out at about 85°C, so for black tea (which is what I tend to drink) I still have to put it in the kettle to get the rest of the way. For most people in countries with 240V electricity, the difference compared to just using the kettle isn’t really worth it.