Half a croissant, on a plate, with a sign in front of it saying '50c'
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Fridge-Kettle

Use all the concentrated heat coming from the inside to heat water
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The Fridge-Kettle has a usually Fridge bit, but on the side is a tap for boiling water. It could even be in the front alongside chilled drinks dispensers with suitable insulation.

Once plumbed in to the potable water pipe, a 1 litre tank is filled. This tank takes advantage of the heat coming out of the compressor and cooling grill to raise it to 80+ degrees C* - both are hot to the touch and both try to dissipate heat to the room instead of somewhere useful.

A button is used to dispense water 50cc at a time, each amount be heated the final step from 80 to 98 degrees C.

Hot water on demand for the fraction of a cost of boiling from tap temperature.

* May or may not breed extremophiles over unit's lifetime.

bigsleep, Feb 04 2017

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       50cc is barely enough water to wet your whistle, let alone make a decent cuppa. You'd need to have FIVE Fridge-Kettles running side-by-side to make one imperial cup!
Canuck, Feb 05 2017
  

       You press the button a few times then.   

       Maybe it could be a continuous flow thing with a small delay to raise it the last few degrees.
bigsleep, Feb 05 2017
  
      
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