Tea time

A little while back, L and I were talking about the merits of various tea urns, tea kettles and such for producing hot water. Being the nut I am, I made a spreadsheet to show how long an urn would take to heat up. Google gives me a way to share spreadsheets that's pretty convenient here. More or less, I calculate the number of milliliters, then estimate raising the water temperature by 90 degrees C. Then, based on simple conversions and the wattage of the kettle, I calculate how long it will take to heat up. For a 1000 watt urn heating 30 cups of water, it's about 44 minutes. I'm sure patience is a virtue, but it's one best enjoyed over tea, not waiting for it.