Preheating a vessel.... A difficult achievement for me for living in Southern California. After a girl friend of mine did an extensive research on water quality on the web, she discovered that the best quality of drinking water are not from a bottle, rather filtered water with complex filtration system - at home or water vending machine. I don't have the luxury of having such a unit in my apartment. So filling up jugs and jugs of water became routine. I tried a few vendors, my favorite is Glacier - vending machine at supermarkets. It includes 6 filtering processes. The water taste sweet by itself. These machines are well maintained with a scheduled filter change and testing.
A vendor at the Vegas Tea Expo was selling these commercial filtration units, they claim the process will first remove all the chemicals of tap water, then remove ALL the minerals, ultra violet light for killing germs and bacterias, then more filtering, then ADD a combination of essential minerals back into the water as a final process. The system cost $2500 each and a maintenance fee of $400 every 3 months for changing filters. Pretty steep eh! Home units start within a couple of hundreds, around $50 for changing filters every 3 months.
Well, my point being carrying large jugs of water is problematic for me. It's how I broke my finger a few weeks ago! A 3 gallon (I dare not to use a 5 gallon jug) jug full of water fell off the back of my hatch back, I was convinced my hand can withhold the weight of 25+ lbs flying off at a speed multiplied by gravity. What a girl would do for a cuppa good tea!
I am a bit of a Jew when it comes to preheating a vessel, the constant reminder of my still painful swollen finger. Filling up a vessel only half way is as generous as I could be, I know it's not sufficient, BUT.... I'll be generous when I install a unit in my future home.