I usually boil tea water on…
-
Outdoor fire
-
Hearth
-
Stove burning room pressure liquid
-
Primus stove
-
Stove with LPG cylinder
-
Stove with municipal gas
-
Submerged water boiler
-
Electric stove
-
Induction stove
-
Water boiler
-
Electric kettle
-
Coffee machine
-
Microwave oven
-
Vending machine
-
Central heating
-
Solar hot water panels
-
Oven
-
Geyser or natural hot water springs
-
Car engine
-
Computer processor or video card
-
Lens collecting sunlight
-
Nuclear reactor
-
Volcano
-
Breathing fire
-
I make tea from cold water
-
I buy tea
-
I never drink or make tea
I guess this is too long as well. Should try to find a way to make it shorter. Or find a place for longer polls.
Update: added Geyser or natural hot water springs.
Update 2013-02-16: done at I usually boil water for tea using a(n) ....