I don't know about preheat... I haven't been able to figure out "hot water 
heater" either.  Why would you heat water that's already hot?  The thing is 
just a plain old "water heater."
I DID finally figure out why southerners call it an "ink pen" instead of 
just a "pen."  That's because with a southern twang there needs to some 
differentiation between pen and pin. Go ahead Tarheel; say them both and 
see if they don't sound just alike<GG>
And don't get me started on soda, pop, soda pop, coke, soda water.....
Linda,  who has spent half of her life in the south and half in the north
>From: Tarheel_Boy@webtv.net (Skallywagg ...)
>
>Now, is anyone able to tell me why we say we "preheat" an oven?  Does that 
>mean we heat it before we heat it?  Sort of like pre-boarding an airplane, 
>isn't it?  How can you get on before you get on?
>
>Bob the Tarheel Baker and part-time troublemaker  ;-