Brian Gaff wrote

I am not sure what you mean.

He wants a higher power microwave that heats
say a cup of water in less time. Trivially buyable.

You can also get commercial microwaves that
have two magnetrons put a lot more microwaves
into want is being cooked to cook it faster.

Surely the speed of heating depends on the absorption of the energy by
what is inside the machine.

But that depends on how much microwave power the
magnetron is putting into the oven chamber itself.

He's talking about cooking food or heating water.

If its not high enough in things that can get hot, like water content, you
can cook it as long as you like with little effect at all.

"William Gothberg" wrote in message
news
Shouldn't we have faster microwaves by now giving out a few kW? They
were
invented decades ago.