Hi,
That is not practical. Wattage is a matter of megnetron size and
it's power supply(the guts of unit)
I'd just replace the whole unit with new one if you use it
a lot.
Tony

tflfb wrote:

I have a 700 watt Microwave( Whirlpool ) oven above the kitchen stove, its a
micro/ exhaust fan combo.

Is it possible to have a bigger tube installed in order to up the watts, to
at least 1100.

Also the oven is 10 yrs old, takes forever as it is to heat anything.
There's a crack in the plastic trim on the door.( cosmetic)

I was never aware when I bought the oven that watts made a difference when
cooking.

A new oven is going to cost me at least $275, I will install it my self.

Thanks Tom