bio-wheel with hydor inline heater???

Hi,
I was thinking of picking up a bio-wheel pro 60 today to run to the
output of my eheim canister, to add some biological filtration to my
tank. Trouble is, I have a hydor 300w inline heater in the mail (that
I'm pretty excited about). Will the output water from the heater be
too hot when it's running for effective use of the bio-wheel? Or will
it just be a couple of degrees higher?

Thanks for any help!
Wes