yeah....who said uranium produces heat under pressure? it's a radioactive fissile element.
and Hydrogen can "stick" with other hydrogen atoms to make helium, the fusion itself makes enormous heat(3 or 4 times more than fission)
by the way,for ppl who don't know, deuterium is an isotope of hydrogen with symbol ²H
if there are some errors it's because i don't speak english very good