Kinda, not really. You need HEAVY water, which can be made, yes, but it's not simply plain ol' H20. And that's incorrect, it's closer to 5 million RF/t, but you lose some of it to the refinery and some more if you have to generate heavy water rather then using a natural source, but it's still(IIRC) over 4 million RF/t if you export all the energy profits to RF.If you have plenty of stuff you could try the new fusion reactor from reactorcraft apparently it makes 4096 Rf / t from basically just wateror one of the other reactors like buckeye but that's more dangerous