I think you will be OK. I do 10 gallon batches, and I can get 8 gallons sparge water up to 180 DG +/- 30 Minutes. If you live in a windy area though, you will need a wind screen. Under normal conditions, I have to turn mine down when it gets to full boil, as it can really get going.
When a naked man is chasing a naked woman through an alley with a butcher knife and a hard-on, I figure he isn't out collecting for the Red Cross." - Dirty Harry
On Tap: Belgian Orange Crystalweizen, Toecutters Honey HPA
Fermenting: Belgian Orange Crystalweizen