No way would I go with that much room. Is the 29 gallons before evaporation? Probably boil a couple gallons off, but to start with, that's way too close for me. 20 gallons in my 25 gallon kettle is really cutting it close.
Too tight, we use a 20g kettle and a 15.5g keggle to boil 30 gallons and it gets close at hop additions. It could be done if you really watch your burner and are standing by with a hose. Definitly a 2 man job and wont be easy.
__________________ Redlight Brewing
Primary: Deep Woods IPA
Secondary: Belgian Wit
Kegged/bottled #1-Nut Brown #2-American Wheat IPA #3-Templetons Rye Barleywine #4-Belgian Wheat Wine #5-Belgian Wit