I have the big one and it boils 55 gallonsin 40 mins and I MEAN BOILS. The only pitfall with these are the jets. If one is brokin it will kick out a yellow flame which isnt very hot. Now here is the real kicker. You cannot replace the high pressure nozzles ie jets. So if one breaks from mishandling you have to buy a whole new burner. However I guess you could soder it shut.
Meh... have Yuri machine you a new jet... he's mastered it.