I'd think it'd be fine, depending on your brew environment. If it's cold outside, i could see it being an issue, but I think our fryer is around that output and we don't even put it on full open usually. If you're cooking outside an ice fishing shack in alaska, spring for the 210k btu one
Mine is 170,000 and I have never turned it up more than 1/2 way for fear of scorching the wort. I did a double brew last week in record time. You should be fine. I have found the wind affects your boil time more than the ambient temp. Use a wind screen and all is well.
I use a 45K burner and it works okay. It takes about 20 minutes to get 6.5 gallons to a boil with the lid on. Once it starts boiling I take the lid off.
Mine is a 40k btu burner that I do 10 gallon batches on all the time. Suprisingly enough it doesn't take much longer to bring the 14.5 gallons of wort to a boil than my buddies 200k btu burner and I don't ever have boilovers, and he does all the time. Just get used to running it full throttle all the time.