Online calculators are very unreliable. The best way is yell.com a professional will carry out all sizing correctly and installation. Don't waste time and money trying to save time and money.
Made a fair few mistakes in your description, it's clear to me what your thinking but your in the complete wrong area.
I recommend yell. Com. It's full of highly trained professionals with a wealth of knowledge and eager to assist you
Dan that install is nice But the grey waste is a poor colour choice. And do those lever valves including the all important gas one fall to the ON position?
well said well said
now go get yellow pages out and pay an expert Aigle and I are trying to earn a living well when u mess it up completely we will gladly come fit a new burner for a very high price of course :D