Using the Hot Liqour Tank as a Brew Kettle?

Need some advice here,

I am stepping up to all grain brewing shortly and I would like to do 10 gallon batches of both high and low gravity beers. I am thinking about purchasing the 15 gallon all grain commercial kit from Midwest Supplies. I would then use the hot liqour tank as my brew kettle and then I would convert my current 8 gallon brew kettle into a hot liqour tank. I just dont want to have to purchase another 15 gallon brew kettle if I dont have to. Does this make sense?

Also, I plan on making this a lifetime hobby and so I would just like to skip the coolers altogether.

Thanks


Link to all grain kit that I would buy.

http://www.midwestsupplies.com/15-gallon-all-grain-commercial-quality-kettle-kit.html

Sure...seems fine. 8gal should be sufficient, and even if it isn't you can always top up and reheat during mash. Ain't nothing non-lifetime about coolers, though.