By the time you fab up the connections to each keg.
3 x Drains (ferrules) welded - unless you flip the kegs
3 x Fill ports, 90deg turns , straight lengths etc
multiple clamps
3 x drain valves
3 x heating elements or gas burners (and bottles)
and 3 x stands
Extra pipe and welding.
One of these would be cheaper, nicer to look at, easier to control and more compact.
Plus the run would be that much faster. being 100ltr not 150 ltr
http://www.5stardistilling.net/100l-pro-boiler/Sometimes we can over think things when there are ready made mass produced answers right under our noses. :D :handgestures-thumbupleft:
Or
Ask Mac if he would do a 150lt boiler with all the above advantages.
Just my 2 cents
DBV