I am finally making the switch to all grain and for my first setup I would love to try a couple of Igloo coolers as my hlt and mash tun with my 10gal kettle for boil. My question is: what is the most effective way to get heated water into the cooler/hlt? Do I simply heat to temp in my kettle and pour it into the hlt or is there a heating device that can be safely installed to bring the water to temp? Thanks