i have a 2 can furnace with 2 jth7 burners it gets plenty hot enough,but it uses way too much fuel to keep using the 2lb cans i want to hook it up to a 20lb grill tank. i bought a coleman tee that screws into the grill tank and has two male small 2lb ends. so i can screw my jth7's on to the tee and screw the tee into the grill tank. my question is this, can i hook it up like this or do i need a regulator in-between the 20lb tank and the tee? thanks....willy