The HLT I purchased is a keg with the lid intact. It has a sight glass, a T fitting in the bottom one side to a circ pump with copper tubing running up the side and down into the top. There are 2 1400w 110v heating elements at different heights. The top one needs about 8 gallons of water to cover it enough to use it. It is insulated with a layer of the black pipe insulation all the way around and the top and bottom. In an ambient air temp of 35*, 9 gallons of water @ 48* it took 1 hour to get to 178*. That seems like a lot of electricity.