A tank for use in a system that outputs a liquid at a user defined constant temperature, said tank comprising: (a) a body of material having a plurality of walls (114, 115, 118) which together define a chamber for receiving and storing a supply of the liquid, the chamber having (i) a fill port for pouring new liquid into the chamber, the fill port including a collar portion, (ii) a snout-shaped auxiliary port extending out from the collar portion of the fill port for adding liquid into the chamber, the auxiliary port including an inlet portion and an outlet portion, the outlet portion connecting the inlet portion to the collar portion, (iii) an outlet port for discharging liquid from the chamber, and (iv) a return liquid port for returning liquid back into the chamber previously discharged through the outlet port, (b) a flow velocity reducer for lowering the velocity of the liquid entering the chamber from the return liquid port, the flow velocity reducer being a body of porous material disposed directly within the interior of the outlet portion of the snout-shaped auxiliary port, (c) a filter disposed within the chamber for filtering fluid entering the chamber from the fill port, from the auxiliary port and from the return fluid port, and (d) further including a removable cover assembly for covering the inlet of the fill port, the removable cover assembly comprising a funnel shaped cover and a removable sealing cap. (a) a body of material having a plurality of walls (114, 115, 118) which together define a chamber for receiving and storing a supply of the liquid, the chamber having (i) a fill port for pouring new liquid into the chamber, the fill port including a collar portion, (ii) a snout-shaped auxiliary port extending out from the collar portion of the fill port for adding liquid into the chamber, the auxiliary port including an inlet portion and an outlet portion, the outlet portion connecting the inlet portion to the collar portion, (iii) an outlet port for discharging liquid from the chamber, and (iv) a return liquid port for returning liquid back into the chamber previously discharged through the outlet port, (i) a fill port for pouring new liquid into the chamber, the fill port including a collar portion, (ii) a snout-shaped auxiliary port extending out from the collar portion of the fill port for adding liquid into the chamber, the auxiliary port including an inlet portion and an outlet portion, the outlet portion connecting the inlet portion to the collar portion, (iii) an outlet port for discharging liquid from the chamber, and (iv) a return liquid port for returning liquid back into the chamber previously discharged through the outlet port, (b) a flow velocity reducer for lowering the velocity of the liquid entering the chamber from the return liquid port, the flow velocity reducer being a body of porous material disposed directly within the interior of the outlet portion of the snout-shaped auxiliary port, (c) a filter disposed within the chamber for filtering fluid entering the chamber from the fill port, from the auxiliary port and from the return fluid port, and (d) further including a removable cover assembly for covering the inlet of the fill port, the removable cover assembly comprising a funnel shaped cover and a removable sealing cap.