Main Use: This pump solves the problem of inadequate water causing no lit Fire because when the tap water is of low pressure , the pump can boost pressure . It can also boost pressure for solar water heaters , boost pressure and circulate water for industrial equipment , and increase oxygen for rearing ponds or fish tanks GR hot water pump boost pressure and circulate hot water for boilers besides above using. GR hot-water type also can be used for circulation and pressurization of hot water. 15GZ best feature is that it can suck tap water from one or two floor below directly. so it completely solves the problem that the higher floors don't have water while the lower floor has. Packing List: 1 x120W Hot water pump 1x Power cord 1 x Operation manual 1 x Output test line .