An existing shower is retrofitted with a novel shower panel that uses the existing on/off water pressure and temperature control valve without any re-plumbing behind the shower wall. The shower panel includes a support frame, a diverter valve, a plurality of water jets, a side showerhead, a hand nozzle and an overhead showerhead. The support frame has an open side that faces the shower wall. A first tube connects the diverter valve to the plurality of water jets. A second tube is connected to the diverter valve at a first end and has a threaded connector at the second end. The threaded connector is adapted to connect to a shower water source after the existing shower pipe is removed. The first tube has a smaller diameter than does the second tube. The plurality of water jets are arranged within a square that is twenty-five centimeters on a side.