its a cutler hammer panel, yes 200 amp service, and if you wire it to 220 you will burn it out because they are probably 110 volt elements and controls. you could check the nameplate on the heater to see though. you probably need to change the water heater out to a new one
C.J.
1997 TSi AWD 2.3L 6 bolt (Carillo Rods, Wiseco pistons, Cometic headgasket, ACL bearings, removed BS, FP3's, Crower springs/retainers, ARP hardware), FIC 950's, Aeromotive AFPR with SS lines, Walbro 255HP, PTE SCM61, Tial wastegate, Greddy Type S BOV, short route FMIC, 3" turbo back, AEM EMS, 3 bar map conversion, BJs SMIM, 75mm TB, Innovate LC-1 Wideband, 18" Focals, Bridgestone Potenza RE040's, Tokiko suspension.