If you are using GI pipe para linya ng tubig ay no need for ground cable kasi yung pipe mismo ay grounded na, pero pag PVC then you need to put grounding.
However, kung may ELCB (earth leakage circuit breaker) na yung water heater nyo ay safe na kayo. Normally you will see this ELCB sa mga new design na water heater (dial type selector with electronic board). But for the 3 position selector (lo/med/hi) ay mga old design yun and usually wala silang ELCB. Dagdagan nyo na lang ang budget nyo ng kaunti and purchase dial type. mas maganda kung may pressure switch or flow switch yung unit.
sa installation, advisable na mas mataas yung shower head sa heater unit para palaging may tubig yung heater module to prolong heater life....









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