@Nisse_Hult Besides the grounding and other measures the electricity can't run directly from the shower head to you through the water because the water drops are not continuous so even in an poorly installed electric shower you probably will only get shocked when you touch the metal faucet and not by the water drops (and I had this experience before, not as bad as you might think, just startling). Also considering how poorly maintenance and "improvised repairs" are common in Brazil an electric shower is safer than a boiler.
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@Nisse_Hult Besides the grounding and other measures the electricity can't run directly from the shower head to you through the water because the water drops are not continuous so even in an poorly installed electric shower you probably will only get shocked when you touch the metal faucet and not by the water drops (and I had this experience before, not as bad as you might think, just startling). Also considering how poorly maintenance and "improvised repairs" are common in Brazil an electric shower is safer than a boiler.