Just want to add additional question to this post.. Which is safer in terms of the risks in getting electrocuted? Does the storage water heater has less risks of electrocuting someone to death while showering? Coz so far, I have only heard of people getting electrocuted by instant water heater but none from storage water heater.. Also, I am thinking of getting a centralized storage water heater to supply hot water to the whole house as it might be cheaper in the long run compares to changing 3 faulty instant water heaters..