"Went to 1 ID firm last nite, being advise to us for considering installing either elect heater/storage heater because city gas water heater sometimes took abt 10-15mins for it to have hot/warm water upon turning on the tap. Is it true? Because i don't get to see from citygas website stated how long does it takes to have warm/hot water after turning on the tap. Any kind soul that has installed, can hear from your feedback? Thanks." I was told this as well , that it took 10mins or so for the water to be warm, and heard very different feedbacks about whether is this true.... are there any other alternatives available? also, anyone know whether does the rainshower head rust easily? i went a few hotels overseas and those with such showerheads are always rusty...