Electric instant water heaters Easy to instal & use instant water heaters. Optional : safety elcb ( our innovation), booster pump raises flow by 3-4 times. Power : 3.5kw to 9kw single phase 220v-240v. Individual gift box, 5 or 10 per export carton. Gr wt : approx 12kgs to 35kgs per ex carton of 10 units depend on product model.