Its always frustrating when your hot water cylinder fails just after the warranty expires Its rare but it happens, even to a Rheem! In most cases the problem relates back to the quality of water. Unless your hot water cylinder is made of stainless steal it will most likely incorporate a sacrificial anode. If you are on tank or bore water supply and have a mains pressure cylinder, you should regularly (every 2-5 years) have a service done. By servicing your hot water cylinder you can avoid a nasty leak in future caused by corrosion. In this instance we were able to offer our special like for like mains pressure hot water cylinder replacement for $ 1200 all including! Concerned your cylinder is suffering from corrosion? Better safe then sorry