First, let’s start with the age of your water heater. Check the serial number on the water heater, usually found on the manufacturer’s sticker towards the top of the water heater. The sticker should show the date that the water heater was made. The first letter represents the month… e.g. A for January, F for June, L for December, etc. The two-digit number next to that is the year of manufacture for the water heater. Is your water heater approaching its 10-year anniversary? If so, it’s time to start thinking about a new water heater. If it’s older than 10 years, it’s probably time to replace your water heater. There are also other signs to look out for. Does your water heater rumble and/or make a lot of noise? Is there rust-coloured water coming from your water heater? Is there water around your water heater? These are all signs that water heater replacement is called for.