The installation of the water heater. If the installation is not done correctly, this can affect its lifespan. For example, many homeowners in an effort to save money try installing a water heater themselves but often find it is not an easy job, especially if it is a tankless gas heater. Water heaters must be fitted in an upright position and placed in a well-ventilated area. Be careful not to install the heater in any area at risk of flooding as this will rust the exterior pipes, not only reducing its efficiency but also its lifespan. You should also keep in mind future inspections and maintenance of the water heater when deciding where to install it by positioning it in an easy to access area.
Usage plays another role in determining the lifespan of your water heater as, naturally, the more water it will have to heat, the harder it will work which places additional stress on it.
If you are shopping around for water heaters, how can you be sure you are buying a good one that will last? As is the case with the majority of appliances, you will get what you pay for. A water heater that costs more will probably last longer than a cheap one. Also, be sure to check the length of warranty it comes with. Longer warranties usually mean the heater is built better and will last longer.