Print: In this video a physiotherapist demonstrates gentle exercises for piriformis syndrome, a form of sciatica. The aim of these exercises is to stretch and mobilise the piriformis muscle in the buttocks and therefore to reduce the symptoms of sciatica. This video is part of a series on exercises for sciatica.
1 AGE: On average, your gas hot water heater should last anywhere between 8 to 12 years, while an electric model will last a bit longer at 10 to 15 years.  WATER: When you use your hot water tap, does the water look a bit tinted?
Average Life Expectancy. Properly maintained water heaters typically last between eight and13 years. The actual lifespan of your water heater depends on several factors, such as the manufacturer, maintenance, usage and installation. If you have a water heater that is more than 10 years old and it is not working properly, your best option is to replace it with a new one.