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?
The next consideration is life expectancy. Often, electric hot water heaters last longer than natural gas units due to the lack of corrosion and deterioration from the gas fired flame on the bottom of the inner tank. This does vary considerably depending on the mineral content of the water in your area.