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?
Most tank-type water heaters last 10 to 20 years, with the average age of replacement between 12 and 14 years. 1)Quality of manufacture - As your would expect, the premium-priced water heaters with the longer warranties and features like a porcelain-lined tank, larger heating elements, and better insulation will hold up longer.