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?
I have seen other heaters last over 25-30 years.........but that is rare. According to NAIB 1997 and Freddie Mac 2002, they state average life span for an electric water heater is 10-15 years, and a gas one 15-18 years. I think that could be optimistic.