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?
Standard tanks provide more hot water but have a shorter lifespan. Purchasing a hot water heater is an investment that should last for many years. While standard units with tanks that hold and heat large amounts of water last approximately 13 years, tankless or on-demand heaters -- either gas or electrically heated -- can last up to 20 years.