hot and cold water systems

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Across
  1. 1. every property should deliver drinking water to this room
  2. 5. the valve used to control the water on a bath, basin or sink
  3. 8. the electrical heater inside the hot water storage
  4. 10. the pipe that is a safety route for boiled water if overheating occurs in a hot water system
  5. 13. this controls the water level in the cistern, usually brass and has a rubber washer inside
  6. 14. the plastic used to make push-fit pipe
  7. 15. the system which stores water and is low pressure
  8. 16. the valve used to stop the mains water as it enters the property, designed for high pressure
  9. 18. we should do this to a water storage unit to improve efficiency, stop over heating and stop freezing
  10. 19. the water system that is high pressure fed from the mains and no stored water
Down
  1. 2. the component that supplies cold water to taps and the cylinder and allows expansion of water in the system
  2. 3. the component that is on the pipe work before it enters any storage vessel
  3. 4. a component that is usually brass and is installed at any low point on a water system to remove water
  4. 6. the type of plastic used to make the cold water storage vessel
  5. 7. the pressure that supplies a direct water system
  6. 9. a plastic foamed material that has air trapped in it to stop warming and freezing of water
  7. 11. the pipe that circulates around the inside of a hot water storage vessel to heat the water from the boiler
  8. 12. the valve without a washer in it, designed for low pressure systems
  9. 17. the word to describe wholesome water