Hot Water

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Across
  1. 2. A cylinder heated by a coil
  2. 4. The vents main purpose is for?
  3. 6. The hot distribution from the cylinder must do this slightly
  4. 7. What valve is allowed on the vent pipe
  5. 10. BS8000 is about good?
  6. 11. A vent must be this
Down
  1. 1. Head height generates
  2. 3. Hot water sent from one point to all taps
  3. 5. means it's a law
  4. 8. Hot water to only one point
  5. 9. A cylinder heated by an immersion heater