MTU - Plumbing Hot Water

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Across
  1. 2. A system where the boiler and tap water never actually shake hands
  2. 4. An electric heater that takes a deep dive into the cylinder
  3. 7. A circular route to ensure the taps don't run cold
  4. 8. What water becomes when it sits still for too long
  5. 9. A central vessel that’s getting into hot water
  6. 10. LEG Wasted cold water that waits for a warm arrival
  7. 15. A painful result if the mixing valve fails its duty
  8. 16. A tea-like sound that suggests your boiler is scaled
Down
  1. 1. The brain that decides when the water has had enough heat
  2. 3. A visual gap that lets you see a system's tears
  3. 5. A microscopic squatter that loves a lukewarm pipe
  4. 6. The first-hand circuit between the fire and the tank
  5. 8. A thermal "layer cake" where the hottest stay on top
  6. 11. What water does when it grows too big for its boots
  7. 12. A sizzling sound that means the boiler needs a descale
  8. 13. Putting on a warm coat to stop the heat from escaping
  9. 14. A high-pressure setup with no pipe open to the air