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Domestic Hot Water

Exam revision materials for Plumbing Level 2&3 and ACS Gas Safety test

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Hot Water Cylinders

Heat Sources



  • SEDBUK efficiency:
    • 2005 - MIN 90%
    • 2009 - MIN 88%
    • In exceptional circumstances by CLG - MIN 78% for natural gas and 80% for LPG
< Go Back2013-04-14

Immersion Heaters

Immersion Heater

  • immersion heater spanner to service
  • 15A fuse (16A MCB)
  • Bottom entry is better – 25 mm above the cold water inlet
  • MAX 3kW for domestic (1kW of heat is needed for every 45 liters of water)
  • Heat Recovery Period (sec) = Power x 4.186kJ x kg x Temp Rise x Time (sec)
< Go Back2013-04-14