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Unvented Hot Water Storage System

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

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Approved Documents

Approved Document G

Building Regulations Approved Document G - Sanitation, hot water safety and water efficiency

  • Section 2 - Water Efficiency
    • MAX daily internal usage - 125L
    • 5L - external usage
    • Water Efficiency Calculator
  • Section 3 - Hot Water Supply and Systems
    • Unvented cylinder should incorporate MIN 2 independent Safety Devices (3 in EU)
    • MAX delivered temperature is 48°C
    • Safety discharge requirements of expanded hot water 
      • Method of a diameter calculation for a discharge pipe

Download online version: Approved Document G

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