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CCN1Core Domestic Gas Safety
The core module everything else builds on — classifying unsafe situations, tightness testing, ventilation, flueing and emergency actions.
GasRevise · Pass your ACS
Gas ACS revision
Everything for your domestic gas ACS assessments, grouped by skill area rather than a flat list. Begin with CCN1 core safety; Premium unlocks the full gas bank and mock exams.
- 1,358 exam-style questions
- 97 study notes
- 9 modules
Core Safety & Unsafe Situations
The foundation: classify unsafe situations, test for tightness, and get ventilation, flueing and emergencies right.
Boilers, Controls & Commissioning
Boilers and water heaters — controls, interlock and the commissioning sequence.
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CENWATCentral Heating & Water Heaters
Boilers and water heaters — controls, commissioning sequence and spotting an unsafe install.
Reading the Flue Gases
What the analyser is telling you, and when an appliance is not safe to leave running.
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CPA1Combustion Performance Analysis
Using a flue gas analyser — what the CO and CO₂ readings mean and when an appliance is not safe to leave running.
Unvented Hot Water & Water Regs
Two tickets often taken alongside gas and well worth holding in their own right — unvented hot water (G3) and the Water Regulations (WRAS).
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G3Unvented Hot Water
Unvented cylinders — the layered safety devices and safe discharge arrangement.
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WRASWater Regulations
Keeping the supply safe — fluid categories and the backflow protection each one needs.
Appliance Specialisms
The appliance-specific checks — cookers, fires, meters and LPG changeover.
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CKR1Domestic Gas Cookers
Cooker safety — ventilation, stability, flame supervision and clearances.
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HTR1Gas Fires & Wall Heaters
Fires and wall heaters — flueing, spillage testing and atmosphere-sensing safety.
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MET1Domestic Gas Meters
Meters and the emergency control valve — installation, ventilation and tightness.
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CONGLP1LPG Changeover
Changing a property over from natural gas to LPG — the safety differences that matter most (LPG is heavier than air).