Product Overview

Summary: This Hot Water System Installation Safe Operating Procedure sets out a clear, step-by-step method for installing electric, gas and solar hot water systems safely and compliantly on Australian sites. It helps your team control key WHS risks, protect property, and meet plumbing, gasfitting and electrical obligations while delivering consistent, high‑quality installations.

Hot water system installation combines plumbing, electrical and (often) gasfitting work in confined plant rooms, roof spaces and domestic settings. Without a structured procedure, businesses face elevated risks of scalding, gas leaks, electrical shock, legionella growth, manual handling injuries and water damage to property. This Safe Operating Procedure provides a detailed, practical framework for planning and carrying out hot water system installations in line with Australian WHS laws, plumbing codes and manufacturer requirements.

The SOP walks your workers through pre‑start checks, isolation and verification of services, risk assessment, safe handling and positioning of cylinders, connection of water, gas and power supplies, commissioning, temperature and pressure verification, and client handover. It standardises how your teams manage hazards such as working in roof cavities, using power tools in wet areas, handling heavy cylinders, and setting safe delivery temperatures to reduce scalding risks. By implementing this procedure, you create defensible evidence of due diligence, reduce rework and call‑backs, and support consistent training and supervision across multiple sites and crews.

Designed specifically for the Australian market, this SOP references key WHS duties, relevant Australian Standards and typical requirements from water and energy utilities. It helps you integrate safety into everyday operations, so your technicians can focus on quality workmanship while your business confidently demonstrates compliance during audits, tenders and regulator inspections.

Key Benefits

• Ensure compliant installations that align with Australian WHS legislation, plumbing and gas standards, and manufacturer requirements.
• Reduce the risk of scalding, gas leaks, electrical shock, legionella growth and water damage through clearly defined control measures.
• Standardise installation practices across all technicians, improving quality, consistency and customer satisfaction.
• Streamline onboarding and competency assessment for new plumbers, gas fitters and electricians with a clear, step‑by‑step procedure.
• Minimise costly rework, call‑backs, incident investigations and regulatory scrutiny by documenting a robust, repeatable process.

Who is this for?

• Licensed Plumbers
• Gas Fitters
• Electricians
• HVAC Technicians
• Site Supervisors
• Maintenance Managers
• WHS Managers
• Construction Project Managers
• Facilities Managers
• Strata and Property Managers

Hazards Addressed

• Scalding from incorrect hot water temperature settings or uncontrolled discharge
• Gas leaks and potential fire or explosion during gas hot water system installation
• Electric shock or arc flash from incorrect isolation or wiring of electric units
• Legionella and other microbiological risks from poorly commissioned or incorrectly set systems
• Manual handling injuries from lifting, carrying and positioning heavy cylinders and components
• Slips, trips and falls around wet surfaces, pipework, trenches and cluttered work areas
• Falls from height when installing systems on roofs, platforms or elevated plant areas
• Confined space and heat stress risks in roof cavities, plant rooms and small cupboards
• Exposure to dust, insulation fibres and other airborne contaminants in roof spaces and wall cavities
• Property damage from leaks, burst fittings or incorrect connection to pressure/temperature relief devices

Included Sections

• 1.0 Purpose and Scope
• 2.0 References, Standards and Legislative Requirements
• 3.0 Definitions and System Types (Electric, Gas, Solar, Heat Pump)
• 4.0 Roles, Responsibilities and Competency Requirements
• 5.0 Required Licences, Permits and Notifications
• 6.0 Tools, Equipment and Materials Checklist
• 7.0 Personal Protective Equipment (PPE) Requirements
• 8.0 Pre‑Start Planning and Site Risk Assessment (SWMS/JSA)
• 9.0 Service Isolation, Lockout/Tagout and Verification of De‑energisation
• 10.0 Removal and Decommissioning of Existing Hot Water Systems
• 11.0 Manual Handling and Safe Positioning of New Units
• 12.0 Plumbing Connections: Cold Supply, Hot Outlet and Discharge Lines
• 13.0 Gas Connection and Leak Testing (for Gas Systems)
• 14.0 Electrical Connection, Earthing and Compliance Checks (for Electric/Heat Pump Systems)
• 15.0 Temperature, Pressure and Expansion Control (Valves and Devices)
• 16.0 Commissioning, Functional Testing and Temperature Setting
• 17.0 Legionella Risk Controls and System Flushing Requirements
• 18.0 Working at Heights and Roof Access Controls (where applicable)
• 19.0 Housekeeping, Waste Management and Environmental Considerations
• 20.0 Documentation, Compliance Certificates and Handover to Client
• 21.0 Training, Supervision and Competency Verification
• 22.0 Incident Reporting, Non‑Conformance and Corrective Actions
• 23.0 Review, Audit and Continuous Improvement of the SOP

Legislation & References

• Work Health and Safety Act 2011 (Cth) and equivalent state and territory WHS legislation
• Work Health and Safety Regulations 2011 (Cth) and state/territory equivalents
• AS/NZS 3500 Plumbing and drainage series
• AS/NZS 3000: Electrical installations (Wiring Rules)
• AS/NZS 5601.1: Gas installations – General installations
• AS 3498: Authorisation requirements for plumbing products – Water heaters and hot‑water storage tanks
• AS 4032.1: Water supply – Valves for the control of heated water supply temperatures
• AS 3814: Industrial and commercial gas-fired appliances (where applicable)
• Safe Work Australia – Managing the Risk of Falls at Workplaces Code of Practice
• Safe Work Australia – Hazardous Manual Tasks Code of Practice