The Washington Pre-instruction Checklist for Hot Water Heating or Hot Water Supply Boilers is a comprehensive document that is used by inspectors to ensure the safety and efficiency of hot water heating or hot water supply boilers in the state of Washington. This checklist covers a variety of topics related to the operation of hot water heating or hot water supply boilers, including the following: • Boiler construction and installation: This includes verifying that the boiler is installed according to the manufacturer’s instructions and meets all applicable safety regulations. • Boiler operation: This includes verifying that the boiler is operated in accordance with the manufacturer’s instructions and that all safety features are functioning properly. • Boiler maintenance: This includes verifying that the boiler is maintained according to the manufacturer’s instructions and that all safety features are functioning properly. • Boiler combustion: This includes verifying that the boiler is burning fuel safely and efficiently. • Boiler temperature control: This includes verifying that the boiler is maintaining the correct temperature and pressure for the application. • Boiler water: This includes verifying that the boiler water is free of contaminants and is within the manufacturer’s recommended parameters. There are two different types of Washington Pre-instruction Checklist for Hot Water Heating or Hot Water Supply Boilers: the Standard Checklist and the Enhanced Checklist. The Standard Checklist is used for boilers that are installed in residential settings, while the Enhanced Checklist is used for boilers that are installed in commercial or industrial settings.