This code lists six safety features every hot water boiler must have:
Characteristics of boiler feedwater - Lenntech
The Federal Energy Management Program (FEMP) provides information about energy-efficient products and energy-saving technologies that can help agencies meet federal energy-efficient product purchasing requirements. Calculators estimate savings for heating and cooling equipment, lighting, food service appliances, and water fixtures. Learn more.
ENERGY STAR® is the simple choice for energy efficiency. For more than 20 years, EPA's ENERGY STAR program has been America's resource for saving energy and protecting the environment.
Purchasing Energy-Efficient Residential Gas Boilers | Department of Energy
Boiler Feed Water and Boiler Water - EWT Water Technology
Boiler Operator: Job Description, Duties and Requirements
Best Boiler Buying Guide - Consumer Reports
Department of Labour, Government of Jammu & Kashmir