Technical reviews of ENERGY STAR gas boilers can be found on the Environmental Protection Agency's ENERGY STAR certification program website. User reviews for gas boilers certified as ENERGY STAR products are available on the product pages on Amazon.com. ConsumerSearch also has recommendations based on its analysis of reviews.
The reviews on Amazon.com are available for the offered models of gas boilers and include starred rankings and user comments. The product pages also offer a question-and-answer section for commonly asked questions about the model.
ConsumerSearch.com offers a buying guide for selecting an ENERGY STAR gas boiler, along with reviews for select models. The site examines the appropriate type of model for different buildings and explains how to choose an energy-efficient model based on the climate. The site suggests sources with additional information, such as the American Council for an Energy Efficient Economy, The Family Handyman, HGTV, This Old House and HomeEnergyPros.
The government ENERGY STAR website gives a short description of the different models' features. Technical specifications, as tested and verified by the program, include information on the most efficient products featured, capacity, annual fuel utilization efficiency, estimated annual cost of the unit, estimated lifetime operating cost and overall savings the energy efficiency provides.