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Water Heaters, Appliances & Lighting - Appliances


Solution Center Guides


This project completed a modeling evaluation of a hybrid gas water heater that combines a reduced capacity tankless unit with a downsized storage tank. This product would meet a significant market need by providing a higher efficiency gas water heater solution for retrofit applications while maintaining compatibility with the half-inch gas lines and standard B vents found in most homes. The TRNSYS simulation tool was used to model a base case 0.60 EF atmospheric gas storage water, a 0.82 EF non-condensing gas tankless water heater, an existing (high capacity) hybrid unit on the market, and an alternative hybrid unit with lower storage volume and reduced gas input requirements.

Heat pump water heaters offer a significant opportunity to improve water heating performance for the over 40% of U.S. households that heat domestic hot water using electric resistance storage water heaters. Numerous field studies have also been completed documenting performance in a variety of climates and applications. More recent evaluation efforts have focused attention on the performance of May through September 2014, with ongoing winter monitoring being sponsored by California utility partners.

High performance water heaters are typically more time consuming and costly to install in retrofit applications, making high performance water heaters difficult to justify economically. However, recent advancements in high performance water heaters have targeted the retrofit market, simplifying installations and reducing costs. Four high efficiency natural gas water heaters designed specifically for retrofit applications were installed in single-family homes along with detailed monitoring systems to characterize their savings potential, their installed efficiencies, and their ability to meet household demands.

This measure guide describes basic steps for installing ceiling fans.

Guide describing how to install efficient clothes washers in new and existing homes.

Guide describing condensing clothes dryers, which have a secondary heat exchanger and do not require exterior venting.

Guide describing how to install dishwashers in new and existing homes.

Guide describing how to install ENERGY STAR rated dishwasher and clothes washers. 

Guide describing how to provide combustion air for fireplaces and how to test fireplaces for combustion safety.

Guide describing how to conduct a home performance assessment before beginning retrofit projects in existing homes.

Guide describing how to install and test all water-using fixtures, equipment, and appliances to ensure there are no leaks.

Retrofit guide describing how to assess harmful gasses such as carbon monoxide, sulfur oxides, nitrogen oxides, and soot from existing combustion appliances.

Guide describing how to correctly vent a clothes dryer.

Guide describing how to install energy efficient refrigerators in new and exisitng homes.

Install Tier 1, master-slave, load-sensing advanced power strips in entertainment centers and computer stations.

Guide describing how to properly ventilate un-vented combustion appliances such as sealed fireplaces.

Guide describing replacement of a single-speed pool pump with variable-speed pump.