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Database

This database currently includes about 300 technologies and is updated regularly. You can scroll through the entire database or you can use the search tool on the right to focus on specific types of technologies or sectors. The search tool defaults to looking for the exact phrase entered in the search box, however a broader search is possible by unchecking the 'Use exact phrase' option.
Refer to our glossary for terms and field definitions used in this database.

Current query: "Energy System: Water Heating")

7 results

CO2 Heat Pump Water Heaters

An energy-efficient electric heat pump water heating system that uses heat extracted from the air to heat water for residential use. These heat pumps use supercritical carbon dioxide as a refrigerant.

TAG Technical Score:

Energy Savings: 66%

Regional Potential: 6.74 MWh/year

ID: 389

Commercial Heat Pump Water Heaters

Remove heat from the immediate or outside atmosphere and transfer it to the water tank.

TAG Technical Score:

Energy Savings: 50%

ID: 40

Drain-Water Heat Recovery

Copper-coiled heat exchanger to recover heat from waste hot water. For showers or other domestic hot water.

TAG Technical Score:

Energy Savings: 30%

Regional Potential: 2.46 MWh/year

ID: 157

Heat Pump Water Heater-Residential Integrated Units

Heat pump water heaters (HPWHs) use a heat pump refrigeration cycle to remove heat from the surrounding air and transfer that heat at a higher temperature into the integral hot water storage tank. “Integrated Units” means that the heat pump and water heater tank are pre-m...

TAG Technical Score:

Energy Savings: 50%

Regional Potential: 2.16 MWh/year

ID: 172

Heat Pump Water Heaters for Commercial Kitchens

Heat pump water heater or reverse cycle chiller designed for use in commercial kitchens.

TAG Technical Score:

Energy Savings: 50%

ID: 292

Reverse Cycle Chiller Application in Multifamily Dwelling

A chiller that operates the refrigeration cycle in reverse in order to provide domestic hot water; also known as a heat pump water heater.

TAG Technical Score:

Energy Savings: 40%

Regional Potential: 0.02 MWh/year

ID: 233

Showerhead Thermostatic Shut-Off Valve

A thermostatic shut-off valve which reduces hot water waste by limiting flow of hot water through the showerhead until called for by the consumer.

TAG Technical Score:

ID: 627

Level	Status	Description
1	Concept not validated	Claims of energy savings may not be credible due to lack of documentation or validation by unbiased experts.
2	Concept validated:	An unbiased expert has validated efficiency concepts through technical review and calculations based on engineering principles.
3	Limited assessment	An unbiased expert has measured technology characteristics and factors of energy use through one or more tests in typical applications with a clear baseline.
4	Extensive assessment	Additional testing in relevant applications and environments has increased knowledge of performance across a broad range of products, applications, and system conditions.
5	Comprehensive analysis	Results of lab and field tests have been used to develop methods for reliable prediction of performance across the range of intended applications.
6	Approved measure	Protocols for technology application are established and approved.

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Database

Key Words and Phrases

Energy Systems

Sectors

Energy Savings Reliability

Technical Advisory Groups

TAG Technical Score

Technology ID

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