New and Underutilized Water Heating Technologies

The following water heating technologies are underutilized within the Federal sector. These technologies have been identified by FEMP as the most promising for Federal agency deployment. Review each technology for potential facility energy savings.

Additional information is available by clicking on the individual technology, including technology application, key factors and considerations for deployment, and points of contact.

Technology Benefits Application Weighted Score
Condensing Water Heaters (Gas) Gas water heaters that condense water out of the flue gas to achieve higher efficiencies. Applicable in most building categories with tank type water heaters. 58
Tankless Water Heaters (Gas) Water heaters that do not have a storage tank. Sold in condensing and non-condensing models. Applicable in most building categories with residential size water heaters. 50
Heat Pump Water Heaters Air-to-water heat pumps replace electric resistance water heaters. Applicable in most building categories with tank type water heaters. 48
Solar Water Heating Using solar thermal collectors to heat water. Applicable in most building categories. 41

Ranking Criteria

Ranking hinges on three major attributes derived from specific capabilities and qualities of that technology in the Federal marketplace. Each attribute is weighted and scored individually. The ultimate ranking score is a summation of scores and weightings of each attribute, such as:

  1. Federal Impact (50% weighting): Combination of energy savings potential and applicability in the Federal market.

  2. Cost Effectiveness (30% weighting): Relative cost of the implementation and average expected return typically reported in case studies as simple payback period.

  3. Probability of Success (20% weighting): Combination of the qualitative characteristics scored separately and averaged to determine probability of success. Criteria include strength of supply chain, knowledge base, implementation difficulty, and customer acceptance.