Library

Informational guide describing the design, installation, and maintenance best practices and technical considerations for integrated Heat Pump Water Heaters in single-family and multifamily new construction.

Report describing the advantages and best practices for installing heat pump water heaters (HPWH), highlighting their improved energy efficiency, reliability, and critical considerations such as condensate management, proper sizing, and optimal installation location to enhance performance and...

The Heat Pump Water Heater Installation Tool helps contractors, installers, and homeowners through the decision-making process for heat pump water heater (HPWH) product selection and installation, with a focus on overcoming installation barriers.

Report describing the significant potential for energy use reductions through heat pump water heaters, which have been a crucial part of Northwest power plans for decades and have recently achieved substantial savings with new integrated models and climate specifications.

Report describing the features, benefits, and best practices for the design and installation of heat pump water heaters in new low-rise multifamily buildings, highlighting their efficiency, reliability, and contribution to decarbonization goals.

Report describing a laboratory assessment that provides insights into space requirements and venting strategies for heat pump water heaters (HPWH) to enhance retrofit installations and provide actionable guidance for manufacturers, designers, engineers, installers, and owners.

Guide providing detailed selection and installation instructions for heat pump water heaters.

Provides consumers with general information on solar water heating systems and how to select a contractor.

Case study of new home construction in the hot-dry and mixed-dry climate zones.

Webpage listing research projects studying deep energy retrofits of homes in Florida.

Document providing a roadmap to aid Habitat for Humanity affiliates in building high performing houses by using materials and techniques that are affordable, do not add any maintenance burden, and are volunteer friendly.

Best Practices document providing an introduction to current photovoltaic and solar thermal building practices.

Report providing a collection of fact sheets describing guidance for constructing homes in wildfire zones.

Research study investigating the factors influencing consumer adoption of HEDs and evaluating the resulting electricity consumption.

A comprehensive list of all ENERGY STAR home performance programs.

Guidebook that provides information on earthquake hazards that can damage homes, the design and retrofit of earthquake resistant housing, and how to find more information on earthquake safety.

Report documenting short-term test results of the Shift House and compares the results of Passive House Planning Package and Building Energy Optimization modeling of the project.

Report on a project that enhanced the HWSIM distribution system model to more accurately model pipe heat transfer.

Article describing the factors that can lead to inefficient hot water distribution systems in homes.

Guide describing how to choose energy-efficient water heaters, including heat pump models, with tips on installation, rebates, and incentives for maximizing energy savings.

Report detailing an evaluation of Orlando Utilities Commission (OUC) residential energy efficiency demand side management (DSM) programs to assess their impacts and relative measures of energy and economic performance.

ENERGY STAR webpage describing how a heat pump water heater works.

Report presenting construction methods, building products, appliances and equipment of four single-family houses that achieve dramatic energy reductions and approach “net zero energy” use.

A report describing how to build a high-performance affordable house to achieve 30% whole house energy savings in the mixed-humid climate region.

Report describing the identification of barriers and proposed practical solutions for the design, installation, and market adoption of heat pump water heaters in new low-rise multifamily housing, focusing on studio and one-bedroom units.

Factsheet describing the performance criteria and key components of DOE Zero Energy Ready homes.

Factsheet describing the importance of building enclosures and their impact on energy efficiency.

Wildfire guidance for homes located in the wildland urban interface, focused on site design and individual pieces of the home.

Journal article presenting modeling of residential gas water heaters via dynamic simulation models to determine the effect of the pilot light on their annual energy consumption.

Article from Building Science Corporation explaining 'wash and wear buildings' that are designed to be flooded and washed out afterwards.

Report describing the performance, economics, space heating impacts, and user satisfaction of heat pump water heaters (HPWHs) in the upper Midwest, based on a field study and survey of participants in the MECA HPWH incentive program.

Fact sheet describing principles of insulating steam distribution and condensate return lines as an effective way to prevent energy loss.

Guide describing the use of a collaborative, multidisciplinary process that considers and optimizes the building as an entire system including its technical equipment and surroundings for efficient, sustainable, and cost-effective construction and operation over the building’s entire lifespan.

Report describing the objective evaluation of space conditioning interactions between heat pump water heaters and home heating systems during winter 2016-2017, revealing a smaller than anticipated impact on space conditioning loads.

This webpage provides an interactive walk-through of the installation of a heat pump water heater in a home in Massachusetts, including how-to videos of the installation, video interviews with the homeowners, installer, and utility program partners, and visual tours of the home before and after...

Report that describes BSC's Houses That Work II (HTWII) climate-specific technical resource, beginning with an overall HTWII introduction and four sections explaining the four most important hygro-thermal climate regions: Hot-Humid, Mixed-Humid, Cold, and Hot-Dry/Mixed-Dry.

Report summarizing results of testing emerging combo water heating technologies under controlled laboratory operations, that differentiate the performance of the various packaged equipment configurations being offered.

Report describing research conducted to support California’s Title 24, Part 6 Building Energy Efficiency Standards by analyzing the impact of installation location and ventilation on heat pump water heater (HPWH) performance, emphasizing the need for proper installation to maximize efficiency...

Website explaining the LEED v4.1 program and providing a portal for those who want to investigate or start a LEED project.

Webpage published by the National Fire Protection Agency (NFPA) that lists more than 300 consensus codes and standards intended to minimize the possibility and effects of fire and other risks.

Report presenting a cold climate project that examines the relationships among energy efficient single-family residential thermal enclosures, room-to-room temperature variations, and simplified space conditioning systems.

Report about a two-year study intended to document the energy performance of a house in each sub-metered area and compare the performance to modeled predictions and to assess the thermal comfort performance of the single point mini-split heat pump.

Report using a field test plan to evaluate the success of implementing energy efficiency upgrades at the community scale incorporating whole-house systems integrated measures package (SIMP).

Report identifying the target market for solar water heaters and potential pathways and cost/performance targets that must be met for these systems to realize large energy savings.

This webpage provides an interactive walk-through of the installation of a heat pump water heater in a home in Maine, including how-to videos of the installation, video interviews with the homeowners, installer, and utility program partners, and visual tours of the home before and after installation...

Guidebook providing useful examples of high performance retrofit techniques for the building enclosure of wood frame residential construction in a cold and somewhat wet climate.

Document pertaining to design and application guidance for combination space and tankless domestic hot water heating systems used in residential buildings, based on field evaluation, testing, and industry meetings.

Report describing the installation and operation of forced-air heating and domestic hot water combi systems in residential homes.

Document developed to help residential builders and retrofitters transition from tank-type water heaters to tankless water heaters.

Report summarizing a case study about the performance of three occupied homes built in 2009 in San Antonio, Texas.