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Library

This library contains research reports produced by the Building America program and other building science resources used to support this Solution Center. The materials cover both new construction and existing homes. Use the search box and/or the filters to explore hundreds of residential building resources. Access to some references not produced by Building America may require purchase from the publisher. Documents are listed alphabetically. While we continually update our database, links may have changed since posting. Please contact our webmaster if you find broken links.

Showing results 1 - 50 of 99

Whole Home Tankless Gas Water Heaters

Author(s)
ENERGY STAR
Organization(s)
ENERGY STAR
Publication Date
Wepage providing information on ENERGY STAR certified gas tankless water heaters with information on how they cut water heating expenses as well as a product finder tool to find ENERGY STAR certified products.

ENERGY STAR® Certified Heat Pump Water Heaters Sales Guide

Author(s)
ENERGY STAR
Organization(s)
U.S. Department of Energy,
DOE,
U.S. Environmental Protection Agency,
EPA
Publication Date
Informational guide describing the benefits, functionality, and cost savings of ENERGY STAR® certified heat pump water heaters, addressing common misconceptions and highlighting incentives.

Water Heating

Author(s)
BetterBricks
Organization(s)
Northwest Energy Efficiency Alliance,
NEEA
Publication Date
Website containing useful resources regarding central heat pump water heater systems.

Commercial HPWH Qualified Products List

Author(s)
Northwest Energy Efficiency Alliance
Organization(s)
NEEA
Publication Date
List of multifamily commercial heat pump water heater products that meet the NEEA Advanced Water Heating Specification Requirements.

Building Science Education: Heat Pump Water Heater Training Module

Author(s)
U.S. Department of Energy
Organization(s)
DOE
Publication Date
Training module describing the operation, efficiency, consumer and seller benefits, and cost comparison of Heat Pump Water Heaters (HPWH) against conventional gas, oil, or electric water heaters.

Heat Pump Water Heater Installation Tool

Author(s)
Pacific Northwest National Laboratory
Organization(s)
U.S. DOE
Publication Date
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.

Washington State Energy Code - WSEC

Author(s)
Washington State Building Code Council
Organization(s)
Washington State Department of Enterprise Services
Publication Date
State building energy code for the State of Washington.

Interactive Walk-Through of a Residential Heat Pump Water Heater Installation in Massachusetts

Author(s)
D+R Learn,
Northeast Energy Efficiency Partnerships,
Home Works Energy Inc.,
U.S. Department of Energy
Organization(s)
DOE
Publication Date
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...

Maine Heat Pump Water Heater (HPWH) Interactive Tour

Author(s)
D+R Learn,
Northeast Energy Efficiency Partnerships,
Home Works Energy Inc.,
U.S. Department of Energy
Organization(s)
DOE,
NEEP
Publication Date
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...

Laboratory Testing of Heat Pump Water Heater Performance: Impact of Airflow and Space Configurations

Author(s)
Larson Ben,
Larson Sam,
Gantley Maya
Organization(s)
Pacific Gas and Electric Company,
PG&E,
Energy Transition Coordinating Council,
ETCC
Publication Date
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...

Best Practices for the Retrofit Installation of Heat Pump Water Heaters

Author(s)
Richard Health & Associates
Organization(s)
RHA
Publication Date
Report describing the best practices for the safe, efficient, and compliant installation of residential air source heat pump water heaters (HPWH) in California, aligning with the state's climate goals and providing guidance for educators, installers, and industry stakeholders.

Central Heat Pump Water Heater Design Guide

Author(s)
Ecotope
Organization(s)
Energy Trust of Oregon
Publication Date
Design guide providing solutions and tools for designing central heat pump water heater systems in multifamily and other commercial buildings.

HPWH Installation and Design Concepts for Low-Rise Multifamily Buildings

Author(s)
Larson Ben
Organization(s)
Larson Energy Research,
Northwest Energy Efficiency Alliance,
NREL
Publication Date
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.

Getting to All-Electric Multifamily Zero Net Energy Construction

Author(s)
Dryden Amy,
Brooks Andrew,
Duff Meghan,
Pfotenhauer Greg,
Stone Nehemiah,
Armstrong Sean,
Higbee Emily
Organization(s)
California Energy Commission
Publication Date
Report describing the cost-effectiveness and performance of all-electric, zero net energy multifamily buildings in California, detailing technical challenges and providing recommendations for design, construction, codes, standards, and operations to support future projects.

How it Works - Heat Pump Water Heaters (HPWHs)

Author(s)
ENERGY STAR
Organization(s)
U.S. Environmental Protection Agency,
EPA
Publication Date
ENERGY STAR webpage describing how a heat pump water heater works.

Plug-In Heat Pump Water Heater Field Study Findings & Market Commercialization Recommendations

Author(s)
Khanolkar Amruta,
Egolf Mischa,
Gabriel Noah
Organization(s)
New Buildings Institute,
NBI
Publication Date
Report describing the key findings from the first third-party field validation of 120-volt heat pump water heater (HPWH) technology, addressing the significant barriers to their adoption and emphasizing their potential role in reducing carbon emissions from residential water heating.

CEE Residential Product Directory

Author(s)
Consortium for Energy Efficiency; Air-Conditioning,
Heating,
and Refrigeration Institute
Organization(s)
CEE; AHRI
Publication Date
AHRI-hosted directory of residential products meeting CEE's highest tier

Heat Pump Water Heaters in Small Spaces Lab Testing: “The Amazing Shrinking Room”

Author(s)
Larson Sam,
Larson Ben
Organization(s)
Northwest Energy Efficiency Alliance,
NEEA,
Cascade Engineering Services,
Larson Energy Research
Publication Date
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.

Plug-In Heat Pump Water Heaters: An Early Look to 120-Volt Products

Author(s)
Larson Ben,
Larson Sam
Organization(s)
Larson Energy Research,
Northwest Energy Efficiency Alliance,
NEEA
Publication Date
Report describing a laboratory assessment on the performance of Rheem 120-volt heat pump water heaters (HPWH), aimed at identifying optimal installation locations for these new "plug-in" models based on comprehensive testing under various conditions.

Evaluation of Unitary Heat Pump Water Heaters with Load-Shifting Controls in a Shared Multifamily Configuration

Author(s)
Hoeschele Marc,
Haile James,
Grant Peter
Organization(s)
Pacific Gas and Electric Company,
PG&E,
Energy Transition Coordinating Council,
ETCC
Publication Date
Report describing the performance, cost, and carbon impacts of unitary heat pump water heaters with load-shifting controls in a shared configuration for a multi-family project, highlighting significant savings in energy usage, CO2 emissions, and utility costs.

Advanced Water Heating Specification Version 8.0.

Author(s)
Northwest Energy Efficiency Alliance
Organization(s)
NEEA
Publication Date
Specification sheet for residential, commercial, multifamily, and industrial water heaters and heating systems.

Advanced Water Heating Specification

Author(s)
Northwest Energy Efficiency Alliance
Organization(s)
NEEA
Publication Date
Specifications for water heating systems designed to advance higher performing electric and gas heat pump water heaters.

Understanding HPWH Interaction with Space Conditioning Systems in the Field

Author(s)
Larson Ben
Organization(s)
Ecotope,
American Council for an Energy-Efficient Economy,
ACEEE
Publication Date
Presentation report detailing Heat Pump Water Heater (HPWH) interaction with space conditioning systems in real-life test scenarios that explains some of the problems arising from these interaction and information that can be used to make the system more efficient.

Installed Performance of Heat Pump Water Heaters in a Cold Climate

Author(s)
Cautley Dan,
Gries Kevin,
Cacko Dianna,
Margolies Justin
Organization(s)
Slipstream
Publication Date
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.

2018 International Plumbing Code - IPC

Author(s)
International Code Council
Organization(s)
ICC
Publication Date
2018 edition of code establishing minimum regulations for plumbing facilities, including fixtures, water heaters, water supply and distribution, sanitary drainage, storm drainage, etc.

2015 International Plumbing Code - IPC

Author(s)
International Code Council
Organization(s)
ICC
Publication Date
2015 edition of code establishing minimum regulations for plumbing facilities, including fixtures, water heaters, water supply and distribution, sanitary drainage, storm drainage, etc.

Water Heater Key Product Criteria

Author(s)
ENERGY STAR
Organization(s)
ENERGY STAR
Publication Date
A info sheet providing information on ENERGY STAR certified water heaters and the various criteria water heaters must undergo to become ENERGY STAR certified, including metrics on efficiency and performance.

Sizing a New Water Heater

Author(s)
U.S. Department of Energy
Organization(s)
DOE
Publication Date
A website providing information on how to properly size a water heater based on tank size, volume, peak hour demand and other factors.

Fixing an Expansion Tank with Excess Water

Author(s)
PEX Universe
Organization(s)
PEX Universe
Publication Date
A webpage discussing how water heater expansion tanks operate and how to repair them.

Ecosizer Sizing Tool

Author(s)
Ecotope
Organization(s)
Ecotope
Publication Date
Free online tool for sizing central heat pump water heater systems.

Earthquake Country Alliance: Water Heater

Author(s)
Earthquake Country Alliance,
Southern California Earthquake Center
Organization(s)
ECA,
SCEC
Publication Date
Factsheet describing how to secure water heaters to resist seismic activity.

Securing Your Water Heater

Author(s)
Washington State Department of Health
Organization(s)
Washington State Department of Health
Publication Date
A fact sheet providing homeowners with guidance on properly securing water heaters to prevent them from tipping in an earthquake.

Gas-fired Water Heaters, Volume III, Storage Water Heaters with Input Ratings Above 75,000 Btu per Hour, Circulating and Instantaneous (ANSI Z21.10.3:19/CSA 4.3:19)

Author(s)
American National Standards Institute
Organization(s)
ANSI,
CSA Group
Publication Date
Standard that applies to storage water heaters, instantaneous water heaters, and circulating water heaters including booster water heaters; the current version of this standard was published in the year 2019 and it is available for purchase along with a digital preview on the ANSI webstore page.

2012 International Plumbing Code - IPC

Author(s)
International Code Council
Organization(s)
ICC
Publication Date
2012 edition of code establishing minimum regulations for plumbing facilities, including fixtures, water heaters, water supply and distribution, sanitary drainage, storm drainage, etc.

2009 International Plumbing Code - IPC

Author(s)
International Code Council
Organization(s)
ICC
Publication Date
2009 edition of code establishing minimum regulations for plumbing facilities, including fixtures, water heaters, water supply and distribution, sanitary drainage, storm drainage, etc.

Heat Pump Water Heater Installation Best Practices Guide

Author(s)
Hot Water Solutions NW,
Northwest Energy Efficiency Alliance
Organization(s)
HWS NW,
NEEA
Publication Date
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 HPWH Handbook: Optimum Installation Practices and Answers to Lingering Research Questions

Author(s)
Widder Sarah H,
Larson Ben
Organization(s)
American Council for an Energy Efficient Economy,
ACEEE,
Cadeo Group LLC,
Ecotope Inc.
Publication Date
Conference paper summarizing the relative performance of currently available Heat Pump Water Heaters (HPWH) models, the energy implications of different installation locations (garage, basement, or conditioned space) and ducting configurations (exhaust ducting, full ducting, or no ducting), as well...

2009 International Fuel Gas Code - IFGC

Author(s)
International Code Council
Organization(s)
ICC
Publication Date
2009 edition of code establishing a baseline for the design and installation of fuel gas systems and gas fired appliances through performance requirements.

Interaction between Heat Pump Water Heaters or Other Internal Point Source Loads and a Central Heating System

Author(s)
Widder Sarah H,
Metzger Cheryn E,
McIntosh Joshua A,
Petersen Joseph M
Organization(s)
Northwest Energy Efficiency Alliance,
NEEA,
Pacific Northwest National Laboratory,
PNNL
Publication Date
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.

Measure Guideline: Combined Space and Water Heating Installation and Optimization

Author(s)
Bohac Dave,
Schoenbauer Ben,
Huelman Patrick H
Organization(s)
NorthernSTAR Building America Partnership,
NorthernSTAR,
University of Minnesota,
UMN
Publication Date
Report describing the installation and operation of forced-air heating and domestic hot water combi systems in residential homes.

Multifamily Heat Pump Water Heater Evaluation

Author(s)
Alliance for Residential Building Innovation,
National Renewable Energy Laboratory
Organization(s)
ARBI,
NREL
Publication Date
Study in which a central heat pump water heater system was monitored in detail and used to create a model for assessing similar systems in various climates.

Mechanical Insulation Design Guide - Installation

Author(s)
National Mechanical Insulation Committee
Organization(s)
NMIC
Publication Date
Web resource that lays out the pre-work considerations, methods and finishes for installing mechanical insulation.

Combined Space and Water Heating: Next Steps to Improved Performance

Author(s)
Bohac Dave,
Schoenbauer Ben,
Huelman Patrick H
Organization(s)
University of Minnesota,
UMN,
NothernSTAR,
NSTAR,
U.S. Department of Energy,
DOE
Publication Date
Report describing combined space- and water-heating (combi) systems using a high-efficiency direct-vent burner.