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The RTF is a technical advisory committee to the Northwest Power and Conservation Council established in 1999 to develop standards to verify and evaluate energy efficiency savings

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primary-menu Calendar Work products UES Measures list Standard protocols list Supporting documents Propose a measure or standard protocol Proposed measures and status Whole Building Efforts Subcommittees Subcommittees Agricultural Irrigation Air Source Heat Pumps C&I Fans Subcommittee Climate Zone Subcommittee Clothes Washer and Dryer Connected Thermostats Demand Response Ductless Heat Pumps Guidelines Heat Pump Water Heaters Implementers Group Market Analysis Natural Gas Subcommittee New Homes Standard Protocol Non-Residential Lighting Operations Pump Systems Research and Evaluation Residential Behavior Residential Lighting RTF Policy Advisory Committee Secondary Glazing Systems SEEM Calibration and Measure Interaction Small and Rural Utilities Statistical Methods Whole Building Subcommittee Site menu Site menu Search Home Residential Heat Pump Water HeatersClose Navigation Home Calendar News & updates Decisions Guidelines About the RTF RTF Membership – 2019-2021 Work plan and budget Request for proposals Charter and bylaws Conflict of interest policy RTF Policy Advisory Committee Contacts Conservation achievements Work products UES Measures list Standard protocols list Supporting documents Propose a measure or standard protocol Proposed measures and status Whole Building Efforts Subcommittees Agricultural Irrigation Air Source Heat Pumps C&I Fans Subcommittee Climate Zone Subcommittee Clothes Washer and Dryer Connected Thermostats Demand Response Ductless Heat Pumps Guidelines Heat Pump Water Heaters Implementers Group Market Analysis Natural Gas Subcommittee New Homes Standard Protocol Non-Residential Lighting Operations Pump Systems Research and Evaluation Residential Behavior Residential Lighting RTF Policy Advisory Committee Secondary Glazing Systems SEEM Calibration and Measure Interaction Small and Rural Utilities Statistical Methods Whole Building Subcommittee nwcouncil.org Contact Close Navigation Home Toggle Siblings Residential Heat Pump Water Heaters UES MeasureResidential Heat Pump Water HeatersAt a GlanceCategory  proven, planning Status  active Fuel type  electric Sector  residential Applications  DHW Sunset date Dec 31, 2024

Heat pump water heaters save energy by using ambient heat to raise the temperature of water, rather than relying solely on electric resistance heat such as with a conventional electric storage water heater. The measure workbook for this measure contains measures for HPWHs installed in garages, basements, inside homes, and a measure identifier for HPWHs in "any location" for savings estimates where programs may not know where the end-user chose to place the technology.  At its April 2020 meeting, the RTF acknowledged that heat pump water heaters will be occasionally installed in commercial buildings where programs are designed with a retail delivery mechanism and with no tracking of the HPWH's installation location.  Continued use of "residential" measures are valid in these cases.  

WorkbookLatest Version Residential Heat Pump Water Heater v4.2 File Residential Heat Pump Water Heater v4.2 Measure as approved at the January 2018 RTF Meeting. Minor error corrected on the Measure Table. Only impacted measure name reference and did not have any impact on savings, costs, or lifetimes. Date Jun 26, 2019Version number  4.2 Past Versions
version date document
4.1
Apr 19, 2018
File Residential Heat Pump Water Heater v4.1
QC review complete.
4.0
Feb 9, 2018
File ResHPWH_v4_0.xlsm
Workbook version approved at the January 2018 RTF Meeting. Undergoing QC.
3.4
Apr 5, 2017
File ResHPWH_v3_4.xlsm
QC review complete.
3.3
Nov 17, 2016
File ResHPWH_v3_3.xlsm
Updated with changes adopted at the November 2016 RTF Meeting. Currently undergoing QC.
3.2
Jun 29, 2016
File ResHPWH_v3_2.xlsm
Updated to 7th Plan assumptions and format. Currently undergoing QC.
3.1
Sep 11, 2015
File Res_HPWH_v3_1.xlsm
QC Review Complete
3.0
Jul 28, 2015
File Res_HPWH_v3_0.xlsm
Currently undergoing QC
2.2
Mar 19, 2015
File Res_HPWH_v2_2.xlsm
Original savings workbook. QC review complete
2.0
Nov 21, 2014
File Res_HPWH_v2_0.xlsm
Original savings workbook. Currently undergoing QC
1.3
Jan 13, 2014
File Res_HPWH_v1_3.xlsm
Fixed small error in lookup table.
1.2
Mar 13, 2012
File Res_HPWH_v1_2.xlsm
Added tier 2 units for ducted interior installations.
1.0
Oct 21, 2011
File Res_HPWH_v1_0.xlsm
Original savings workbook.
Supporting Documents Heat Pump Water Heater Any Install Location Research Strategy January 2018 File Heat Pump Water Heater Any Install Location Research Strategy January 2018 Research Strategy for the Tier 4, No Resistance, Split-System HPWH for Single Family and Manufactured Homes File Research Strategy for the Tier 4, No Resistance, Split-System HPWH for Single Family and Manufactured Homes DecisionsLatest decisionDecision detailsDecided January 20, 2021 RTF Meeting: January 20, 2021 Approved Measure Updates

Adopt the updates as presented to the existing home residential HPWH UES measure applications;

Keep the Category Proven for all non-split system applications and Planning for all split-system applications;Keep the Status at ActiveChange the Sunset Date to December 31, 2024 Decided January 30, 2018 RTF Meeting: January 30-31, 2018 Approve Measure Updates

Adopt the updates as proposed for the existing residential Heat Pump Water Heater measure applications:

Change the Category to ProvenKeep the Status at ActiveChange the Sunset Date to January 31, 2021Decided January 30, 2018 RTF Meeting: January 30-31, 2018 Adopt New Measure Applications

Adopt the new Residential Heat Pump Water Heater UES measure applications as proposed for "Any Vintage/Any Install Location":

Update the Research Strategy to reflecthigher estimated cost binmaking the permit review an alternate candidate approachhave market data collection to include sectors outside of single family homesUpdate HVAC weight distribution for new construction branch to reflect only homes with electric water heatingSet the Category to PlanningSet the Status at ActiveSet the Sunset Date to January 31, 2021Decided November 9, 2016 RTF Meeting: November 9, 2016 Approve new measure application

Adopt the Tier 4, No Resistance, Split-System Heat Pump Water Heaters for Single Family and Manufactured Homes UES measure specification, savings, cost, life, and Research Strategy as proposed (assume any size tank for hot water use),

Individual Application Category: Planning Individual Application Status: ActiveIndividual Application Sunset Date: November 30, 2019

Note: This measure application was adopted with a category and sunset date that differ from other measure applications included in this measure workbook. 

Decided November 9, 2016 RTF Meeting: November 9, 2016 Approve measure updatesUpdate the retrofit measure to reflect the latest market mix;Set the sunset date for the HPWH UES measures to January 31, 2018;Add to the measure specification for all current HPWH UES measures that the pre-existing water heater type must be electric;Adopt the HPWH UES measures with the identifier "any installation location" as proposed, with the same category (Planning), status (Active), and sunset date (January 31, 2018) as the existing HPWH measures;Accept the Research Plan for HPWH UES measures and change the category of the measure from Planning to ProvisionalDirect staff to work with the PAC on the fuel switching question;Direct staff to work with a subcommittee on developing an upstream planning measure and related research strategyDecided July 19, 2016 RTF Meeting: July 19, 2016 Sunset date extension

Extend the sunset date of the Residential Single Family and Manufactured Home HPWH UES measure to December 31, 2016.

Decided July 21, 2015 RTF Meeting: July 21, 2015 Approve measure update

For the Residential Single Family and Manufactured Home HPWH UES measure:Approve the measure updates as presented, with small/large tank baseline, combined any tank baseline, updated costs and savings, and a new Tier 3 measure; Adopt the revised research strategy; Keep the Category at Planning; Change the Status to Active; Set the sunset date to 7/31/2016.

Decided April 14, 2015 RTF Meeting: April 14, 2015 Change measure status to under review

For the Residential Single Family and Manufactured Home HPWH measure, accept the research strategy for the HVAC interaction parameter; change the Category to 'Planning'; change the Status to 'Under Review'; Set the sunset date to 12/31/2015.

Research Strategy for HVAC interaction is needed

Decided November 18, 2014 RTF Meeting: November 18, 2014 Approve measure update with direction for future analysis

Update the savings, cost, and life for the HPWH UES measures as proposed and set the measure to Provisional category and Under Review status. Direct staff to develop research plan focused on:

HVAC interaction factor, using a combination of a PNNL lab homes study and an engineering study, as proposed;and Determining baseline using data on existing tank size, sales data, and possibly survey data.

Set the sunset date to 4/2015, at which time the RTF will review the research plan.

Decided February 14, 2012 RTF Meeting: February 14, 2012 Approve measure update with direction for future analysis

The RTF approved the addition of Tier 2, Ducted Interior Installations to the Heat Pump Water Heaters UES Measure under provisional status with a sunset date of December 31st, 2014.

RTF subcommittee will assist with the development of the HPWH savings research. NEEA will be developing an installation specification to achieve 200 CFM exhaust airflow.

Decided October 4, 2011 RTF Meeting: October 4, 2011 Approve Measure Update with Direction for Subcommittee

Approved the Heat Pump Water Heater UES Measure, as revised during the meeting, under provisional status to include Tier I systems in all applications and Tier II In buffered unconditioned spaces (interior applications expected at a later date), with the assumed cost of the GE Unit set at $1,200 and overall measure cost adjusted accordingly, and with the study design directed by an RTF sub-committee, and a sunset date of December 31, 2014 

Small/rural checklistLatest Version February 2015 HPWHs Small/Rural Checklist File February 2015 HPWHs Small/Rural Checklist Date Feb 18, 2015Past Versions
version date document
Jan 30, 2015
File HPWHs_SmallRuralUtilitiesUESDesignChecklist 1.29.15 v1.xlsx
Archived Documents Residential HPWH Research Plan (2016) File Residential HPWH Research Plan (2016) Sanden_HPWH_simulations.xlsx File Sanden_HPWH_simulations.xlsx Res-HPWH-7P_v4.xlsx File Res-HPWH-7P_v4.xlsx heat_exchange_functions.xlsx File heat_exchange_functions.xlsx Archives ELCAP Conservation achievements An advisory committee of: Northwest Power & Conservation Council ©2021 Regional Technical Forum. All Rights Reserved. randomness
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