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Hot water is the number one way to gain efficiency in multifamily buildings.

The Ecosizer is a free tool designed to help manufacturers, public utilities, engineers, and policy makers, among others, understand the benefits of energy-efficient heat pump water heaters, size them for multifamily dwellings, and positively impact the environment.

More Information
how to use this tool
  1. Pick a heat pump technology.
  2. Understand the limitations of the heat pump with respect to things such as possible hot water storage temperatures and output potential at winter design conditions.
  3. Input the building design conditions, including the highest water use on the coldest day.
  4. Pick the configuration for the temperature maintenance system.
  5. Size the system! The recommended results are sized for 16 hours of compressor runtime per day.
  6. Select the actual heat pump equipment and use the curve provided to find the minimum storage volume based on the output of the equipment at design conditions. Alternatively, pick the storage volume and use the curve to find the minimum heat pump output capacity needed.

Water Temperature

Temperature Maintenance System

Swing Tank
Parallel Loop Tanks
Primary - No Recirculation

A temperature maintenance system provides hot water to the taps in a timely manner.

Watts / Apt
Hours

Load Shift

Period 1 6–10
Period 2 16–21

Select hours of day to exclude operation

Southern California Edison (“SCE”) and Sacramento Municipal Utility District (“SMUD”) provide this software program (“Ecosizer”) for the intended “educational and informational” purposes only, and none of SCE, SMUD, nor Ecotope, Inc. (“Ecotope”)—the Ecosizer developer funded by SCE and SMUD—guarantees that the information provided by the software is correct, complete, or current. While the computational results of the software may be used only for your design considerations, they should not be used for determining compliance with any applicable federal, state, or local laws or regulations. Please consult a professional to ensure accuracy for your particular requirements.

It is a condition of us allowing you free access to this Ecosizer software program that you agree to the following:

  • None of SCE, SMUD, Ecotope, 2050 Partners, Inc., nor any of their employees, directors, owners, contractors or subcontractors, will be liable for any action you take in reliance on the information provided by the software. Additionally, you understand and agree that none of SCE, SMUD, Ecotope, nor 2050 Partners, Inc., makes any warranty, express or implied; or assumes any legal liability or responsibility for the accuracy, completeness or usefulness of any data, information, method, or results disclosed in this Ecosizer software program; or represents that its use will not infringe any privately-owned rights including, but not limited to patents, trademarks or copyrights.
  • SCE, SMUD, and Ecotope are providing this information in good faith for the intended “educational and informational” purposes only.

By using the Ecosizer software program and downloading results, you agree to the above conditions, and if you provide comments and suggestions for improvements to the software program they may be used for any purpose without restriction, obligation or remuneration of any kind.