This presentation outlines the key considerations necessary for selecting appropriately sized CHPWH systems. It also showcases Ecotope's new Ecosizer tool.

1. How to Select and Design a Centralized
Heat Pump Water Heating System
Colin Grist, PE,
Ecotope, Inc.

2. Key Design Considerations
● HPWH sizing considerations &
tools
● Ecosizer:
(https://ecosizer.ecotope.com)

3. Central HPWH System Sizing
55 Tons
1,000 Gallons
5 Tons
520 Gallons

4. Domestic Hot Water Load
• Hot water load defined by:
• the number of occupants
• how much hot water
they use
• At the Design Conditions
(cool air and water temperatures)

5. Ecosizer
ecosizer.Ecotope.com

6. Central HPHW System Sizing
Don’t forget about defrost!
Manufacturer's nominal heat capacity
vs.
Heat capacity at design air conditions

7. Questions?

8. Upcoming training and
resources
To host a training session, or for more information, contact:
Lauren Bhaskar at: lbhaskar@drintl.com
PG&E 2021
(pge.docebosaas.com/learn)
Central Heat Pump Water Heating: Engineering
Design Deep Dive (4-hour seminar)
Central Heat Pump Water Heating for Multi-family
Design and Operation (2-hour seminar)
Central Heat Pump Water Heating for Hospital and
Clinical Settings (2-hour seminar)
SDGE 2021 (sdge.com/energy-
innovation-center/education-
training)
Central Heat Pump Water Heating: Engineering
Design Deep Dive (4-hour seminar)

9. Thank You

10. Thank You to our Collaborators