The Ecosizer is a free tool for sizing central water heating systems based on commercial heat pump water heaters (CHPWHs) in multifamily and commercial buildings. The tool is designed to support the building industry to adopt CHPWHs to improve energy efficiency and reduce greenhouse gas emissions.
The Ecosizer is also intended to provide educational information on CHPWH system designs to other stakeholders, for example energy efficiency and building decarbonization advocates, program administrators and implementors, building science researchers, manufacturers, and policy makers.
The sizing method used by the Ecosizer was developed in 2020 by Ecotope, Inc. and provides a significant improvement to the ASHRAE sizing method for water heating systems. The Ecosizer method accounts for hot water production during periods of peak demand from building occupants. This approach allows the system to be sized smaller than the ASHRAE method.