A circulator savings calculator from the Hydraulic Institute (HI) is a free tool for users to estimate energy savings and financial payback from efficient circulator pump selection.

The calculator utilizes data from HI’s public Energy Rating database, er.pumps.org, to provide up-to-date savings calculations based on currently listed circulator models. The calculator estimates the energy savings for specific circulator pumps and hot water recirculation pumps. Users have two options to calculate savings, with information from an HI Energy Rating Label or by entering size and control types. Users also are able to use defaults or customize aspects of the calculator, including operation hours, to give the most accurate estimates.

The HI Energy Rating database is available to the public to search for energy-efficient industrial pumps and circulator pumps that are within the scope described in HI 40.5-Program Guideline for HI Energy Rating Program and HI 41.5-2022 Program Guideline for Circulator Pump Energy Rating Program.