PRESS RELEASE

    IAPMO’s Water Demand Calculator™ Version 2.2 Available for Download

    IAPMO’s Water Demand Calculator™ Version 2.2 Available for Download

    The International Association of Plumbing and Mechanical Officials (IAPMO®) is excited to announce that the Water Demand Calculator™ version 2.2 is now available for download.

    While the basic template of version 2.1 of the calculator remains intact, version 2.2 includes several new features. First, version 2.2 implements a new algorithm called the method of convolution to replace exhaustive enumeration. The new algorithm is faster and has a smoother transition to the other methods of computation. This new computation method assures accurate predictions of peak indoor water demand.

    A second new feature of the Water Demand Calculator version 2.2 is the enhanced display showing the method of computation. After running the Water Demand Calculator, a new box in the computed results column shows the exact algorithm used in the calculation.

    A third new feature of version 2.2 is that the results of the peak flow calculation are now downloaded in a Microsoft Excel spreadsheet rather than a text file. The spreadsheet displays all the results and the list of fixtures and fixture counts entered into the calculation. In addition, an updated user guide is also available for version 2.2.

    “The Water Demand Calculator has become more robust while remaining fast, accurate and user-friendly,” said Dan Cole, IAPMO’s senior director of Technical Services. “Increasing the accuracy in predicting peak water demand for single- and multifamily dwellings will lead to reductions in pipe sizing accompanied by additional cost savings.”

    The Water Demand Calculator version 2.2 and user guide may be downloaded HERE. For specific information about the Water Demand Calculator or to provide feedback, please contact Dan Cole at dan.cole@iapmo.org.

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    13 October 2025

    A first-of-its-kind workshop for African World Plumbing Council (WPC) member organizations was held alongside the WorldSkills Africa 2025 capacity-building program for Plumbing, hosted at the Fountain Gate Craft & Trades School in Lusaka, Zambia, from Sept. 1-5. This workshop assembled a team of proactive WPC representatives from Zambia, South Africa, and Rwanda for a first in-person meeting of WPC member organizations on the continent. 

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    09 October 2025

    ASSE International is seeking working group members to update four professional qualification standards: ASSE 13000 Standard for Service Plumber and Residential Mechanical Service Technician; ASSE 15000 Standard for the Inspection, Testing and Maintenance of Water-Based Fire Protection Systems; ASSE 27000 Standard for Hybrid Fire Extinguishing Systems Personnel; and ASSE 29000 Standard for Personnel Related to Safe Pressure Testing of Piping Systems.

    IAPMO Solicits Public Comments for 2027 WE•Stand, USHGC, USPSHTC

    08 October 2025

    IAPMO®, publisher of the Water Efficiency and Sanitation Standard (WE•Stand), Uniform Solar, Hydronics and Geothermal Code (USHGC) and Uniform Swimming Pool, Spa and Hot Tub Code (USPSHTC), is calling for public comments on the 2025 Report on Proposals (ROP) for the 2027 editions of these model codes, the preceding editions of which are American National Standards.

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