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Hi RanchGirl - Thanks for viewing GE Model GDT645SMNES! Per page 5 of the Installation Guide at the following link, the hot water supply line pressure must be 20-120 PSI: https://products.geappliances.com/MarketingObjectRetrieval/Dispatcher?RequestType=PDF&Name=31-4000211-1.pdf - Normal household PSI is approximately 40 - 45. Very low pressure keeps the dishwasher from filling or filling enough. If you have any additional questions, don’t hesitate to ask. We are also happy to help at GEAppliances.com. Sue
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