WebVII. SIZING REQUIREMENTS FOR TANKLESS/INSTANTANEOUS WATER HEATERS A. INTRODUCTION 1. Tankless (instantaneous) water heaters produce hot water by passing water through a heat exchanger. For proper heating of the water, water must flow through the tankless water heater slowly to allow for adequate heat transfer from the heat … WebA 12-inch gas pipe may be utilized in certain circumstances. A 3.0 in. w.c. pressure drop chart was included to the 2012 National Fuel Gas Code (NFPA54. ANSI Z223.1) for specified conditions. This chart shows how …
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