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standards for appliances using gas or other petroleum fuel. Certified to applicable Canadian standards for appliances using gas or other petroleum fuel. Certified by the Uniform Plumbing Code (UPC) Certified by National Sanitation Foundation (NSF), (indoor models must use the NSF approved top guard) Energy efficiency certified by Gas Appliance Manufacturers Association (GAMA), Met the California Energy Commission (CEC) standards Approved by the Commonwealth of Massachusetts Received New York City’s Material and Equipment Acceptance (MEA) UPC EFFICIENCY HEATING CERTIFIED The models listed in this manual have received the following certifications except where noted: ATI-305-N GTS-305-NI GT-305-NI ATI-305-P GTS-305-PI GT-305-PI ATO-305-N GTS-305-NE GT-305-NE ATO-305-P GTS-305-PE GT-305-PE ATI-505-N GTS-505-NI GT-505-NI ATI-505-P GTS-505-PI GT-505-PI ATO-505-N GTS-505-NE GT-505-NE ATO-505-P GTS-505-PE GT-505-PE ATI-705-N GTS-705-NI GT-705-NI ATI-705-P GTS-705-PI GT-705-PI ATO-705-N GTS-705-NE GT-705-NE ATO-705-P GTS-705-PE GT-705-PE ATI-705A-N GTS-705-NIA AGT-705-NI ATI-705A-P GTS-705-PIA AGT-705-PI ATO-705A-N GTS-705-NEA AGT-705-NE ATO-705A-P GTS-705-PEA AGT-705-PE Approvals Certified to applicable U.S. standards for appliances using gas or other petroleum fuel. Certified to applicable Canadian standards for appliances using gas or other petroleum fuel. Certified by the Uniform Plumbing Code (UPC) Certified by National Sanitation Foundation (NSF), (indoor models must use the NSF approved top guard) Energy efficiency certified by Gas Appliance Manufacturers Association (GAMA), Met the California Energy Commission (CEC) standards Approved by the Commonwealth of Massachusetts Received New York City’s Material and Equipment Acceptance (MEA) UPC EFFICIENCY HEATING CERTIFIED The models listed in this manual have received the following certifications except where noted: ATI-305-N GTS-305-NI GT-305-NI ATI-305-P GTS-305-PI GT-305-PI ATO-305-N GTS-305-NE GT-305-NE ATO-305-P GTS-305-PE GT-305-PE ATI-505-N GTS-505-NI GT-505-NI ATI-505-P GTS-505-PI GT-505-PI ATO-505-N GTS-505-NE GT-505-NE ATO-505-P GTS-505-PE GT-505-PE ATI-705-N GTS-705-NI GT-705-NI ATI-705-P GTS-705-PI GT-705-PI ATO-705-N GTS-705-NE GT-705-NE ATO-705-P GTS-705-PE GT-705-PE ATI-705A-N GTS-705-NIA AGT-705-NI ATI-705A-P GTS-705-PIA AGT-705-PI ATO-705A-N GTS-705-NEA AGT-705-NE ATO-705A-P GTS-705-PEA AGT-705-PE 3 Water Quality and Scale Water Quality and Scale A complete water analysis and an understanding of system requirements are needed to protect the tankless water heaters and water heating systems from scale. Water analysis shows whether water is hard or soft. Hard water, unless treated, will cause scaling or liming of the heat exchanger. The rate of scaling increases with temperature and usage because calcium carbonate and other scaling compounds lose solubility (fall out of solution) at higher temperatures. For example, for every 20°F ov...

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