Purity and performance, perfected. Hubbell Ultrapure D is our storage water heater for RO/DI or pure water applications. It’s purpose-built for systems requiring large draws of hot deionized water with a fixed period between cycles. Storage capacity reduces peak power demand in heavy-duty industrial applications. Long operating life with corrosion resistant 316L stainless steel heating element and vessel. Versatile and upgradable sizing for your exact needs. Packaged with all electrical operating controls for simple installation and operation.