Written on: December 20, 2022 by ICM
The newly upgraded line of EZ Series of Residential Condensing Tankless Water Heaters from Noritz America offers an improved Uniform Energy Factor (UEF) of 0.96, and offers a 25-year warranty. The higher UEF deliver energy savings and lower monthly fuel bills to the home or business owner over the extended life of these highly durable water heaters, Noritz said.
The key to both the warranty and the efficiency gain—up from 0.95 UEF for the previous EZ Series—is a unique blend of two types of high-grade stainless steel in the heat exchangers, using the material that best supports each component’s function. The primary heat exchanger is made of a higher tensile strength stainless material to resist heat shock and cracking under the high temperatures it routinely handles. The secondary exchanger extracts latent heat from the combustion process, producing an acidic condensate. As a result, it features a stainless material that is especially adept at resisting corrosion and scale buildup, even after years of demanding usage, Nortiz said.
The upgraded EZ Series also offers an industry-first, according to Noritz: a Steady BTU (SBTU) Mode that eliminates concerns over high incoming water temperatures, particularly in warmer regions of the country. Both EZ models, the EZ98DV and the EZ111DV, have minimum BTU per hour outputs of 18,000. But the series’ breakthrough, burner-control technology reduces the effective minimum input, by more than two thirds, to under 5,000 BTU per hour whenever incoming water temperatures approach 90°F.
“The SBTU Mode resolves what many have considered a drawback in tankless water heater technology: how to handle minimal demands for heat in the warmer summer months,” said Noritz Executive VP-Sales and Marketing Jason Fleming. “The new and highly precise control of the combustion process should effectively eliminate this problem.”
Other key enhancements to the upgraded EZ Series include faster common venting, longer vent lengths and greater installation flexibility. As with their predecessor models, the new EZ98DV and the EZ111DV have three critical design features: top-mount, hot-water and cold-water connections,
maximum venting flexibility and the possible reuse the tank unit’s half-inch gas line.
Both models are available in their own “EZTR Bundle” packages (EZTR50 and EZTR75) that include materials and accessories for direct indoor replacement of 50- and 75-gallon, tank-type water heaters.
The EZ98DV has a maximum input of 180,000 BTU/h; a capacity range of 0.5 to 9.8 gallons per minute (GPM); and water temperatures from 100°F to 140°F (in 5°F intervals). The EZ111DV has a maximum input of 199,900 BTU/h, a capacity range of 0.5 – 11.1 GPM, and the same water temperatures.
Both units weigh 70 pounds and can be installed indoors or outdoors. (Accessories required for single-vent or outdoor installations). Additional accessories include a remote controller and cord, anchoring screws and wall-mounting brackets.