Halekulani needed the new system to serve not just one, but two hot water demands: a domestic system that supplies their guests’ hot water with redundancy and an in-house laundry system. The finished 6.4-million-BTU system features 20 Rinnai CU199IN commercial condensing tankless water heaters for domestic demand and 12 CU199IN units for the laundry system. The domestic system also uses a 1380-gallon storage tank, while the laundry system features an 800-gallon tank. Application engineers at Rinnai provided design guidance throughout, to ensure the plumbing system was in accordance with the drawing, and the storage tanks and recovery pumps operated optimally for maximized recovery and consistent temperature delivery.
All 32 Rinnai tankless units are tied into six UL-listed Rinnai BMS Gateways, each supporting up to six heaters. The gateways plug into the hotel’s BACnet system, which provides a common communication protocol allowing building equipment and devices to communicate across systems.
Now maintenance engineers and personnel at Halekulani can readily view and control virtually every aspect of system function – from turning tankless units on or off and adjusting water temperature to monitoring flow rates and operation hours – all from their computers, phones or the Rinnai handheld touchscreen located near the tankless units that interfaces with the building management system.
“It was fun to be on a team with so many brilliant people who put this system together,” said Zurier’s Vosika. “The management at Halekulani, along with Randy Hiraki, took the concept and created a real-world application that is literally a masterpiece, both mechanically and aesthetically. There’s no doubt Halekulani will reap the benefits in operational efficiency and guest satisfaction.”
For more information on commercial water heating solutions, maintenance services and a free sizing consultation by Rinnai Applications Engineers, call 866-383-0707 or visit rinnai.us/commercial.