The Noritz NRCB residential combination boiler allows simultaneous hot water and space heating. Designed to ensure a consistent temperature for domestic hot water demand, the NRCB offers an impressive 95% AFUE, with flow rates ranging from 9.8 gpm to 11.1 gpm. The unit also features a flow control valve allowing increased hot water flow and temperature stability. Backed by a 10-year warranty, it features 316L corrosion-resistant, austenite stainless steel heat exchangers and adaptable PP or CPVC venting options.