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Don't know your exact needs but maybe one of these fit the bill . Watch the videos , read the I & O manual , specs . I can tell you they are both real powerhouses and a service dream , IF you ever need to do it . PLUS has redundancy with the 2 combustion assemblies and everything is right out in the open . If you must have ASME models check these out that John Langan sent me tonight ( http://www.pvi.com/products/gas/commercial-condensing-gas-water-heaters.htm ) . Honestly though I have not seen an AO Smith Cyclone yet that worked as advertised or without power / circuit board issues . Stopped using AOS about 6 years ago because of service related issues and product quality .