The AM Series high efficiency water heaters provide you with a powerful hot water system with a compact footprint and built-in redundancy. The AM Variable Radial Circulation heat exchanger is highly resistant to scale build-up which increases your ROI, expands the lifetime expectancy of your system and promotes uptime reliability. Multiple units can be located with near-zero side clearance for even larger installations. Internal valves are included affording you additional savings on installation costs. AM water heaters are available in six sizes from 199,000 to 1 million BTU/hr (199 and 250 available in AM Rapid Recovery Integrated only).