The AMP-L Condensing Water Heater Series (AMPW) from Thermal Solutions delivers efficiency and powerful output with unprecedented space-saving innovation in a service-friendly design. Available in 399, 500, 650, 800, and 1000 MBH input levels, all models are 97% Thermal Efficient and modulate at 10:1 firing rate. The 316L stainless steel heat exchanger features cavernous internal circuits with commercially sized tubes that promote self-cleaning and flushing of waterside particulates.