Rinnai Q85SN 85,000 BTU Natural Gas Condensing Boiler Fully modulating pump combines with stainless steel heat exchanger to make this one of the more efficient units available Qualifies for federal tax credit Minimum/Maximum Gas Rate Input (Heating): 17,000-85,000 BTU Compact wall-mounted design saves space over traditional boilers Optional 3-way valve available to eliminate the need for a pump for the indirect tank