Key Features: Columbia RV Hydronic Heating System - Mercedes Sprinter 170"WB. Heat Output: 17500-52500 BTU (17500 BTU furnace, 30000 BTU engine heat, 5000 BTU tank heat element) Power Consumption; W (A): 50W (4.1A@12VDC) with water pump running, 32W (3A@12VDC) when water pump not running, additional 1500W tank heat element can be used