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- The full line of A.O. Smith® Cyclone® MXI condensing water heaters has been designed to provide years of dependable service and feature industry leading technology. Models are available from 120000 to 500000 Btu/hr and all deliver thermal efficiencies of 95% and higher. The unique helical coil heat exchanger limits weld joints for optimal service life while maximizing heat transfer. Cyclone® is the industry leader in high efficiency commercial water heating. The current Mxi modulating models adjust firing rate to the specific demand further increasing efficiency and money savings.
Looking for model-specific repair or replacement parts? Enter the unit’s serial number into the A.O. Smith Parts Finder.
A.O. Smith® Cyclone® Mxi Gas Water Heater, Modulating, Series: BTH-400A, 399900 Btu/hr Heating, Natural Gas, 1-1/2 in NPT Gas Connection, 119 gal Tank, Direct Spark Ignition, Direct Vent, 4 in Vent, 1535 gph at 30 deg F Rise Recovery, 95% Energy Efficient, 1-1/2 in NPT Water Connection, 160 psi, 90 to 180 deg F, Tall, Ultra Low NOx: Yes, ASME(Yes/No): Yes, Glass Lined Steel, 33-1/8 in Dia x 75-3/4 in H
- Up to 98% thermal efficiency dramatically lowers operating costs
- Modulating models adjust firing rate to the specific demand further increasing efficiency and money savings
- Our exclusive advanced electronic control with built-in diagnostics, is network ready for remote monitoring
- Temperature and Pressure Relief Valve
- Fuel TypeNatural GasHeating Capacity399,900 BTU/hrIgnition TypeDirect SparkTall or ShortTallTank Capacity119 galUltra Low NOxYesVent TypeDirectASME(Yes / No)YesDimensions33-1/8 in Dia x 75-3/4 in HEnergy Efficiency95Gas Connection1-1/2 in NPTManufacturerA.O. SmithManufacturer #100120404MaterialGlass Lined SteelPressure Rating160 psiRecovery Rate1535 gph at 30 deg F RiseSeriesBTH-400ATemperature Rating90 to 180 degFVent Size4 inWater Connection1-1/2 in NPT