Rinnai M-Series boilers offer faster, easier installation with the compact and lightweight design and convenient mounting brackets. These boilers offer efficient heating with a modulating pump for consistent temperature control of water used in the heating system, efficient gas and less electrical consumption. Multiple venting options allow for installation in a variety of locations. Rinnai M-Series boilers offer 3 distinct advantages above and beyond your average boiler: 1) Faster, Easier Installation • Compact and lightweight design • Convenient mounting bracket • NPT threads for connection points • More flexible venting options • Simplified parameters for commissioning and setup 2) Efficient Heating • More heating output • More heat transfer for domestic hot water • Consistently lower utility costs • Modulation pump optimizes heat transfer to the home while saving on electrical consumption • Integrated bypass to ensure proper flow to the heat exchanger • Quiet operation – comparable to the range of ambient noise in a library 3) Simplified Service • Simple control interface with large display • Simplified parameters and menu navigation • Easy to service Product Features: Venting • 2 in. and 3 in. PVC/ CPVC/PP venting • 2 in. / 4 in. and 3 in. / 5 in. concentric venting for single wall/roof penetration • 3 in. to 2 in. adapters included • Room air approved Turbo Fan • Automatically adjusts to venting installation to ensure clean efficient combustion Modulating Pump • Provides consistent temperature for water in the heating loop • Matches the gas load for higher gas and electrical efficiency Condensate Trap • Easy to remove and clean (no tools required) Zero Gas Governor Valve • Better performance at lower gas pressures and with 1/2 in. gas line High-Efficiency Stainless Steel Heat Exchanger • Designed for extended operation in Condensing Mode • Self-cleaning design • Minimal thermal expansion Silencer • Allows for ultra quiet operation Diverter Valve • Domestic Hot Water priority • Controls the flow between the heating system or DHW in combi units INCLUDED WITH ALL UNITS Each Rinnai Condensing Gas Boiler ships with: • LP Field Conversion Kit • Flue Adapters • Outdoor Reset Sensor • 1" NPT Adaptors (2) • Temperature Pressure Gauge • Pressure Relief Valve (PRV)