BOSCH (BGH97 Series) 97% AFUE 100,000 BTU Two-Stage Up-flow/Horizontal Gas Furnace BGH97M100C5

The Bosch BGH97M100C5 is a high-efficiency, two-stage condensing gas furnace designed for residential heating. It delivers up to 97% AFUE, ENERGY STAR certification, quiet operation, and flexible multipoise installation. It is optimized for dual-fuel systems when paired with Bosch IDS heat pumps and is compatible with low-GWP refrigerants such as R-454B.

Key Features

• Up to 97% AFUE heating efficiency (ENERGY STAR rated)
• Two-stage gas valve for better comfort and efficiency
• Constant-airflow ECM (electronically commutated) multi-speed blower motor for quiet, efficient operation and consistent airflow
• Hot-surface ignition for reliable starting
• Durable aluminized-steel tubular primary heat exchanger + stainless-steel secondary heat exchanger
• 3-way multipoise design (upflow with side or bottom return; horizontal left or right)
• Field-convertible from natural gas to propane (LP conversion kit included)
• Low-profile 33-3/4″ cabinet that fits tight spaces
• Left- or right-hand gas and electrical connections
• Fully insulated cabinet (painted galvanized steel, anti-rust coating that passes 500-hour salt spray test)
• LED fault diagnostics for easier service
• Communication-ready when paired with compatible Bosch IDS systems and controls (e.g., Bosch Connected Control BCC thermostat)

Benefits

• Lower energy bills and reduced environmental impact thanks to high 97% AFUE
• Improved comfort from two-stage operation (runs mostly on lower stage, reducing temperature swings and noise)
• Quieter performance from the ECM blower and insulated cabinet
• Easier installation and replacement due to multipoise flexibility and compact size
• Future-ready for dual-fuel systems and newer low-GWP refrigerants
• Strong long-term reliability with robust heat exchangers and solid warranty coverage
• Potential for enhanced system efficiency (up to ~18.5 SEER2 / higher HSPF2) when matched with Bosch IDS heat pumps

Dimensions & Physical Specs (BGH97M100C5A / equivalent C-cabinet models)

• Cabinet width: 21 inches (C cabinet)
• Depth × Height: approximately 28-1/2″ to 28-3/4″ × 33-3/4″
• Supply-air opening width: ~19.5″
• Return-air opening width: ~19-7/16″
• Shipping/approx. weight: ~170–187 lbs (varies slightly by exact suffix and packaging)
• Gas connection: 1/2″ NPT
• Flue/vent: 2″ or 3″ (PVC/CPVC compatible for condensing operation)

Performance Specifications

• Input (high fire): 100,000 BTU/h (natural gas or propane)
• Input (low fire): approximately 65,000 BTU/h
• Output (high fire): ~97,000 BTU/h
• Output (low fire): ~63,000 BTU/h
• AFUE: 97%
• Air temperature rise: typically 35–65°F
• Max outlet air temperature: 170°F
• Cooling compatibility: 3.5 / 4 / 4.5 / 5 tons @ 0.5″ ESP
• Blower: 5-speed ECM; high airflow around 1,774 CFM @ 0.5″ ESP (model-dependent)
• Electrical: 115 V / 60 Hz / 1-phase; typical blower FLA ~11.5 A; max overcurrent protection usually 20 A
• Static pressure: Heating ~0.2″ WC certified; Cooling 0.5″ WC

Compatibility

• Natural gas or propane (conversion kit standard)
• Bosch IDS (Inverter Ducted Split) heat pumps for dual-fuel systems
• Bosch BMAC cased coils and compatible evaporator coils
• Standard thermostats; enhanced communication with Bosch Connected Control systems
• R-454B and other low-GWP refrigerants (meets related safety requirements)
• Suitable for upflow or horizontal installations in residential applications
• Note: Not approved for sale/install in certain California air-quality districts (South Coast AQMD / San Joaquin Valley)

Warranty (typical residential)

• 5-year limited parts (upgradable to 10 years with product registration)
• 20-year limited heat exchanger (upgradable to lifetime with registration)
• Shorter coverage may apply for non-residential or multi-family installations. Confirm current terms with Bosch or an authorized dealer.

This model is ideal for homeowners seeking efficient, quiet heating with strong dual-fuel and future-refrigerant compatibility. Always verify the exact suffix (A/C/etc.), local codes, and current manufacturer documentation for installation and performance details, as minor variations can exist between production runs.