The model number RHHH1200NAIF2EXN corresponds to the Laars Rheos RHHH1200, a high-efficiency commercial condensing boiler designed for hydronic heating applications. This unit is part of the Rheos series, which includes models ranging from 1.2 to 2.4 million BTU/h input capacities.

Key Features
• High Efficiency: Boasts a combustion efficiency of 90.9% and a thermal efficiency of 92.1% at full fire, ensuring optimal energy utilization.
• Modulating Burner: Equipped with a fully modulating burner that adjusts firing rates from 25% to 100%, allowing precise temperature control and energy savings.
• Dual Heat Exchangers: Features a primary copper heat exchanger and a secondary stainless steel heat exchanger, enhancing durability and heat transfer efficiency.
• Integrated Pump: Comes with a factory-mounted and wired pump, simplifying installation and ensuring proper water circulation.
• Advanced Controls: Includes a microprocessor-based control system with diagnostic capabilities, facilitating easy monitoring and troubleshooting.
• Safety Mechanisms: Incorporates multiple safety features such as low water cutoff, manual reset high limit, and gas pressure switches to ensure safe operation.

Specifications
• Input Capacity: 1,200,000 BTU/h
• Output Capacity: 1,068,000 BTU/h
• Fuel Type: Natural Gas
• Vent Size: 6 inches
• Electrical Requirements: 120V, Single Phase, 20A circuit for the pump; 230V, Single Phase, 20A circuit for the blower
• Dimensions: Approximately 36” W x 36” D x 60” H
• Weight: Approximately 1,420 lbs
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