Lennox 12S59 Heater

The Lennox 12S59 (Model ECB25-10-P) is a high-performance 10kW electric heat kit engineered for seamless integration with CBX25UH and CBX25UHV series air handlers. This OEM Lennox heater operates on a 208/240V single-phase power supply, providing critical supplemental or primary heating in residential and light commercial forced-air systems. As a terminal block style heat section, it is designed for simplified field installation, sliding directly into the blower compartment to ensure optimal factory-spec airflow across the heating elements. The 10.0 kW output translates to approximately 34,120 BTU/hr, making it a reliable solution for maintaining setpoint temperatures during extreme cold or as an auxiliary heat source for heat pump applications. For contractors, the Lennox ECB25-10-P offers the exact fitment and electrical compatibility required to maintain system efficiency without the need for extensive field modifications or internal rewiring.

• Precise Compatibility: Specifically designed for CBX25UH air handler and CBX25UHV models to ensure airflow safety and proper heat dissipation.
• Efficient Power Output: Delivers a consistent 10 kW heating capacity (208/230V, 60Hz) for reliable supplemental heat.
• Terminal Block Configuration: Features a rugged terminal block for secure electrical termination and simplified high-voltage line connections.
• Durable Heating Elements: Constructed with heavy-duty nickel-chromium coils for rapid response and long-term thermal stability.

Common Questions

Which air handler models are compatible with the Lennox 12S59?
This HVAC electric heater is verified for use with the Lennox CBX25UH and CBX25UHV series uncased and cased air handlers. Always verify the unit’s nameplate for maximum overcurrent protection and minimum circuit ampacity before installation.

Does this unit include a circuit breaker or a terminal block?
The ECB25-10-P model is the terminal block version. If your application specifically requires an integrated circuit breaker for local disconnect, refer to the ECB25-10CB-P variant.

Can I use this 10kW kit to replace a smaller 5kW heater?
Yes, provided the existing electrical service, including wire gauge and breaker size, is rated to handle the increased ampacity required for a 10kW load. Consult the manufacturer's wiring diagram for specific circuit requirements.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.