The Lennox 90W84 Hydro-Air Hot Water Heat Kit (609346-01) is a genuine OEM accessory designed to integrate hydronic (hot water) heating into compatible Lennox air handler systems. This kit allows an air handler to utilize heat supplied from a boiler or hydronic loop, delivering efficient and consistent warm air distribution through the duct system.

Commonly used in residential and light commercial applications, this hydro-air heat kit is ideal for installations where a boiler is already present and electric heat is not desired as the primary heating source. When paired with air conditioning systems, the hot water coil typically functions as first-stage heat, while in heat pump applications it operates as second-stage or auxiliary heat.

The kit includes factory-engineered electrical and control components to ensure proper staging, safe operation, and seamless communication with Lennox-approved thermostats. As an OEM Lennox part, it is manufactured to precise specifications for long-term reliability and correct system performance.

 

Product overview:

OEM Lennox hydro-air hot water heat kit used to enable hot water heating in compatible Lennox air handlers. Designed for hydronic heating applications using boiler-supplied hot water, providing an efficient alternative or supplement to electric heat.

 

Specifications:

Manufacturer: Lennox
Part number: 90W84
Replaces / reference number: 609346-01
Application: Hydro-air hot water heating for Lennox air handlers
Heating source: Boiler / hydronic hot water
Function: First-stage heat with air conditioners; second-stage heat with heat pumps
Compatibility: Select Lennox air handler models (model verification required prior to installation)
Installation: Professional HVAC installation recommended