ECB45-20CB-P – HEAT KIT (20 KW, 81-22773-00)

Lennox / Allied Air ECB45-series electric heat section, 20 kW at 208/240V single phase, 60 Hz, with factory-installed circuit breaker protection (one 60 A and one 50 A breaker). Lennox lists it for CBK45 and CBA25 series air handlers. Manual-reset current- and temperature-actuated limit protection.

Specifications published by the manufacturer. Source: manufacturer documentation.

Specs

• Heating Capacity20 kW
• Voltage / Phase / Hz208/240 V / 1 Ph / 60 Hz
• Internal ProtectionOne 60 A and one 50 A circuit breaker
• Breaker IncludedYes
• FitsLennox CBK45 and CBA25 series air handlers
• Catalog No.27A18
• Weight6 lb
• Dimensions (W x H x D)11.38 x 7.0 x 21.18 in.

Cross-reference numbers

This part replaces the following OEM and aftermarket numbers:

• 27A18
• 81-22773-00
• ECBA25-20CB

Not sure if your number matches? Call (214) 340-9421 or bring the old part in — bench-testing is free.

How do I size a heat kit for my air handler?

Match the kW rating to your air handler's tonnage: - 10 kW -- fits 1.5, 2, or 2.5 ton air handlers - 15 kW -- fits 3, 3.5, or 4 ton air handlers - 20 kW -- fits 5 ton air handlers

Can I add electric heat to my heat pump system?

Yes -- heat pumps almost always use electric strips as backup ("auxiliary heat" or "emergency heat"). The thermostat energizes the strips when outdoor temps drop below balance point (typically 35-40 degrees F in DFW). Match the heat kit to your air handler model.

What does the suffix on the part number mean?

The suffix typically indicates breaker configuration: - BRK = factory breaker included - BR = breakerless (you provide the disconnect) - Other suffixes = circuit count, voltage taps, or thermostat compatibility

How long does an electric heat kit last?

20+ years typical for the kit itself; individual heating elements (sheath heaters) may fail in 8-15 years from cycling. Most kits have replaceable elements -- you don't have to replace the whole kit for one bad strip.

Why is my heat kit tripping the high-limit?

Restricted airflow is the #1 cause: clogged filter, dirty blower wheel, undersized return, closed-off supplies. The strips overheat when air doesn't move across them fast enough. Diagnose airflow before condemning the heat kit or limit switch.