TEFC vs ODP Pool Pump Motors: Which Enclosure?

Two motor enclosure abbreviations

TEFC stands for totally enclosed fan cooled, and ODP stands for open drip proof. Both are motor enclosure words that describe the motor's housing and the way the motor lets heat leave it. The terms come from the naming used in electric motor catalogs, and a pool pump listing may repeat them to describe the motor body.

Neither word is a performance figure. A title that reads "TEFC motor" tells you about the housing, not the pump's horsepower, speed type or voltage. Those figures appear as separate words in the same listing; read the enclosure as one detail among several.

The pool equipment industry has national consensus standards developed by the Pool & Hot Tub Alliance (PHTA), an ANSI-accredited standards developer, so motor enclosure words appear across pump catalogs from makers such as Hayward and Pentair.

How a TEFC motor is cooled

In a totally enclosed fan cooled motor, the housing is fully closed. A fan mounted on the motor shaft turns with the motor and blows air across the outside of the housing. Heat from inside the motor passes through the housing metal, and that fan-driven air carries it away.

Because the housing is closed, the air moved by the fan does not flow through the interior. On an outdoor pool pad, the air around the pump is the same air used by the fan; the interior of the motor is not exposed to that air. See motor cooling for how the airflow relates to the rest of the pump.

The enclosure is one reason outdoor pumps are listed with a TEFC motor; the design suits a motor body that sits in the weather. Read the maker's manual for the pump's stated placement guidance.

How an ODP motor is cooled

An open drip proof motor has openings in the housing that allow outside air to move through the motor, directly over the windings. That direct airflow is the cooling method: the motor pulls surrounding air through its interior and pushes heat out with it.

The drip-proof part of the name refers to the shape of those openings. They are placed and angled so that water dripping from above does not enter the motor under normal conditions. An ODP motor is a common motor type in indoor and protected settings; for a pool pump, the listing may state the type without spelling out the location.

For a pump with an ODP motor, the surrounding air is part of the cooling path. Compare what the listing states and read the maker's manual for the intended placement; the weatherproofing guide explains how outdoor exposure is described in listing terms.

Reading the enclosure in a pump listing

Some listings state TEFC or ODP in the title or in the bullet list; many do not. When the seller does not state the enclosure type, treat that detail as not stated by the seller. You can still compare the listing on its stated horsepower, voltage, speed type, connection size and pool type.

A pump listing combines several word types: feature words for the motor body, such as TEFC or ODP; speed words such as single speed, dual speed or variable speed; and figure words for horsepower and voltage. Reading them as separate categories helps you compare 2 listings side by side. Start with the variable speed pool pump guide or the dual speed pool pump guide for the speed words.

What to look for in a pump listing:

• Horsepower and total horsepower figures as stated
• Speed type: single, dual or variable speed
• Voltage, such as 115V or 230V, as stated
• Motor enclosure, if the seller states TEFC or ODP
• Pool type: above ground or inground

Comparing enclosures on stated details

To compare an ODP pump with a TEFC pump, read each listing's stated details: the enclosure, the horsepower, the speed type and the connections. The enclosure is one difference among several, and it does not change the pump's output. See horsepower explained for the output figure.

Codes and regulations vary between jurisdictions, as the Pool & Hot Tub Alliance notes; for a specific pump project, the maker's manual and the local building office are the places to check questions that apply to your location.

Use the stated enclosure as a design description, not as a performance promise. The buyer can compare the stated details of any 2 pumps and check the manual for placement; the maximum ambient temperature guide covers one stated condition to look for.

What to pick for your situation

Questions

Is a TEFC motor the right choice for an outdoor pool pump?

For a pump that sits outdoors on a pad, the totally enclosed TEFC design is the one most pool pump listings state, because the enclosed housing keeps the interior out of the surrounding air. An ODP motor is more common in indoor or protected settings. Read each listing and the maker's manual for the stated placement.

Why do many pump listings not say TEFC or ODP?

Sellers commonly state the horsepower, speed type and voltage and omit the enclosure type. When the enclosure is missing, the listing is simply not stated by the seller for that detail; compare the figures the listing does state.

Does the motor enclosure change the pump's horsepower?

No. TEFC and ODP describe the motor housing and its cooling path, not the output. Horsepower is a separate stated figure in the listing.

Can you compare a pump with an ODP motor and a pump with a TEFC motor?

Yes, on the stated details of each listing. The enclosure is one difference; the speed type, voltage, connections and pool type are others.