Pool Pump IE3 and IE4 Efficiency Classes Explained

What IE3 and IE4 mean

IE3 and IE4 are efficiency classes for electric motors, set by the International Electrotechnical Commission (IEC) standard IEC 60034-30-1. The letters stand for International Efficiency. IE3 is named the Premium Efficiency class and IE4 is named the Super Premium Efficiency class, one step higher.

In a pool pump listing, IE3 or IE4 is a statement about the motor, not about flow rate, pressure, horsepower or pool size. A pump with an IE4 motor still needs a horsepower and speed type that fit the pool; the efficiency class is one detail among several.

The standard behind the classes, IEC 60034-30-1, covers efficiency classes for low-voltage electric motors. Pool pump motors are part of that motor family, and a listing that carries the code is stating where the motor sits in those classes.

Where the classes come from

The motor efficiency classes run from IE1 to IE4, with higher numbers naming higher classes. Makers publish the class in motor documentation, and pump listings sometimes carry it as a feature word.

The Pool & Hot Tub Alliance (PHTA) is an ANSI-accredited standards developer for pools and spas. Its standards page states that codes, regulations and standards vary between jurisdictions and that compliance is important; PHTA publishes standards including an American National Standard for residential swimming pool and spa energy efficiency.

For a buyer, the practical part of a standard is that it gives the industry one naming system. When a listing states IE4, the code means the same thing on any maker's pump, which is what makes the class comparable across listings.

Reading a listing that states IE3 or IE4

The efficiency class appears as a short code such as IE3 or IE4, usually near the motor specification in the listing. It may sit beside motor words such as permanent magnet, EC or inverter, which name motor technologies.

If the listing does not state a class, the seller may simply not state it. Ask the maker whether the motor carries an IEC class and where the manual documents it.

The efficiency class is a feature word, not a model name. Model names on pool pumps usually carry a maker's own code, such as a series number; IE3 and IE4 are the efficiency class and mean the same across makers. See the horsepower explained article for how model codes and feature words sit in a title.

• What IE3 and IE4 do not state: flow rate in GPM, head in feet, horsepower, speed type, voltage, pool type.

IE3 versus IE4

IE4 names a higher efficiency class than IE3. In motor terminology, a higher class means the motor converts a higher share of electrical input into mechanical output.

This article cannot say how much electricity a specific IE3 or IE4 pump uses in a particular pool. Energy use depends on the whole pump design, the speed program and the pool's plumbing, and the source pages make no statement about IE3 or IE4 pumps specifically. The U.S. Energy Information Administration notes that electricity use in homes varies widely across regions and types of home. Compare listings on stated horsepower, speed type and the class the maker's manual confirms.

What a buyer can do is compare the stated figures. Two listings that state the same horsepower and speed type may state different classes; the maker's manual is the place to confirm the motor class and the motor technology. The permanent magnet motor article explains the motor type most often named alongside higher classes.

Related efficiency words in listings

ENERGY STAR is a program of the U.S. Environmental Protection Agency. Its pool pump page states that certified pool pumps can run at different speeds and can use more efficient motors and advanced hydraulic designs. The program's key product criteria page states a wire-to-water efficiency factor (WEF) requirement for certified pumps.

WEF is a measure that connects the pump's electrical input to the water it moves. The criteria page states different WEF requirements for self-priming inground pumps, non-self-priming above ground pumps and pressure cleaner booster pumps. See the energy efficiency article and the EC motor article for related terms.

The ENERGY STAR criteria do not name IE3 or IE4. They state a WEF requirement, which is a different way of expressing efficiency. A pump can state a motor class, carry ENERGY STAR certification, or both; each is a separate stated detail.

Shopping questions

Shopping for a pump that states IE3 or IE4 starts with the same questions as any pump purchase: what speed type the pump offers, what horsepower is stated, and which pool type the listing names. The class is a motor detail that answers none of those questions by itself.

For a pump with a stated class, compare the guide pages on this site: variable speed pumps and dual speed pumps each compare models on stated horsepower and speed type.

• Does the listing or the maker's manual state IEC class IE3 or IE4?
• What motor technology does the maker's documentation describe?
• What speed types does the pump offer, and what horsepower is stated?
• Does the pump fit an inground or an above ground pool?

Efficiency class versus speed type

The efficiency class and the speed type are separate details. A single speed pump can carry an IE3 motor, and a variable speed pump can carry one too; the listing states both or neither. See the 2-speed vs variable speed article for the speed type comparison.

When a listing states IE4 and variable speed together, it is stating two things: the motor's efficiency class and the pump's speed program. The buyer still needs the horsepower figure and the pool type, inground or above ground, to choose a pump.

What to pick for your situation

Questions

What does IE3 mean on a pool pump?

IE3 names the Premium Efficiency class for electric motors, defined by IEC standard 60034-30-1. In a listing, it is a statement about the motor's efficiency class, not about flow or horsepower.

What does IE4 mean on a pool pump?

IE4 names the Super Premium Efficiency class, one class above IE3. A listing that states IE4 describes the motor, and the maker's manual is where the class is documented.

Is an IE4 pump better than an IE3 pump?

IE4 names a higher efficiency class than IE3. Whether a specific pump suits a pool depends on stated horsepower, speed type and pool type; compare those stated details and ask the maker.

Where do IE3 and IE4 come from?

They are efficiency classes from the International Electrotechnical Commission's standard IEC 60034-30-1, which classifies electric motors by efficiency. Pool pump listings sometimes carry the class as a feature word.

Do all pool pumps state an efficiency class?

No. Many listings state horsepower, speed type and voltage but not an IEC class. When the class is not stated, ask the maker whether the motor carries one and where the manual states it.

How do you compare pumps that state different classes?

Compare the pumps on stated horsepower, speed type and pool type, and treat the class as one detail. The dual speed guide and variable speed guide compare pumps on stated details.