Kill A Watt P4400 vs P4460 EZ

Choose the P4460 Kill A Watt EZ for most appliance records: it retains accumulated energy, elapsed time and total cost through power loss, and calculates costs from a rate you enter. Choose the P4400 Kill A Watt if you prefer dedicated reading buttons and will copy totals before disconnecting; its manual lists the same typical and maximum accuracy values for the principal measurements.

Quick picks: original or EZ?

Compare specifications and all conditions

Our pick for

P4400 Kill A Watt

Simple readings, with a notebook

P4460 Kill A Watt EZ

Saving totals and seeing estimated costs

Controls

P4400 Kill A Watt

Dedicated Volt, Amp and paired-function keys

P4460 Kill A Watt EZ

MENU, UP, DOWN, RESET and SET

Electrical measurements

P4400 Kill A Watt

Volts, amps, watts, VA, Hz, power factor

P4460 Kill A Watt EZ

Volts, amps, watts, VA, Hz, power factor

Cumulative readings

P4400 Kill A Watt

kWh and powered time

P4460 Kill A Watt EZ

kWh, powered time and total cost

Cost calculation

P4400 Kill A Watt

Calculate from kWh yourself

P4460 Kill A Watt EZ

Total cost plus hour/day/week/month/year projections

Power interruption

P4400 Kill A Watt

Counters reset

P4460 Kill A Watt EZ

Totals retained; screen goes blank

Published maximums

P4400 Kill A Watt

125 VAC, 15 A, 1875 VA

P4460 Kill A Watt EZ

125 VAC, 15 A, 1875 VA

Full comparison table ↔

Swipe to compare. Row labels stay visible.

Decision	P4400 Kill A Watt	P4460 Kill A Watt EZ
Our pick for	Simple readings, with a notebook	Saving totals and seeing estimated costs
Controls	Dedicated Volt, Amp and paired-function keys	MENU, UP, DOWN, RESET and SET
Electrical measurements	Volts, amps, watts, VA, Hz, power factor	Volts, amps, watts, VA, Hz, power factor
Cumulative readings	kWh and powered time	kWh, powered time and total cost
Cost calculation	Calculate from kWh yourself	Total cost plus hour/day/week/month/year projections
Power interruption	Counters reset	Totals retained; screen goes blank
Published maximums	125 VAC, 15 A, 1875 VA	125 VAC, 15 A, 1875 VA

Decision	P4400 Kill A Watt	P4460 Kill A Watt EZ
Our pick for	Simple readings, with a notebook	Saving totals and seeing estimated costs
Controls	Dedicated Volt, Amp and paired-function keys	MENU, UP, DOWN, RESET and SET
Electrical measurements	Volts, amps, watts, VA, Hz, power factor	Volts, amps, watts, VA, Hz, power factor
Cumulative readings	kWh and powered time	kWh, powered time and total cost
Cost calculation	Calculate from kWh yourself	Total cost plus hour/day/week/month/year projections
Power interruption	Counters reset	Totals retained; screen goes blank
Published maximums	125 VAC, 15 A, 1875 VA	125 VAC, 15 A, 1875 VA

Sources: P3's P4400 page, P4460 page, original manual and EZ manual.

The model number matters more than similar packaging: P4400 is the original; P4460 is EZ. Both product pages specify 115 VAC operating voltage. Their 1875 VA maximum is an apparent-power rating; it should not be presented as a continuous-watts allowance. Both manuals distinguish active watts from apparent VA.

Best for saving appliance records: P4460 Kill A Watt EZ

The reason to buy EZ is the ability to move a completed record away from an inconvenient outlet. Its manual explicitly permits relocating the unit to read accumulated data after reconnecting it. The backup preserves the record; it does not keep the disconnected display working.

EZ also calculates actual total energy cost and forecasts for Hour, Day, Week, Month and Year. Set the utility rate before relying on those amounts. P3 advises choosing a representative rate or averaging rates when the utility uses tiers or different times of day. Treat the result as an estimate based on that programmed rate, not a complete reproduction of a changing tariff.

The trade-off is navigation: MENU selects a display group, and UP/DOWN select readings or projection periods within it. The button worksheet below makes that manageable.

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Best for simple readings: P4400 Kill A Watt

The original gives you direct Volt and Amp keys, plus Watt/VA, Hz/PF and KWH/Hour toggles. It starts accumulating energy and powered time when power is applied. If you only need electrical readings and can copy the record at the outlet, that is a straightforward workflow.

Its main limitation is disconnection: the manual tells you to remove power momentarily to reset it. It also says counters recycle to zero at their maximum. Save the record before removing the meter.

A wording conflict to know: P3's P4400 page says “Forecast Your Costs,” but its manual documents kWh and hours, with no cost or rate-setting controls. Our recommendation follows the documented controls: calculate costs yourself, or buy EZ for on-screen amounts.

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How to use a Kill A Watt meter: the button worksheet

Both manuals describe true RMS voltage and current, active power in watts and apparent power in VA. For an energy record, save kWh together with powered time. The clock tracks how long the meter has power, including time when the attached appliance is off; it is not a compressor-runtime counter.

On EZ, MENU → Volt enters the measurement group; use UP/DOWN to select the electrical quantity. The other MENU displays include Cost, Rate, KWH and Elapsed Time. On either model, read the unit symbol alongside the number.

Copy this record: Appliance/state: ___; start/stop: ___; kWh: ___; powered time and displayed format: ___; watts/VA/PF: ___; rate per kWh: ___; cost and selected period: ___.

Both manuals describe time initially in Hours:Minutes, changing to whole hours as the total grows. Preserve the displayed format, not just the digits. Capture live watts and power factor while the appliance remains attached; EZ's retention instructions promise accumulated energy, time and total cost, not a saved snapshot of every live reading.

For P4400, energy cost = recorded kWh × your rate per kWh. On EZ, distinguish Cost + Total, the accumulated amount since reset, from Cost + Month, a forecast. When entering the rate, the manual's examples use dollars per kWh: convert a cents-per-kWh figure accordingly, then press SET and check for “SAVE.”

What survives unplugging—and what changes on reconnection

P4400's energy and time start again after power is removed. On P4460, interruption blanks the display and stops energy measurement and elapsed time, while retaining kWh, elapsed time and actual total cost. These are different behaviors even if both meters were showing the same energy total beforehand.

The easily missed EZ detail is what happens next: reconnecting restarts elapsed time, even if the appliance is elsewhere. P3 says to retrieve the data immediately because time with no load can skew the record. Write down final elapsed time at the appliance when possible; otherwise make it the first reading after reconnection.

1. 1

   Capture live readings

   Record watts, VA or power factor before disconnecting the appliance.

2. 2

   Preserve totals by model

   On P4400, copy kWh and powered time before removing power. EZ retains accumulated energy, time and total cost.

3. 3

   Read EZ promptly after reconnecting

   Retrieve Elapsed Time first, then KWH and Cost Total; the powered-time counter has restarted.

4. 4

   Start the next record deliberately

   Save the old record before resetting. On EZ, hold RESET until rESt to clear energy, time and cost.

If EZ's screen is inaccessible in the original location, its manual allows a quality extension cord rated for the application during installation. Follow its installation instructions, including turning the appliance off before connecting it. An accessible screen avoids the need to move the completed record at all.

Accuracy: compare the manuals, not the headline

Both product pages promote 0.2% accuracy. Both manuals give the following more specific values; EZ has no documented improvement in these rows. These are manufacturer specifications, not independently verified results.

Sources: the specifications table in each model's manual, linked above. The P4400 table is embedded as an image.

Conditions differ in what is documented. EZ's table adds “Typical: V=90V125V, A=0.2A15A.” The P4400 table does not print that footnote. Both list an 85–125 Vrms measurement range; that range should not replace the product's operating specification or label ratings.

The EZ footnote's 0.2 A is a typical-accuracy condition, not its minimum current range: the table lists 0.00–15.00 Arms. It does not establish the same typical accuracy for tiny standby loads. Nor does either manual support applying the sales page's voltage-sized percentage to all watt or energy readings.

Buying advice: match the load to the documented limits

Both manuals specify a 1-second display update. That specification alone does not establish an inrush-capture function. P3 also warns that cost projections for cycling appliances require full on and off cycles; a running-only observation can initially exaggerate projected cost.

• Yes: Confirm the appliance fits the meter's marked voltage and current limits.
• Yes: Keep the meter dry and follow its model-specific manual.
• Partly: Treat forecasts as estimates tied to the selected rate and observed usage.
• No: Do not open the case or exceed the ratings to accommodate a different load.

For broader product selection, see our Kill A Watt and plug-in watt meter guide. For circuit and whole-home options, see our home energy monitor guide.

How we choose

We compared P3's model-specific product pages and operation manuals. We have not physically tested either meter. Picks reflect the documented controls, retention behavior, per-quantity accuracy and electrical limits. Where a sales-page headline is broader than the manual, we explain the difference. Our measurement policy distinguishes manufacturer specifications from any future site measurements.

Verdict

Buy P4460 EZ for retained appliance records and visible cost estimates, especially when the outlet is awkward to read. Buy P4400 for direct electrical readings when you can record totals before disconnecting. The manuals give no reason to pay for EZ expecting a better watt-accuracy specification; its useful advantages are memory and cost functions.