Philips OnSite vs ZOLL AED Plus: which one to buy in 2026
Buy the Philips HeartStart OnSite ($1,589) for an office, home or church where a first-time rescuer needs the simplest AED that weighs 3.3 lb. Buy the ZOLL AED Plus ($2,082) for a gym, warehouse, vehicle or outdoor site: it measures compression depth and rate in real time and carries an IP55 rating. Recertified, both cost $875 with a 3-year warranty.
01Which AED wins for which buyer?
The two models solve different problems. The OnSite removes steps for the rescuer: pull the green handle and it talks you through the rescue. The ZOLL AED Plus watches the rescuer: a sensor in its one-piece pad reports whether each push is deep enough and fast enough.
| Site | Pick | Why |
|---|---|---|
| Office, front desk, small business | Philips OnSite | Lowest new price of the two, 3.3 lb, pull-handle start. Recommended |
| Home | Philips OnSite | Lightest unit, voice coaching built for a first-time user. |
| Church, community hall | Philips OnSite | Volunteer responders, indoor cabinet, lower cost per unit. |
| Gym, fitness center | ZOLL AED Plus | Real-time depth and rate feedback, useful when CPR runs several cycles before EMS arrives. |
| Warehouse, plant, construction, vehicles | ZOLL AED Plus | IP55 dust and water rating versus IP21 on the OnSite. Recommended |
| Tight budget, either setting | Either, recertified | $875 with a 3-year warranty at AED Leader. |
| 5 or more units, several sites | Quote | Ask Response Ready for a fleet price and a compliance program. |
Still between the two after this table? The 60-second Find Your Perfect AED quiz weighs your site, budget and responders.
02How do the specs compare?
| Spec | Philips HeartStart OnSite (M5066A) | ZOLL AED Plus |
|---|---|---|
| New price (AED Leader, 9 Oct 2026) | $1,589 | $2,082 |
| FDA approval (PMA) | P160029 (6 Jun 2019) | P160015 (26 May 2017) |
| Weight | 3.3 lb (1.5 kg) | 6.7 lb (3.1 kg) |
| Dust and water rating | IP21 | IP55 |
| CPR help | Voice coaching and metronome | Real CPR Help: measures depth and rate |
| Shock after CPR pause | Quick Shock, 8 seconds typical | Charge in under 10 seconds (new batteries) |
| Adult energy | 150 J biphasic | 120, 150, 200 J biphasic, escalating |
| Self-test | Daily, weekly and monthly | Every 1 to 7 days (default 7) |
| Battery | M5070A, about 4 years in standby, $249 | 10 x CR123A lithium, 5 years, $100 a set |
| Adult pads | M5071A cartridge, about 2 years, $99 | CPR-D-padz one piece, 5 years, $230 |
| Child pads | M5072A, $139 (prescription use only) | Pedi-padz II, $155 |
| Versions | One (semi-automatic) | Semi or fully automatic, same price |
| Warranty, new | 8 years | 7 years |
Sources: Philips OnSite Owner's Manual M5066A, Ed. 15 [1]; ZOLL AED Plus spec sheet [2]; FDA PMA database [3][4]; AED Leader product pages for prices and warranties [5][6]. OnSite pad life follows Philips' 2-year expiry labeling as listed by sellers; check the date printed on the cartridge.
03Which one costs less over 5 and 10 years?
The OnSite wins the first five years by $46. Over ten years the ZOLL AED Plus pulls ahead, because its pads and batteries last 5 years instead of 2 and 4. The math below assumes no rescue (a used pad set is replaced at once) and AED Leader prices from 9 October 2026.
5 years: $1,589 device + 1 battery at year 4 ($249) + 2 pad sets at years 2 and 4 ($198) = $2,036
10 years: $1,589 + 2 batteries ($498) + 4 pad sets ($396) = $2,483
ZOLL AED Plus, new
5 years: $2,082 device, pads and batteries included and rated for 5 years = $2,082
10 years: $2,082 + 1 CPR-D-padz ($230) + 1 battery set ($100) at year 5 = $2,412
| Cost | Philips OnSite | ZOLL AED Plus | Gap |
|---|---|---|---|
| Day one | $1,589 | $2,082 | OnSite $493 cheaper |
| 5 years | $2,036 | $2,082 | OnSite $46 cheaper |
| 10 years | $2,483 | $2,412 | ZOLL $71 cheaper |
| Replacement visits in 10 years | 6 (pads x4, battery x2) | 1 (pads + battery together) | 5 fewer for ZOLL |
Cabinet, signage and training are the same for both and left out. Run your own numbers in the AED cost calculator. Pad and battery basics: AED pads explained and AED batteries explained.
The fewer visits matter more than the $71. Expired pads and flat batteries are the failure points an owner controls, so a site with no named AED owner is safer with one replacement date every five years than six dates spread across a decade.
Check today's price before you order
AED Leader, an authorized distributor, sells both models new or recertified. Prices below were checked on 9 October 2026; confirm current price and stock on the product page.
Philips OnSite at AED Leader, $1,589 ZOLL AED Plus at AED Leader, $2,08204Does real-time CPR feedback matter?
It is the one feature that separates these two AEDs in a rescue. The AHA asks for compressions at least 2 inches (5 cm) deep, no more than 2.4 inches, at 100 to 120 per minute [7]. A metronome can fix the rate; only a sensor can tell a rescuer the depth is falling short.
Philips OnSite
Gives voice instructions and a metronome beat for rate. It cannot tell whether the rescuer is pushing hard enough. After the CPR interval, Quick Shock delivers a shock in about 8 seconds, which keeps the hands-off pause short [1].
ZOLL AED Plus
Real CPR Help reads each compression through the CPR-D-padz sensor and responds with prompts such as "Push harder" or "Good compressions" [2]. The rescuer gets correction, not just a beat.
For a site where EMS may take longer to arrive, such as a large gym or a rural plant, the ZOLL's feedback is worth the $493 premium. For a small office with EMS minutes away, the OnSite's speed to first shock covers the risk at a lower price.
05Which one handles a rough site better?
The ZOLL AED Plus, clearly. IP55 means protected against dust and low-pressure water jets; IP21 means protected only against dripping water [1][2]. The OnSite belongs in a clean, indoor cabinet. Full scale: AED IP ratings explained.
| Factor | Philips OnSite | ZOLL AED Plus |
|---|---|---|
| Weight to carry up stairs | 3.3 lb | 6.7 lb |
| Dust (sawdust, warehouse) | Not rated Avoid | Protected |
| Rain, hose, pool deck | Drips only Avoid | Water jets |
| Operating temperature | 32 to 122°F | 32 to 122°F |
06What about children?
Both treat children under 8 years or 55 lb with dedicated pads that lower the energy. The OnSite uses the M5072A infant/child cartridge ($139), which Philips labels prescription use only [1]. The ZOLL uses Pedi-padz II ($155) [6]. Schools and daycares should budget the child pads on day one; neither unit includes them.
07New, value package or recertified: which price makes sense?
| Option (AED Leader, 9 Oct 2026) | Philips OnSite | ZOLL AED Plus |
|---|---|---|
| New device | $1,589 | $2,082 |
| Value package | $1,581.80 | $2,144.70 |
| Recertified, 3-year warranty | $875 | $875 |
| 5-year cost, recertified | $1,322 (pads x2 + battery) | $875 (sold with new pads and battery rated 5 years) |
Two findings stand out. First, the OnSite value package lists $7.20 below the bare OnSite device, so a business buyer should not buy the device alone. Second, the recertified ZOLL AED Plus is the cheapest five years of protection in this comparison, because AED Leader lists it with new pads and battery and both are rated for 5 years [6].
AED Leader lists the package contents as the AED with pads and battery, a wall cabinet, a carry case, signage, instruction booklets and a first responder kit. Package details: Philips OnSite value package and package vs single AED. Recertified details: recertified Philips OnSite, recertified ZOLL AED Plus and refurbished vs new.
Recertified OnSite, $875 Recertified ZOLL AED Plus, $875 OnSite value package, $1,581.80
08Philips OnSite vs ZOLL AED Plus: questions
Is the Philips OnSite or ZOLL AED Plus better?
Neither is better everywhere. The OnSite is better for indoor offices and homes on price ($1,589) and weight (3.3 lb). The ZOLL AED Plus is better for gyms and rough sites thanks to real-time CPR depth and rate feedback and an IP55 rating.
Which is cheaper to own?
Over 5 years the OnSite costs $2,036 and the ZOLL AED Plus $2,082. Over 10 years the ZOLL costs $2,412 and the OnSite $2,483, because ZOLL pads and batteries last 5 years.
How long do the pads and batteries last?
OnSite: M5070A battery about 4 years in standby, M5071A pads about 2 years. ZOLL AED Plus: 10 CR123A batteries and CPR-D-padz both rated for 5 years.
Does the ZOLL AED Plus come fully automatic?
Yes. AED Leader sells semi-automatic and fully automatic versions at the same $2,082. The OnSite comes in one semi-automatic version: the rescuer presses the shock button.
Is a recertified OnSite or ZOLL AED Plus safe to buy?
Buy from an authorized distributor that states the warranty in writing. AED Leader lists both at $875 with a 3-year warranty, and its ZOLL AED Plus listing states new pads and battery. Check the pad and battery expiry dates on arrival.
Which one is lighter?
The Philips OnSite at 3.3 lb (1.5 kg) weighs half as much as the ZOLL AED Plus at 6.7 lb (3.1 kg).
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Sources
- Philips, HeartStart OnSite Defibrillator Owner's Manual, M5066A, Edition 15 (June 2019): weight, IP21, 150 J, Quick Shock, battery life, M5072A labeling.
- ZOLL, ZOLL AED Plus specification sheet (Dec 2024): weight, IP55, energy, batteries, CPR-D-padz shelf life, Real CPR Help, self-test.
- FDA, PMA P160029, Philips HeartStart OnSite.
- FDA, PMA P160015, ZOLL AED Plus.
- AED Leader, Philips HeartStart OnSite AED (M5066A), prices and 8-year warranty checked 9 Oct 2026; M5070A battery $249, M5071A pads $99, M5072A pads $139.
- AED Leader, ZOLL AED Plus and ZOLL AED Plus (Recertified), prices and warranty checked 9 Oct 2026; CPR-D-padz $230, lithium battery set $100, Pedi-padz II $155.
- American Heart Association, Adult Basic and Advanced Life Support guidelines: compression depth and rate.
- CARES, 2025 Annual Report: survival when a bystander delivers the first AED shock.