St John Ambulance is proud to launch two new automated external defibrillators (AEDs), the HEART One and HEART Two. These semi-automatic defibrillators combine St John Ambulance's lifesaving expertise with easy-to-use technology, making it the most reliable, affordable choice for workplaces, schools, and communities who want to protect the people that matter most.
About our HEARTs

Designed with a leading manufacturer
St John Ambulance is committed to saving lives. Our range has been designed based on immeasurable hours and experiences in first aid. We are confident that this is the very best AED for your workplace or community space in 2025.
Feature-rich and easy to use. No fuss, complete confidence
In those critical first few moments in a cardiac emergency, a first aider needs to act fast and with confidence. Clear voice prompts, visual prompts and on-screen text prompts guide you on every step; and the very latest clinical science means that the HEART measures the casualty and delivers the shocks that are needed.
Additionally, with 4G technology inbuilt, your HEART defibrillator will automatically self test and report its state and readiness, so you know it’s ready when you really need it.


Inclusive, accessible, and portable; all in one
Simple adult and child switching at the push of a button, a minimal interface, all without extra parts or added cost. At a light weight of 1.5kg and a slim profile, pack this in a bag and take it anywhere.
Low maintenance, no hidden costs and dedicated support
The HEART range of defibrillators self test daily, and no additional servicing is required, so first aiders can focus on what is in front of them.
You’ll get first rate after-sale support and service and a best-in-class 8-year warranty as standard; and we can also provide expert-led training in using your HEART defibrillator and delivering CPR, so both your HEART defibrillator and your first aiders are always rescue-ready.


A complete package for real emergencies
Not only are we introducing our own range of St John Ambulance defibrillators, we have also developed accessories to accompany them, so you can be fully equipped for emergencies in line with your own needs. Simplicity for first time users, yet robust enough for professional responders.
Frequently Asked Questions (FAQs)
What is the difference between the HEART One and HEART Two?
The HEART Two has all the capabilities of the HEART One, with the addition of a large colour display and multi-language support, offering an even richer guidance experience for the rescuer.
Do you provide training with the defibrillators?
Yes, we can provide training sessions for your staff or community. For example, you might opt for a 2-hour session where our trainers teach CPR and AED use, letting everyone get hands-on practice with a trainer unit. For others, we can provide demo sessions or instructional videos.
What is the warranty period?
Both models come with an 8-year warranty period, in line with the majority of brands on the market. Note that the service life of the devices themselves is 10 years when kept in the recommended conditions.
Are there a lot of maintenance or hidden costs?
Not at all. The HEART AEDs take care of themselves with daily self-tests. Maintenance mainly involves periodically replacing the pads and battery (every 5 years or after use). There is no calibration or servicing required and the devices will alert you audibly if something needs attention. St John Ambulance can also help remind you about expirations if you register the product.
Why is the St John Ambulance HEART worth the investment?
Our HEART AEDs are genuinely the best in class defibrillators for workplaces, schools, public and community spaces, based on the best and latest clinical expertise and incorporating the highest quality technology. Every aspect, feature and function is designed with the layperson first aider saving lives in mind. It’s also incredibly affordable for a defibrillator. And all this is backed by our 8-year warranty and minimal ongoing costs so you can buy with complete confidence.
Are the HEARTs semi-automatic or fully-automatic?
The HEART One and HEART Two are semi-automatic defibrillators.
Do you have a question? Call us for assistance.
☎ 0344 770 4800 (Mon-Fri, 8:30am-5:30pm)
The HEART defibrillator range was named by one of our St John Ambulance young volunteers. Robin, a St John Ambulance ‘Badger’, won our ‘Name the Defib’ competition with a name that encapsulates the product and our HEART values perfectly: Humanity, Excellence, Accountability, Responsiveness, Teamwork. Great job, Robin!