NVR vs DVR: which CCTV recorder is right for you?
NVR and DVR recorders do the same job in different ways. Here is how they differ and how to choose between them.
Every CCTV system needs a recorder to store the video. The two main types are the DVR and the NVR, and the NVR vs DVR choice affects your cameras, your cabling and what you can do with the system later. This guide explains the difference in plain language so you can decide with confidence.
What is a DVR?
A DVR (digital video recorder) works with analogue and HD-analogue cameras. Each camera is connected to the recorder with its own coaxial cable, and the recorder turns the video into digital files and stores them on its hard disk. DVR systems have been used for many years and are common in existing buildings.
What is an NVR?
An NVR (network video recorder) works with IP cameras. The cameras are connected to the recorder over a network, usually with ordinary network cable and a switch. The cameras do the video processing themselves and send the finished picture to the recorder. Many IP systems use PoE (power over Ethernet), which sends power and video through the same single cable.
The main differences
- Cameras: a DVR needs analogue or HD-analogue cameras. An NVR needs IP cameras.
- Cabling: a DVR uses coaxial cable plus a separate power cable for each camera. An NVR uses network cable, and with PoE one cable per camera is enough.
- Picture quality: IP cameras are available in higher resolutions and often give a sharper image, which helps when you need detail such as faces or number plates.
- Flexibility: IP cameras can be added anywhere on the network, including over long distances with the right equipment. Analogue cameras must be wired back to the recorder.
- Features: many IP cameras offer extras such as motion alerts, smart detection and easy viewing on a phone. Some modern DVRs offer these too, but IP systems usually go further.
- Cost: an analogue system is often cheaper to buy and can reuse existing coaxial cable. An IP system usually costs more at the start but is more flexible to grow.
Which one should you choose?
A DVR may suit you if:
- You already have coaxial cabling and good analogue cameras and want to upgrade the recorder
- You have a small shop or house and a tight budget
- The cameras are all close to the recorder
An NVR may suit you if:
- You are building or renovating and can install network cable from the start
- You need sharp detail, wide coverage or cameras in several buildings
- You want to add cameras over time and manage them from one place
Some recorders are hybrid and accept both types of camera, which can be a good middle step when you upgrade an old system a little at a time.
Do not forget storage and power
Whichever recorder you choose, the hard disk decides how many days of video you keep. More cameras, higher resolution and continuous recording all need more storage. Plan for a UPS as well, so that a power cut does not stop the recording. Our guide on how many CCTV cameras you need explains how to size the whole system.
Our advice
For a new installation we usually recommend IP cameras with an NVR because they are easier to expand and give a clearer picture. For an existing building with good coaxial cabling, upgrading to HD-analogue cameras and a DVR can save time and money. The right answer depends on your site, which is why we start with a survey.
Read more about our IP camera installation and CCTV camera installation services, see turret and bullet cameras and network cables and connectors, or contact us for a free site survey in Rawalpindi or Islamabad.
