Most imaging systems connect directly to a conventional portable video recorder, either VHS or 8 mm format. Some systems are elegantly simple, while others are a jumble of cables and buttons. This is great for permanent documentation. Some more expensive imaging systems are capable of storing the image on an on-board computer disc. This is a nice feature, but most of us will never need it.
Several companies make such systems.
They are definitely worth looking at, particularly if they will primary be used for auditor or crew training. Those who aren't familiar with interpreting a thermal image find the visual correlation helpful. However, not all systems offer the same features. Some simply alternate between visual and thermal, while others have a picture within a picture. Like most electronic equipment, imagers are generally reliable.