Vaillant System Boilers
Although similar in many ways, the difference between a Sealed System Boiler and a Conventional Boiler (Regular Boiler) is that the System Boiler incorporates all the of the major components built-in, including an expansion vessel and modulating pump. Generally all components are pre-wired, pre-plumbed and pre-tested for greater reliability, as well as a quicker and neater installation.
