Viessmann Vitocrossal 300 Model Review

Viessmann boilers systems are known for being highly efficient, durable and noise free.

Over the years, Viessmann boilers have grown in popularity, and for a good reason. The boiler manufacturer has now introduced its newest instalment of domestic boiler systems called the Viessmann Vitocrossal 300 cu3 boiler system. Let’s find out more about this boiler system.

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Features and Benefits

  • Floor standing gas condensing boilers (19-199 MBH)
  • Multi-boiler installation with 8 boilers (up to 1592 MBH)
  • Matrix dome gas-burner with 5:1 turndown ratio
  • High temperature operation (up to 190 degrees F)
  • High efficiency of 95% AFUE
  • Easy conversion from natural gas to liquid propane

Vitocrossal 300 Overview

The Viessmann Vitocrossal 300 cu3 boiler system is a gas condensing boiler system that is floor mounted and boasts of an efficiency of up to 95% AFUE. The Viessmann Vitocrossal 300 cu3 boiler system was also named an Energy Star’s Most Efficient boiler of 2016. The Vitocrossal is the replacement of the older cast iron sectional boilers, and features simple connections that allow for the remaining piping to remain intact. The intake air flue and exhaust connections are also located about 11 inches off the ground for better connection to chimneys. The Viessmann Vitocrossal 300 cu3 boiler system also features an Inox-Crossal stainless steel heat exchanger which has the ability to self-clean, reducing the amount of maintenance the boiler system needs during its lifetime. There are also multiple configuration and venting options, ensuring optimum performance all year through.


One of the main features of the Viessmann Vitocrossal 300 cu3 boiler system is that it has a high mass design, which means it provides a large volume of water for the BTU/H input. It’s also simple to use since there is no primary or secondary piping needed, and no need for a low loss header to build into the system. Being a floor-standing unit, the Viessmann Vitocrossal 300 cu3 boiler system can easily fit in any small space. All of the pipe connections are at the back of the boiler system, giving it a neat design. The vent can also be side-walled up to 190 feet.


The combustion management system in the Viessmann Vitocrossal 300 cu3 boiler is self-commissioning, which means the burner will fire up automatically. The boiler system also features a menu driven control system and quick start-up guide that simplifies the system commissioning. The boiler has 0-10 volt output to control a system variable speed pump. The boiler also features three boiler temperatures; high temperature, direct from the boiler, and two low temperatures via the mixing valves, apart from the DHW production. The boiler uses all the latest technology Viessmann has to offer, making it super-efficient and very quiet, which is a bonus.