June 11, 2015 Viessmann Vitocrossal 300, CU3A

Viessmann Vitocrossal 300, CU3A

Viessmann’s latest gas-fired condensing boiler is unlike any other condensing boiler system.   TJ’s has seen, first hand, just how this boiler operates, and what makes it so special.

With its combination of high temperature capability, high mass (water volume), floor standing design, condensing stainless steel construction and modulating gas burner, the Vitocrossal 300, CU3A is the ideal choice for boiler retrofits or new construction. From homes equipped with high mass cast iron radiators, to homes with multi-zone high temperature fin tube radiators, and new installations with high DHW requirements – the Vitocrossal 300, CU3A is the best choice on the market today.


Features and Benefits

  • Compact, floor-standing gas condensing boiler from 19-199 MBH.
  • Multi-boiler installation with 8 boilers up to 1592 MBH.
  • High efficiency of 95% AFUE on all models.
  • High temperature operation of up to 90°C (194°F).
  • Inox-Crossal heat transfer surface – 316Ti stainless steel heat exchanger for efficient utilization of condensing technology – self-cleaning effect via smooth stainless steel surfaces.
  • Vitocrossal Pocket Design with wide water passage ways allow for system/full flow applications. No dedicated boiler pump required and eliminates primary/secondary piping.
  • MatriX dome gas burner with 5:1 turndown ratio to ensure high efficiency and extremely clean combustion.
  • High water volume extends burner run time and reduces cycling.
  • A self-calibrating Lambda Pro combustion management system ensures optimal combustion efficiency at all times regardless of gas/air quality. Simple commissioning with no field adjustments and adjusts to all fuel types (NG and LPG).
  • Durable, reliable, and long service life with Inox-Crossal stainless steel heat exchanger and high mass design.
  • Multi-venting options and configurations with vent lengths up to 198 ft.
A Peek Inside the Viessmann Vitocrossal 300

A Peek Inside the Viessmann Vitocrossal 300

Vitocrossal Installation

Our first Vitocrossal installation was a huge success.  Upon firing, you could barely hear it run.  We have provided some pictures and a video for you to enjoy.

Vitcrossal 300



TJ’s is a Viessmann Partner


TJ’s is proud to be a Viessmann Partner.  The name Viessmann stands for products of top quality and the highest technological advancement in the heating and refrigeration industries. Viessmann manufactures a comprehensive range of heating products comprising all system components required by today’s progressive heating technology. The Viessmann concept of design-matched product components has, in fact, set the standard in the industry.   The newest condensing boiler – the Vitocrossal 300, CU3A, is no exception!