Viessmann Vitocrossal 300 CU3A-94 Floor-Standing Condensing Boiler, 94,000 BTU

The Viessmann Vitocrossal 300 CU3A-94 is a floor-standing gas condensing boiler with a 94,000 BTU maximum input. It suits residential and light commercial hydronic systems, including cast-iron radiators, baseboard loops and multi-zone layouts.

A MatriX dome modulating burner firing into an Inox-Crossal stainless heat exchanger gives up to 95% AFUE, and a 5:1 turndown keeps part-load operation efficient with less cycling. The boiler runs on natural gas or propane and is designed for retrofits, including older high-temperature radiator systems.

Thanks to its large water volume, many installations can skip complex primary/secondary piping. The compact footprint fits retrofit mechanical rooms, and the unit can operate at altitudes up to about 10,000 ft.

Highlights

• 94,000 BTU maximum input on natural gas or propane

• Up to 95% AFUE with a 5:1 turndown ratio

• MatriX dome burner with Inox-Crossal stainless heat exchanger

• High water content can simplify or remove primary/secondary piping

• Suits cast-iron radiator, baseboard and multi-zone systems

Specifications

Good to know

• Gas-fired appliance: it must be installed, vented and commissioned by a qualified installer in line with local codes and the manufacturer's installation manual.