Vitocrossal 300 CT3

Proven condensing technology

Vitocrossal 300 CT3 is a commercial gas-fired condensing boiler with Inox-Crossal heat exchanger made of corrosion-resistant stainless steel. Rated input: 638 to 3361 MBH

High operational reliability and long service life
Highly efficient heat transfer

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High performance

Efficiency up to 98.3% through intensive flue gas condensation.

Easy handling in boiler rooms

Through particularly low build height and weight.

Economical and reliable heating

Through Vitotronic digital control system with communication capability.

Clean combustion

Through perfect match of burner and boiler and low combustion chamber thermal loading.

Two return connections

Providing separate connection for heating circuits with lower return temperature, allowing for increased condensation.

Standard LON BUS

For complete integration into building management systems.


Discontinuation notice

The  Vitocrossal 300 CT3 boiler series has been discontinued. If you are looking to purchase a new commercial gas-fired boiler, please consider the  Vitocrossal 200  or  Vitocrossal 300 CA3B  series.

Built to last

The Vitocrossal 300 is constructed using only the highest quality materials. The Inox-Crossal vertical heat exchanger surface is made of high-grade SA 240-316 Ti stainless steel - ideal for condensing applications.

Corrosive condensate simply drains downward off the smooth surfaces, effectively self-cleaning the heat exchanger and extending the operational life of the boiler, while reducing maintenance costs.

Inox-Crossal heat exchanger

Product details

Fuel type

Natural gas (NG) or liquid propane gas (LPG)


638 to 3361 MBH (187 to 985 kW) depending on model


626 to 3252 MBH (183 to 953 kW) depending on model

Combustion efficiency

Up to 98.3%


1228 to 3344 lbs (557 to 1520 kg) depending on model


Limited 8 year commercial warranty. See warranty sheet for details.

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