Viessmann Vitocrossal 300, CU3A Data Sheet
POWERFULLY SIMPLE.
Simply In Control.
Vitotronic 200 boiler and system control precisely
manages the entire heating system.
Simply Efficient.
Low NoX emissions with Viessmann MaxtriX
dome gas burner.
Simply Proven.
Lasting performance with Viessmann SA240 316 Ti
stainless steel Inox-Crossal heat exchanger.
INTRODUCING THE VITOCROSSAL 300 CU3A
A compact, gas-fired condensing boiler in a floor-standing design. The new
Viessmann Vitocrossal 300 CU3A is easy and simple to install in both new
construction and retrofit applications. 4 sizes up to 199 MBH. Multi-boiler
installation with 8 boilers up to 1592 MBH. No primary/secondary piping or
low-loss headers required. Best-in-class and industry-leading components
from Viessmann. Water cooled, stainless steel combustion chamber. MatriX
radiant dome gas burner with 5:1 turndown ratio for efficiency of 95% AFUE
and extremely clean combustion. Titanium stabilized SA 240-316Ti stainless steel
Inox-Crossal heat exchanger for maximum heat transfer and longevity.
Vitotronic 200 boiler and system control manages the entire heating system
with precise temperature control. Lambda Pro easily adjusts to various fuel
qualities and delivers optimum combustion efficiency.
If you’re ready for the best, we’re ready for you.
VITOCROSSAL 300 CU3A
HIGHLIGHTS
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 190°F.
Inox-Crossal heat transfer surface – 316 Ti stainless steel heat exchanger for efficient utilization of condensing technology –
self-cleaning effect via smooth stainless steel surfaces.
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.
Simple commissioning with no field adjustments. A self-calibrating Lambda Pro combustion management system ensures
optimal combustion efficiency at all times regardless of gas/air quality.
Easy conversion from natural gas to liquid propane with no orifice change.
Durable, reliable, and long service life with Inox-Crossal stainless steel
heat exchanger and high mass design.
Multiple venting options and configurations with vent lengths up to 198’.
Vitocrossal 300, CU3A
1
Vitotronic 200 control KW6B with graphic user interface
2
Water-cooled stainless steel combustion chamber
3
Modulating MatriX dome gas burner
4
Stainless steel Inox-Crossal heat exchanger
5
Highly effective thermal insulation
6
Flue gas collector with condensate drain pipe
7
Combustion air inlet connection
VITOCROSSAL 300 CU3A
Vitocros sal 300, CU3A g as-fired condensing boiler
Model 26 35 45 57
AFUE % 95 95 95 95
Minimum Input (NG) MBH 19 25 43 43
Maximum Input (NG) MBH 94 125 160 199
Net AHRI Rating MBH 76 101 12 9 161
Overall Dimension†
Width
Height
Depth (Length)
Weight lbs 269 275 341 352
Boiler Water Content USG 13.5 13 18.8 18.8
Heat Exchanger Surface ft.
Maximum Operating Pressure psig 30 30 30 30
Minimum Gas Supply Pressure
Natural Gas “w.c. 4 4 4 4
Liquid Propane Gas “w.c. 10 10 10 10
Boiler water temperature maximum
Adjustable high limit (AHL) range
space heating (steady state) 190˚ F 190˚ F 190˚ F 190˚ F
For latest technical data, visit uncompromise.us
Inches 26 26 26 26
Inches 67 67 67 67
Inches 27 27 31.5 31.5
²
16.7 20.7 34.1 34.1
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Learn more at
UNCOMPROMISE.US
5471213 06/2015 Printed in USA
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