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Buderus Products Floor standing condensing boilers SB745


The SB745 is available in the following kW outputs:
  • 800kW
  • 1,000kW
  • 1,200kW

Features and benefits

  • Efficiencies of up to 109% (NCV)
  • Stainless steel combustion and heat exchanging surfaces
  • Cascades up to 3 boilers with 4000 controls and with no limits using a building management systems (BMS)
  • Two return flow connections for separation of high and low temperature heating circuits
  • Low hydraulic resistance
  • For use with gas pressure jet burners
  • 3 pass construction
  • Combustion chamber optimised for lower emissions
  • Kondens+ heating surfaces

High performance

The SB range of high performance stainless steel condensing boilers deliver maximum efficiency levels, very low emissions and real cost savings.

Boilers in the range require minimal floor space and benefit from the very latest in heating technology.

Kondens+ heat exchanger

Patented Kondens+ heat exchanger surfaces create optimum conditions for condensing to occur, and there are two return connections for separation of high and low temperature heating circuits.

This improves the efficiency of the overall heating system and allows further energy savings to be made.


To ease transportation of the boiler the main block is delivered with the insulation and casing packed separately.

The total insulation of the boiler block increases efficiency by keeping heat losses to a minimum.

Boiler and system controls

Technical dataFile typeFile sizeDownload
SB745 Technical data sheetPDF386
CAD drawingsDWG33-38KB
Floor standing boilers
Hydraulic schematicsJPEG
SB boilers
Wiring schematic drawings - 4000 seriesJPEG
4211 Control schematics
4212 Control schematics
4321 Control schematics

Manuals download

Manual  File type   
Installation manual PDF Download (PDF 8.0 MB)
Operating instructions PDF Download (PDF 1.5 MB)
Water treatment manual PDF Download (PDF 0.4 MB)
Enhanced Capital Allowance Scheme (ECA)