Baxi Duo-tec Combi
Reliable and easy to install, you can be assured of the Baxi Duo-tec’s energy efficiency.
- Features
- Dimensions
- 7 year warranty*
- Instant hot water
- Easy to use controls
- Meets minimum energy efficiency rating required for Boiler Plus compliance
- Energy Saving Trust Endorsed
- Boiler width = 450mm
- Boiler height = 780mm
- Boiler depth = 345mm
- Side clearance = 5mm
- Upper clearance = 200mm
- Lower clearance = 150mm
- Front clearance = 5mm in operation, 450mm for servicing
Installer Information
Technical Features
- Easy to install
- 24, 28, 33, 40 kW
- Dedicated 28kW LPG model
- Easy to install and service
- Flow rate up to 16.4 l/min
- Full wall mounting jig
- Choice of flue lengths
- Compatible with uSense smart control using the 230v switch live
- Combine this product with a Time and Temperature control and IFOS to be Boiler Plus compliant - Find out more
Dimensions
- Boiler width = 450mm
- Boiler height = 780mm
- Boiler depth = 345mm
- Side clearance = 5mm
- Upper clearance = 200mm
- Lower clearance = 150mm
- Front clearance = 5mm in operation, 450mm for servicing
Technical Data Table
| Baxi Duo-tec Combi | 24 Combi | 28 Combi | 33 Combi | 40 Combi | 28 Combi LPG | |
| Sales code | 7219413 | 7219414 | 7219415 | 7219416 | 7219417 | |
| Controls | ||||||
| Concealed user controls | Yes | Yes | Yes | Yes | Yes | |
| On/off switch with reset | Yes | Yes | Yes | Yes | Yes | |
| User adjustable DHW temperature | Yes | Yes | Yes | Yes | Yes | |
| User adjustable CH temperature | Yes | Yes | Yes | Yes | Yes | |
| LED temp / status / fault diagnosis display | Yes | Yes | Yes | Yes | Yes | |
| Gas | ||||||
| Gas supply connection | mm | 22 | 22 | 22 | 22 | 22 |
| Natural gas | Yes | Yes | Yes | Yes | N/A | |
| LPG (propane) | N/A | N/A | N/A | N/A | 3 | |
| Nominal inlet supply pressure NG | mbar | 20 | 20 | 20 | 20 | N/A |
| Nominal inlet supply pressure LPG | mbar | N/A | N/A | N/A | N/A | 37 |
| Maximum gas rate | m3/hr | 2.61 | 3.1 | 3.6 | 4.36 | 2.25 Kg per hr |
| Heat input central heating | kW max gross (QnHs) | 22.7 | 27.4 | 32.1 | 36.4 | 27.4 |
| kW min gross (QnHs) | 7.8 | 10 | 10.8 | 11.0 | 10 | |
| Heat output CH non condensing | kW max (Pn) | 20 | 24 | 28 | 32 | 24 |
| kW min (Pn) | 6.8 | 8.7 | 9.4 | 9.6 | 8.7 | |
| Heat out CH condensing | kW max (Pnc) | 21.0 | 25.9 | 30.3 | 34.4 | 25.9 |
| kW min (Pnc) | 7.4 | 9.5 | 10.2 | 12.1 | 9.5 | |
| Heat input domestic hot water (DHW) | kW max gross (QnwHs) | 27.4 | 32.1 | 37.7 | 45.7 | 32.1 |
| Heat output domestic hot water | kW max (Pn) | 24 | 28 | 33 | 40 | 28 |
| Maximum domestic hot water flow rate | l/min @ 35oc | 9.8 | 11.5 | 13.5 | 16.4 | 11.5 |
| SAP 2009 annual efficiency (PCDB/SEDBUK) | % | 88.6 | 88.6 | 88.5 | 88.5 | 90.6 |
| Nox Class | 5 | 5 | 5 | 5 | 5 | |
| ErP Product information | ||||||
| NOx | mg/kWh | 20 | 23 | 20 | 23 | 23 |
| Sound power level, indoors | Lwa dB | 50 | 53 | 52 | 50 | 53 |
| Space heating efficiency class | A | A | A | A | A | |
| Water heat declared load profile | XL | XL | XL | XL | XL | |
| Water heating efficiency class | A | A | A | A | A | |
| Electrical | ||||||
| Electrical supply | Volts/Hz | 230V/50Hz | 230V/50Hz | 230V/50Hz | 230V/50Hz | 230V/50Hz |
| Permanent live required | Yes | Yes | Yes | Yes | Yes | |
| Fitted electrical cable |
1m x 3 core x 075mm2 on all models |
|||||
| Power consumption | Watts | 85 | 120 | 125 | 125 | 120 |
| External fuse rating | Amps | 3 | 3 | 3 | 3 | 3 |
| Internal fuse rating | Amps | F2L | F2L | F2L | F2L | F2L |
| Ingress protection rating (without electro-mechanical timer fitted) | IPX 5D | IPX 5D | IPX 5D | IPX 5D | IPX 5D | |
| 24 hour pump exercise | Yes | Yes | Yes | Yes | Yes | |
| Pump overrun | Yes | Yes | Yes | Yes | Yes | |
| Integral 'boiler only' frost thermostat | Yes | Yes | Yes | Yes | Yes | |
| Mechanical and hydraulic | ||||||
| Compartment ventilation requirement | None | None | None | None | None | |
| Pre-plumbing / wall mounting jig | Yes | Yes | Yes | Yes | Yes | |
| Flow and return pipe size | mm | 22 | 22 | 22 | 22 | 22 |
| Condensate discharge pipe size | mm | 21.5 | 21.5 | 21.5 | 21.5 | 21.5 |
| Integral automatic bypass | Yes | Yes | Yes | Yes | Yes | |
| Min domestic hot water flow rate | l/min | 2 | 2 | 2 | 2 | 2 |
| Min domestic hot water operating pressure | bar | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 |
| Maximum DHW system pressure | bar | 8 | 8 | 8 | 8 | 8 |
| Safety discharge pressure | bar | 3 | 3 | 3 | 3 | 3 |
| Integral expansion vessel capacity | litres | 8 | 8 | 10 | 10 | 8 |
| Max capacity of central heating system | litres | 125 | 125 | 155 | 155 | 125 |
| Filling loop included | Yes | Yes | Yes | Yes | Yes | |
| CH system inhibitor required | Yes | Yes | Yes | Yes | Yes | |
| Concentric Flue System | ||||||
| Standard telescopic horizontal flue kit length | mm | 315-500 | 315-500 |
315-500 | 315-500 | 315-500 |
| Max equiv length horizontal / vertical (60/100mm) | m | 10 | 10 | 10 | 10 | 10 |
| Max equiv length horizontal / vertical (80/125mm) | m | 20 | 20 | 20 | 20 | 20 |
| Equivalent length per 135o bend | m | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Equivalent length per 93o bend | m | 1 | 1 | 1 | 1 | 1 |
| Twin pipe flue system | ||||||
| Diameters | mm | 80/80 | 80/80 | 80/80 | 80/80 | 80/80 |
| Max equiv length horizontal / vertical (parallel pipes) | m | 15/15 | 15/15 | 15/15 | 15/15 | 15/15 |
| Equivalent length per 135o bend | m | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 |
| Equivalent length per 91.5o bend | m | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Weights | ||||||
| Max installation lift weight | kg | 40.2 | 40.2 | 41.7 | 42.2 | 40.2 |
| Gross packaged boiler weight | kg | 46 | 46 | 47.5 | 48 | 48 |
Technical Literature
Product Training
We offer product training at our training centres across the UK for installers who want to get hands-on with Baxi boilers.
From construction and installation to functions and features, our expert trainers will give you a complete understanding of working with Baxi boilers.
