Baxi 400 Combi LPG Boiler

Baxi 400 Combi LPG

All the benefits of a high efficiency boiler for homes using LPG. Compact, easy to maintain and delivers excellent flow rates.

  • Features
  • Dimensions
  • uSense
Baxi 400 Combi LPG


  • Fits in a 290mm cupboard
  • Easy to use controls
  • 5 year warranty*
  • Can be operated using a smart phone or tablet
  • Meets minimum energy efficiency rating required for Boiler Plus compliance

*Terms & conditions apply

Baxi 400 Combo LPG


  • Boiler width = 395mm
  • Boiler height = 700mm
  • Boiler depth = 279mm
  • Side clearance = 5mm
  • Upper clearance = 178mm
  • Lower clearance = 200mm
  • Front clearance = 6mm in operation, 450mm for servicing


  • More control – schedule your heating to fit in with your lifestyle
  • More flexibility – control your heating from your smartphone or tablet
  • More savings – see how much energy you’re using. Enjoy maximum efficiency and manage your bills

Find an installer to get a price

Contact your local installer to get a free quote for this boiler.

See your local installers

Download user guide

For operation and maintenance advice, download the user guide.

Baxi 400 Combi LPG user guide

Compare with your boiler

Find out how much you could save by installing a new boiler.

Efficiency calculator

Installer Information

  • Technical Features
  • Technical Data Table
  • Technical Literature
  • Product Training
  • Dedicated 28kW LPG model 26kg lift weight easy to handle
  • Optional stand-off frame
  • Rigid filling loop
  • Simple hanging bracket
  • Choice of flue lengths
Baxi 400 Combi 28 Combi LPG
Sales code Boiler only 7676760
Accessories and controls
Concealed user controls No
Operating mode selector switch with reset Yes
User adjustable DHW temperature Range - 35°C to 60°C Yes
User adjustable CH temperature Range - 35°C to 60°C Yes
Temp/status/fault diagnosis display LCD display
Integral 24 hr electro-mechanical timer (247206) Optional
Integral 24 hr electro-mechanical timer (247206) Optional
Plug-in 24 hr mechanical timer combi (7658276) Optional
Plug-in 7 day digital timer combi (7658523) Optional
Plug-in receiver 24 hr RF programmable mechanical room thermostat-combi (7658781) Optional
Plug-in receiver 7 day RF digital programmable mechanical room thermostat-combi (7658789) Optional
Single channel 7 day wired programmable room thermostat-combi (7212438) Optional
Single channel wired timer (7212444) Optional
Room thermostat (720971601) Optional
Baxi 200 and 400 stand off kit (7659335) Optional
SAP 2009 annual efficiency (PCDB / SEDBUK) % 89
NOx class 5
ErP Product Information
Nox mg/kWh 40
Sound power level, indoors LWA dB 50
Space heating efficiency class A
Water heating declared load profile XL
Water heating efficiency class A
Heat input CH kW (Max) Gross (QnHs) 27.42
kW (Min) Gross (QnHs) 5.44
Heat output CH (non condensing) factory setting kW (Max) (Pn) 20
kW (Min) (Pn) 4.8
Heat output CH (condensing) factory setting kW (Max) (Pnc) 21.8
kW (Min) (Pnc) 5.2
Gas supply pipe size (mm) 22
Inlet supply pressure (natural gas) mbar (nominal) 20
Maximum Gas Rate (nat Gas after 10 mins) m3/hr 3.06
Mechanical and hydraulic
Heat input domestic hot water (DHW) kW max gross (QnwHs) 32.1
Heat output domestic hot water kW max 28
Maximum DHW flow rate (Delta T @ 35ºC max) l/min 11.5
Minimum DHW flow rate required l/min 2
Minimum operating DHW pressure required bar 0.15
Maximum DHW system pressure bar 8
Safety discharge pressure bar 3
Compartment ventilation required No
Electrical supply Volts/Hz 230V/50Hz
Permanent live required Yes
Electrical cable required core 3 x 0.75
Power consumption when firing Watts 94
External fuse rating Amps 3
Internal fuse rating - connection board Amps 0.5
Internal fuse rating - Main PCB board Amps 1.6
Boiler IP rating (electrical protection) without integral timer fitted Approval Category IPX5D
Circulating pump exercise feature Yes
Pump overrun Yes
Integral 'boiler only' frost thermostat Yes
Concentric flue system
Standard telescopic concentric flue Length in mm 315-500
Horizontal concentric (60/100mm) Max equivalent length (m) 10
Reduction Per 135º bend (m) 0.5
Reduction Per 93º bend (m) 1
Horizontal concentric (80/125mm) Max equivalent length (m) 20
Installer lift weight (boiler) Max (kg) 26
Gross packaged boiler weight (kg) 30.5

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.

Book a training course.