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Baxi 600 Combi LPG

This compact, powerful boiler can be operated using smart controls through an app on your phone or tablet.

  • Features
  • Dimensions
  • 7 year parts and labour warranty*
  • Built in the UK using top quality brass components
  • Fits inside a standard kitchen cupboard
  • EasyFill makes it easy to top up the central heating system pressure without the need to call an engineer
  • For homes off the mains gas network - could save money on fuel bills

*Terms and Conditions apply.


  • Boiler width = 390mm
  • Boiler height = 700mm
  • Boiler depth = 285mm
  • Side clearance = 5mm
  • Upper clearance = 178mm
  • Lower clearance = 200mm
  • Front clearance = 5mm in operation, 450mm for servicing

Installer Information

Technical Features

  • 24kW, 30kW and 36kW
  • Compact cupboard fit
  • Pipes behind facility within boiler casing
  • Only 29.5kg lift weight
  • Easy-Fill permanent filling link makes it easier for householder to top up system
  • Brass hydraulics block
  • OpenTherm interface
  • Compatible with uSense smart control
  • Simple hanging bracket
  • Choice of flue lengths
  • Combine this product with a uSense to be Boiler Plus compliant - Find out more


BAxi 200 Combi
  • Boiler width = 390mm
  • Boiler height = 700mm
  • Boiler depth = 285mm
  • Side clearance = 5mm
  • Upper clearance = 178mm
  • Lower clearance = 200mm
  • Front clearance = 5mm in operation, 450mm for servicing

Technical Data Table

Baxi 600 Combi LPG 624 Combi 630 Combi
Sales Code

Boiler only

7703803            7703804             


User adjustable DHW temperature Range - 35° to 60° Yes Yes
User adjustable CH temperature Range - 25°to 80° Yes Yes
Temp/status/fault diagnosis display LCD display LCD display
uSense Wired (optional accessory) 7649277 Optional Optional
Integral 24 hr Electro-mechanical timer   No No
Wired 24hr Electro-mechanical timer (optional accessory) 720971401 Optional Optional
7 Day RF Digital Programmable Room Thermostat (optional accessory) 720030501
Optional Optional
Single Channel Wired Programmable Room Thermostat (optional accessory) 7212438
Optional Optional
Single Channel Wired Timer (optional accessory)
7212444 Optional Optional
Wired room Thermostat (optional accessory) 720971601 Optional Optional
Wired Outdoor Weather Sensor (optional accessory)
7686478 Optional Optional
Baxi iFOS (optional accessory) 7683084
Baxi Easy-Fill 7665482
Yes Yes
Water heating efficiency class A A
Natural gas   No No
Propane LPG   Yes Yes
Inlet supply pressure (natural gas)
mbar (nominal)
37 20
Maximum Gas Rate (G20) Qmax m3/hr 1.98 3.26
NOx mg/kWh 29.7 28.3
NOx class   6 5
Heat input CH kW (Max) Gross (QnHs) 22.9  22.86
kW (Min) Gross (QnHs) 6.9 6.87
Heat output CH (non condensing)
kW (Max) (Pn) 20 20
kW (Min) (Pn)
6.1 6.2
Heat output CH (condensing)
kW (Max) (Pnc)
21.2 21.6
kW (Min) (Pnc) 6.7 6.7
Heat input domestic hot water (DHW)
kW max gross (QnwHs) 25.8 30.93
Heat output domestic hot water
kW max 25.8 30.93
SAP 2009 Annual Efficiency (PCDB/SEDBUK)
  89% 89%
ErP Product Information
Seasonal Space Heating Energy Efficiency   93% 93%
Sound power level, indoors LWA dB 47 48
Space heating efficiency class   A A
Water heating declared load profile   XL XL
Water heating efficiency class   A A
Electrical supply Volts / Hz
230V / 50Hz
230V / 50Hz
Permanent live required
  Yes Yes
Electrical cable supplied
(0.75mm heat resistant flex) No No
Power consumption when firing
68 80
External fuse rating
Amps 3 3
Internal fuse rating
Amps F2A H250V F2A H250V
Boiler IP rating (electrical protection) without integral timer fitted
Approval category IPX5D IPX5D
Circulating pump exercise feature   Yes Yes
Pump overrun
  Yes Yes
Integral 'boiler only' frost thermostat
Yes Yes
Hanging Bracket
  Yes Yes
Isolating valves with pre-formed copper tails
  Yes Yes
Gas supply pipe size
(mm) 22 22
Central heating connections
(mm) 22 22
Domestic Hot Water connections
(mm) 15 15
Condensate discharge pipe connection
(mm) 21.5 21.5
Safety discharge pipe connection
(mm) 15 15
Pre-plumbing jig accessory (optional accessory)
7682545 Yes Yes
Rear pipework kit (optional accessory) 7682790 Yes Yes
Temporary flexible filling loop (optional accessory)
248221 Yes Yes
Remote secondary PRV kit (optional accessory)
5121379  Yes Yes
Maximum DHW flow rate (Delta T @ 35ºC max) l/min 10.2 12.2
Minimum DHW flow rate required
l/min 2 2
Minimum operating DHW pressure required
bar 0.5 0.5
Maximum DHW system pressure
bar 8 8
Safety discharge pressure bar 3 3
Compartment ventilation required   No No
Easy-Fill permanent filling loop supplied
  Yes Yes
Integral expansion vessel
  7 7
Maximum capacity of CH system   100 100
Integral automatic bypass
  Yes Yes
CH System Inhibitor Required
  Yes Yes
Concentric flue systems
Concentric flue diameters
mm 60/100 and 80/125
60/100 and 80/125
Standard telescopic horizontal flue (60/100mm)
mm 315-500 315-500
Standard horizontal flue kit (60/100mm) mm 685 685
Max equiv length horizontal/vertical (60/100mm) m 10 10
Max equiv length horizontal/vertical (80/125mm)
m 20 20
Equivalent length per 135º bend
m 0.5 0.5
Equivalent length per 93º bend
m 1 1
Installer lift weight (boiler)
Max (kg) 29.2 29.2
Gross packaged boiler weight
(kg) 32.5 32.5

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