Baxi 600 Combi 2

The Baxi 600 Combi 2 is compact, simple to use and comes with a seven-year parts and labour warranty*.

The Easy-Fill permanent filling link makes it easy when you need to top up the pressure, without having to call out an engineer. It is compatible with the Baxi uSense smart control that can be operated using a smart phone or tablet.

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*Terms and conditions apply

Baxi 600 Combi 2
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Features and benefits   |   Dimensions   |   Product literature   |   Technical specifications   |   Related products   |   FAQs

Features and benefits


  • A: Boiler Width = 395mm
  • B: Boiler Height = 700mm
  • C: Boiler Depth = 285mm
  • D: Side Clearance = 2.5mm
  • E: Upper Clearance = 178mm
  • F: Lower Clearance = 150mm
  • G: Front Clearance= 5mm in operation (450mm for servicing)
Baxi  600 Combi 2 Line Diagram_ALT
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Product literature

Technical specifications

  • 24kW, 30kW and 36kW Combi (Natural gas and LPG)
  • Compact cupboard fit
  • Brass hydraulics block
  • Built-in stand off frame
  • Certified OpenTherm
  • Simple hanging bracket
  • Vertical sleeve recyclable packaging
  • Combined PrV with seperate drain
  • Colour-coded and removable wiring blocks
  • Pre-heated siphonic condensate trap
  • Easy-fill 2 permanent filling link


  • View full technical specifications 
Technical Specifications   Baxi 624 Combi 2 Baxi 630 Combi 2 Baxi 636 Combi 2
Sales Code   7796586 7796587 7796588
Natural gas or LPG   Yes Yes Yes
Inlet supply pressure (natural gas) mbar (nominal) 20 20 20
Maximum Gas Rate (G20) Omax m³ / hr 2.61 3.26 3.9
Heat Input CH kW (max) Gross (OnHs)  20.6 25.7 25.7
  kW (min) Gross (OnHs) 4.9 6.0 7.2
Heat Output CH (non-condensing) kW (Max) (Pn) 20 25 25
  kW (Min) (Pn) 4.8 5.8 7.2
Heat Output CH (condensing) kW (Max) (Pnc) 21.8 27.1 27.1
  kW (Min) (Pnc) 5.2 6.3 7.6
Heat Input domestic hot water (DHW) kW max gross (OnwHs)  27.4 30.9 36.9 
Heat Output domestic hot water (DHW) kW max  24  30  36 
Water heating efficiency class   A A
Permanent live required   Yes  Yes  Yes 
External fuse rating (on connection board) Amps F0.5A L250VP F0.5A L250VP F0.5A L250VP
Pump overrun   Yes Yes Yes
Integral 'boiler only' frost thermostat   Yes Yes Yes
Maximum DHW flow rate (Delta T @35'C rise)  l/min 10.2  12.2  15.0 
Minimum DHW flow rate required   l/min 
Minimum operating DHW pressure required bar 0.5  0.5  0.5 
Integral expansion vessel Size (litres) 
Maximum capacity of the CH system Litres  100  100  100 
Integral automatic bypass   Yes  Yes  Yes 
Installer Lift Weight (kg) 28  29  30 

Baxi at Home

Why not grab a coffee and read our latest blog post.

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  • How old is my boiler?
  • How to reset a Baxi boiler 
  • What temperature should a boiler be set at?
  • How do I top up the water pressure?
  • The new My Baxi app for your uSense smart control 

We show you how to find out how old your boiler is from its serial number.

Read full FAQ

Read how to reset your boiler, whether it has a dedicated reset button, an ON/OFF/SELECTOR switch or a thermostat control knob.

Read full FAQ

We explain how to use your boiler controls and what temperature they should be set at.

Read full FAQ

It is quite simple to top up the water pressure in your boiler. You should be able to do it yourself without having to call a heating engineer. Watch our video to find out how. 

Read full FAQ

If you've got a Baxi uSense smart control, we tell you how to operate it from your smart phone using the new My Baxi app.

Read full FAQ