System Boilers

Baxi 600 System 2

The Baxi 600 System 2 can be manually converted between natural gas or LPG without the need to purchase an accessory kit.

The system boiler is compatible with Megaflo and Baxi cylinders for that industry leading hot water performance.

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Features and Benefits
Product Literature
Dimensions
Technical Specification

Features and Benefits

Multiple outputs

Available in outputs of 15, 18 & 24kW, natural gas or LPG manual conversion

Safer and cleaner

Combined PrV with separate drain to facilitate a safer and clearer boiler drain down for repair

Robust components

Brass hydraulics and stainless steel heat exchanger for peace of mind

Self-serve

Easy-Fill 2 permanent filling link enabling homeowner self-top up of system pressure to prevent engineer call outs

Quicker installation

Compatible with Baxi Easy-Flue for a safer and quicker one-person fit installation from inside the property

Pressure gauge

External analogue pressure gauge - for easy self-top up, to help prevent call outs

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Calling Baxi installers - Double points are back!

We’re giving you ‘double the oomph’ with our double points promotion running 1st April – 30th June 2025.

All you need to do is install and register any Baxi 600 and 800 boilers on our loyalty scheme Baxi Works* and those double points are yours!

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Product Literature

Manuals

User Guides

Specification Guides

Data Sheets

Product Fiche

Energy Labels

CAD

Dimensions

A: Boiler Width = 395mm

B: Boiler Height = 700mm

C: Boiler Depth = 285mm

D: Side Clearance = 2.5mm

E: Upper Clearance = 178mm

F: Lower Clearance = 200mm

G: Front Clearance = 5mm in operation (450mm for servicing)

Technical Specification

Product Model	15 System	18 System	24 System
Product Code	7844720	7844722	7844723
Gas
Natural gas or LPG	Natural Gas	Natural Gas	Natural Gas
Inlet supply pressure (natural gas) (mbar (nominal))	20	20	20
Maximum Gas Rate (G20) Qmax (m³ / hr)	1.64	1.96	2.61
Heat Input CH (kW (max) Gross (QnHs))	17.2	20.6	27.4
Heat Input CH (kW (min) Gross (QnHs))	5.2	5.2	5.2
Heat Output CH (non-condensing) (kW (Max) (Pn))	15	18	24
Heat Output CH (non-condensing) (kW (Min) (Pn))	4.5	4.5	4.5
Heat Output CH (condensing) (kW (Max) (Pnc))	16.2	19.4	25.8
Heat Output CH (condensing) (kW (Min) (Pnc))	4.9	4.9	4.9
Heat Input domestic hot water (DHW) (kW max gross (QnwHs))	N/A	N/A	N/A
Heat output domestic hot water (DHW) (kW max)	N/A	N/A	N/A
Water heating efficiency class	N/A	N/A	N/A
Electrical
Permanent live required	Yes	Yes	Yes
External fuse rating (on connection board) (Amps)	3	3	3
Pump overrun	Yes	Yes	Yes
Integral 'boiler only' frost thermostat	Yes	Yes	Yes
Hydraulic
Maximum DHW flow rate (Delta T @ 35'C rise) (l/min)	N/A	N/A	N/A
Minimum DHW flow rate required (l/min)	N/A	N/A	N/A
Minimum operating DHW pressure required (bar)	0.5	0.5	0.5
Integral expansion vessel (litres)	7	7	7
Maximum capacity of the CH system (litres)	100	100	100
Integral automatic bypass	Yes	Yes	Yes
Weights
Installer Lift Weight (kg)	28.9	28.9	28.9

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Baxi Genuine Parts

Whether you are working on an installation, repair or service, Baxi Genuine Parts are guaranteed for quality, reliability and safety. Start here to find the parts you need.

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Product Training

Our training courses are held in our state-of-the-art training centres, several with CIPHE approval, by experienced, qualified engineers who know what the job is like.

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Error Codes for Baxi Boilers

If a boiler develops a problem, it will display an error code. We explain the most common error codes here.

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Baxi Works

Baxi Works is our installer loyalty scheme, designed to prioritise you, support you and reward you for choosing Baxi.