Baxi 800 System 2

Baxi 800 System 2 - System Boilers

System Boilers

Baxi 800 System 2

The Baxi 800 System 2 can be manually converted between natural gas or LPG without the need to purchase an accessory kit.


The system boiler includes a compact Adey Magnaclean Micro2 system filter to protect the boiler and heating system.

Features and Benefits

Multiple outputs

Available in outputs of 18, 24 and 30kW, natural gas or LPG

Safer and cleaner

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


Colour-coded and removable wiring blocks to save time during installation 

Quicker installation

Compatible with internal fit telescopic flue for a safer and quicker one-person fit installation from inside the property


Positive fit PrV connection pipe to save time on installation – can be fitted first or last in the pipework installation sequence
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Product Literature

Installation and Service Manuals

Installation and Service Manuals

User Guides

User Guides

Specification Guides

Specification Guides

Product Documentation

No documentation available.

Product Fiche

Product Fiche

Product Documentation

No documentation available.

Energy Labels

Energy Labels

Baxi Duo-tec Compact Combi Boiler Dimensions


A: Boiler Width = 390mm

B: Boiler Height = 700mm

C: Boiler Depth = 285mm

D: Side Clearance = 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 784472078447227844723
Natural gas or LPG Natural GasNatural GasNatural Gas
Inlet supply pressure (natural gas)mbar (nominal)202020
Maximum Gas Rate (G20) Qmaxm³ / hr1.641.962.61
Heat Input CHkW (max) Gross (QnHs)17.220.627.4
kW (min) Gross (QnHs)
Heat Output CH (non-condensing)kW (Max) (Pn)151824
kW (Min) (Pn)
Heat Output CH (condensing)kW (Max) (Pnc)16.219.425.8
kW (Min) (Pnc)
Heat Input domestic hot water (DHW)kW max gross (QnwHs)N/AN/AN/A
Heat output domestic hot water (DHW)kW maxN/AN/AN/A
Water heating efficiency class N/AN/AN/A
Permanent live required YesYesYes
External fuse rating (on connection board)Amps333
Pump overrun YesYesYes
Integral 'boiler only' frost thermostat YesYesYes
Maximum DHW flow rate (Delta T @ 35'C rise)l/minN/AN/AN/A
Minimum DHW flow rate requiredl/minN/AN/AN/A
Minimum operating DHW pressure requiredbar0.50.50.5
Integral expansion vesselSize (litres)777
Maximum capacity of the CH systemLitres100100100
Integral automatic bypass YesYesYes
Installer Lift Weight(kg)28.928.928.9

Contact your ASM

If you are a merchant or installer, your local Baxi representative is here to help.

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