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Baxi 818 System2 Boiler inc Horizontal Flue

From £1,160.00

The Baxi 800 System series comes with the compact Adey Magnaclean Micro2 magnetic system filter and a 10 year parts and labour warranty* for your peace of mind.

The boiler is small enough to fit into a 290mm deep cupboard, has a built in pipes behind facility within the boiler casing and brass hydraulics.

It is compatible with Megaflo Eco cylinders, making it the perfect choice for homes with high demand for hot water.

Outputs available:

18kW, 24kW, 30kW

SKU: N/A Categories: , , , Product ID: 548

Additional information

Weight 27.7 kg
Dimensions 28 × 39 × 70 cm

18kw, 24kw, 30kw

Flue Options

Baxi Multifit Horizontal Flue 60/100 (7222019), Baxi Multifit Vertical Flue 60/100 (5118576), Boiler Only – NO Flue

Features & Benefits

The Baxi 800 System 2 range has a 10-year parts and labour warranty and can be installed with a hot water cylinder, such as the Baxi cylinder or Megaflo Eco

  • 10-year parts and labour warranty
  • Includes an Adey Micro 2 Filter to protect your heating system and boiler
  • Compatible with Baxi uSense 2 smart thermostat, so you can control it using an app on your phone
  • Pre-heated condensate trap to prevent freezing in winter – less risk of frozen condensate pipes.


Technical Table Baxi 818 System 2 Baxi 824 System 2 Baxi 830 System 2
Sales Code 7814313 7814314 7814315
Natural gas or LPG Yes Yes Yes
Inlet supply pressure (natural gas) mbar (nominal) 20 20 20
Maximum Gas Rate (G20) Omax m³ / hr 1.97 2.61 3.26
Heat Input CH kW (max) Gross (OnHs) 18.6 24.7 30.9
kW (min) Gross (OnHs) 4.9 4.9 6.0
Heat Output CH (non-condensing) kW (Max) (Pn) 18 24 30
kW (Min) (Pn) 4.8 4.8 5.8
Heat Output CH (condensing) kW (Max) (Pnc) 19.9 26.3 32.4
kW (Min) (Pnc) 5.2 5.2 6.4
Heat Input domestic hot water (DHW) kW max gross (OnwHs) N/A N/A N/A
Heat Output domestic hot water (DHW) kW max N/A N/A N/A
Water heating efficiency class A 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 N/A N/A N/A
Minimum DHW flow rate required l/min 2 2 2
Minimum operating DHW pressure required bar 0.5 0.5 0.5
Integral expansion vessel Size (litres) 7 7 7
Maximum capacity of the CH system Litres 100 100 100
Integral automatic bypass Yes Yes Yes
Installer Lift Weight (kg) 29 30 30