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Baxi 818 18kW System Gas Boiler

From: £2,179.00

Get a quote to install this boiler.




818 18kW System Gas Boiler

Is Condensing


Efficiency Rating


Band Rating

A Rating

LPG Compatible


Standard Warranty

10 Years

Central Heating Max. Output



Wall Mounted

Flow Rate


ERP Rating

A Heat

Product Description

Designed and manufactured by Baxi, the 818 is a highly efficient condensing system gas boiler with an output rating of 18 kW.

How efficient is the Baxi 818?

This unit features a seasonal efficiency rating of 93% and ErP A-rating which makes the 818 a highly efficient system boiler.

What is the output rating of the Baxi 818?

An output rating of 18 kW means that the Baxi 818 is best suited to properties of a medium-size that don’t have such an excessive need for heating and hot water.

What options are available in this range?

If a system boiler isn’t what you’re looking for then combi boilers are also available. Plus, if the 18 kW unit isn’t suitable for your heating and hot water demands, then a 24 kW model is available too.

Where can this boiler be installed?

This is a wall-mounted compact unit that can be installed into a 290mm deep cupboard, allowing you to keep it out of sight and out of mind.

Can this boiler help to save you money?

The compact size of the 818 unit, helps to make the installation much simpler, which will save you money straight away. Once installed, the highly efficient performance will help to keep your energy bills down.

What are the features of the Baxi 818?

The Baxi 818 gives you plenty of control as you can make adjustments using your smartphone or tablet. More features of this system boiler include an ADEY Micro2 magnetic system filter that provides industry leading protection, all pipes fit behind the unit, front service access to all components, brass hydraulics block, central top flue and extensive flue options of up to 20m – making the unit flexible in where it can be installed. The 818 also comes with an OpenTherm interface, optional built-in mechanical 24 hour timer, multifit flue kit compatibility, In Flue Outdoor Sensor (IFOS), outdoor weather sensor, pre-plumbing jig with permanent easy filling link and performed copper tails as well as a built-in frost thermostat.

Would a system boiler suit your home?

As a system boiler, this unit directly heats your central heating system and hot water for a storage cylinder. Most of the important parts of the hot water and heating system, such as the pump and expansion vessel, are built into a system boiler – making it quicker and cleaner to install. System boilers offer a fast response to demand for heating and hot water and the advantage of not needing a feed and expansion tank in the loft.

How long is the warranty period?

Baxi 818 boilers come with a lengthy 7 year warranty as standard, helping to give you peace of mind that you’re installing a highly reliable boiler.

All Baxi 800 system boilers have been certified to run on a hydrogen blend of 20%.