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Baxi 618 18kW System Gas Boiler

From: £2,099.00

Get a quote to install this boiler.




618 18kW System Gas Boiler

Is Condensing


Efficiency Rating


Band Rating

A Rating

LPG Compatible


Standard Warranty

7 Years

Central Heating Max. Output



Wall Mounted

Flow Rate


ERP Rating

A Heat

Product Description

The Baxi 618 is a condensing system gas boiler designed for wall-mounted installation within a cupboard.

How efficient is the Baxi 618 system boiler?

Baxi 618 is a highly efficient boiler, as shown by the 93% efficiency and ErP A-rating. Such high levels of efficiency means that it could help to lower your heating bills.

Is the output rating suitable for my home?

A central heating output rating of 18kW means that the 618 system boiler is best suited to properties with as many as 15 radiators.

Are any other system boilers available in the Baxi 600 range?

This 18 kW model isn’t the only option available in this Baxi boiler range. Additional output ratings of 15 kW and 24 kW are also an option as well as a completely different type of boiler altogether with combi and regular units included too.

Is a system boiler right for my home?

System boilers directly heat the 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 in on a system boiler – making it quicker and cleaner to install. It also means you get a faster response to demand for heating and hot water than a regular boiler and there’s no need for a feed and expansion tank in the loft.

How long is the warranty period?

Baxi 618 boilers feature a 7 year warranty as standard, giving you the peace of mind that it’s a highly reliable unit that won’t let you down.

What are the key features of the Baxi 618?

Some key features of the Baxi 618 include pipes behind facility within boiler casing, lightweight, it’s fully modulating, ease of service to save you money on future maintenance, front access to all components, a brass hydraulics block, central top flue and extensive flue options up to 20 metres to allow for flexible sitting.

How big is the Baxi 618 system boiler?

Designed for wall-mounted installation, the compact size of the 618 unit – 700x370x285mm (HxWxD) – means that it can be installed within a standard cupboard.

All Baxi 600 system boilers have been certified to run on a hydrogen blend of 20%.