Ariston

Brands include; Euro Combi, Bravo, Clas, Excalibur, E Combi, E System, DIA, Euro Prisma, Genus, Eco Genus, Intesa, Micro Combi, Micro Genus, Micro System, Contract, Comfort, Eureka.

http://www.ariston.com/uk/Homeowner/Ariston_Product_Manuals

Baxi, Potterton, Main.

Brands Baxi Combi and Baxi Solo

http://www.baxi.co.uk/gas-boilers/discontinued-products.htm

Potterton

http://www.potterton.co.uk/discontinued/

Main

http://www.mainheating.co.uk/discontinued/

Bunderus

http://www.buderus.co.uk/downloads/manuals/discontinued-product-literature.html

Ferroli

Brands; Arean, Domi Compact, Exrema, Falcon Ferolli, Modena, Maxima, Optima, Optimax, Sigma, Tempra,

http://www.ferroli.co.uk/documents

Glow Worm,

Glow Worm Brands; Flexicom, Ultracom, Hideaway, Easycom, Micron, EnergySaver, EnergySaverCombi, BetaCom, Ultamit, HXi, Ultra Power

http://www.glow-worm.co.uk/after-sales/discontinued-products/

Heatline

Brands; Compact, Sargon, Solaris, Vizo, Vizo Plus

http://www.heatline.co.uk/literature/

Ideal

Includes brands; Wickes, Istor, Mexico, Compact, Elise, Esprit, Europa, Icos, Sprint, British Gas.

http://idealheating.com/product-literature/dicontinued-products.php

Keston; http://www.keston.co.uk/our-products/discontinued-products/

Malvern Boilers

http://www.malvernboilers.co.uk/brochures_manuals.html

Myson

http://freeboilermanuals.com/myson_1.htm

RavenHeat

http://www.ravenheat.co.uk/index.php/products/literature

Remeha Heating

Brands; Avanta, Celcia

http://www.remehaheating.co.uk/installer/products/product-documentation/

Sunar Duval

Models, Ecosy, Enviroplus, Isofast, IsoMax, Opalis, Semina, SD 30e, Condens, Thelia, Thema Condens, Thema 23, Themaclassic, Xeon

Saunier Duval boiler manuals are currently officially unavailable you can contact the Vaillant group http://www.vaillant-group.com/brands/?set_language=2

Or find then here;

http://freeboilermanuals.com/sauner_duval_1.htm

Vaillant Group; (Vaillant, Glow Worm, Sunar Duval)

Vaillant

Vaillant Brands; Eco Max, Turbo Max, Eco Tec, Aqua Plus, Auro Matic

http://www.vaillant.co.uk/downloads/product-Information/discontinued-products/

Vokera;

Includes Brands Sabre, Linea, Mynute, Eclipse, Syntesi

http://www.vokera.co.uk/trade-professionals/manuals-literature/

Worcester;

Brands; Greenstar, Junior, Si, CDi, RSF, HighFlow

http://www.worcester-bosch.co.uk/installer/literature/discontinued-product-literature/discontinued-gas-boiler-literature