Oil Fired Boiler Ratings part 12, Reviews of the Warmflow, Weil-Mclain, Westcast, Williamson, Wolf, and Worcester brands

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This brand is available in the U.K. The units are available in several models such as a utility model, combi model, and the KABIN PAK outdoor mounted model. The guarantee on the boilers (especially the water jacket) is not very good when compared to other brands.


The ULTRA SERIES units (shown here) are three pass units that can be chimney or direct vented. They have a swing open burner door for easy cleaning.

The WGO models are basic heating only boilers that are available in three sizes while the WTGO units have a built in domestic hot water coil. They have an optional Advanced Features Module for better control including outdoor reset and domestic hot water.

The warranty is not as good as most of the other brands and they are only available through their authorized contractors.


This brand is a part of Mestek. The SERIES 8HE boilers feature a swing-out burner door for easy maintenance and a built-in air elimination port. The units are backed by a decent guarantee but are only available through a very limited dealer network in parts of Canada and the USA.


The OWB units are chimney vented units with a swing open burner door for easy cleaning. They are available in four sizes to match the heating needs of the home and also offer an optional two stage fuel unit. The OWT units have a built in domestic hot water coil. The OSB units are for steam heating systems. The warranty on the units is good. 


These units are made in Germany. The COB units are condensing units for central heating and feature a two stage blue flame burner and balanced flue for efficiency. The COS-ES unit has an integrated domestic hot water tank. The warranty on the units is not as good as other brands. 


This brand is a part of the BOSCH GROUP and is made/sold in the U.K. The GREENSTAR DANESMOOR range consists of system boilers in 18, 25, and 30kw sizes. They also offer combination units that provide domestic hot water. All of the units are available in internal and external mounted models. 

Other Oil Fired Boiler Brand Ratings

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