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Worcester Heat Slave 12/14.OSO Oil - Boiler Efficiency Ratings

Boiler Efficiency Rating

You can check your boilers rating by selecting it's make and model below. Ratings are based on the SEDBUK Rating which is an indicator of its efficiency when used within an average domestic household, it's a great benchmark for comparing new boilers and also assessing whether your current boiler would be better off being replaced due to low efficiencies.

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Worcester Heat Slave 12/14.OSO Efficiency

SAP seasonal efficiency81.8%
Rating bandBand D


ManufacturerWorcester Boilers
ModelHeat Slave 12/14.OSO
Fuel TypeOil
Flue TypeOpen
FanFan Assisted
Output (kW)12 - 14
Boiler IDC14769/2-1
Manufactured From/To1997 - current


The Worcester Heat Slave 12/14.OSO is a 'D' rated boiler with an efficiency of 81.8%.

The Heat Slave 12/14.OSO is a Non-Condensing Combi boiler with a maximum power output of 14kw that uses Oil as its fuel source.

Being a 'D' rated boiler it would be worthwhile replacing it with a higher efficiency 'A' rated boiler.

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