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Rotex GCU 35 Gas - Boiler Efficiency Ratings

Boiler Efficiency Rating

You can find out the energy efficiency of your boiler by checking its energy rating; you can do this now by selecting the make and model below.

A boiler’s energy rating is an indicator of its efficiency when used within an average domestic household. It's a great benchmark for comparing new boilers and can help you work out how much money you could save on energy bills if you replaced your current boiler with a more efficient model.

For new boiler installations call British Gas Boilers on 0333 230 5216 for a no-obligation quote. Alternatively visit Boiler Guide to request quotes from independent local and regional heating engineers.

Rotex GCU 35 Efficiency

SAP seasonal efficiency89.9%
Rating bandBand B


ManufacturerRotex Boilers
ModelGCU 35
Fuel TypeGas
Flue TypeOpen or Room-Sealed
FanFan Assisted
Output (kW)35 - 35
Boiler ID
Manufactured From/To2005 - current


The Rotex GCU 35 is a 'B' rated boiler which has good efficiency of 89.9%.

The GCU 35 is a Condensing Combi boiler with a maximum power output of 35kw that uses Gas as its fuel source.

As this boiler is 'B' rated it will provide efficient heating and subseqently reduce fuel bills and carbon dioxide emissions.

Similar Rotex Boilers to the GCU 35
(Condensing Gas Combi)

Results ordered by efficiency. Some models may be obsolete.

Most Efficient Combi Gas Boilers