News, Views & Reviews on Domestic Central Heating, Boiler & Renewable Energy


Get Free, No Obligation Boiler Quotes

Saunier Duval SD Isotwin Condens F35 E LPG - 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.

For new boiler installations call British Gas Boilers on 0800 327 7119 for a no-obligation quote, alternatively visit Boiler Guide to request quotes from independent local and regional heating engineers.

Saunier Duval SD Isotwin Condens F35 E Efficiency

SAP seasonal efficiency92%
Rating bandBand A


ManufacturerSaunier Duval Boilers
ModelSD Isotwin Condens F35 E
Fuel TypeLPG
Flue TypeRoom-Sealed
FanFan Assisted
Output (kW)28 - 28
Boiler ID
Manufactured From/To2005 - current


The Saunier Duval SD Isotwin Condens F35 E is an 'A' rated boiler which has an excellent efficiency of 92%.

The SD Isotwin Condens F35 E is a Condensing Combi boiler with a maximum power output of 28kw that uses LPG as its fuel source.

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

Similar Saunier Duval Boilers to the SD Isotwin Condens F35 E
(Condensing LPG Combi)

Results ordered by efficiency. Some models may be obsolete.

Most Efficient Combi LPG Boilers