SEDBUK stands for 'Seasonal Efficiency of a Domestic Boiler in the UK', and provides a fair comparison of the energy performance of different boilers. -->What difference can an energy efficient boiler make ? 

•  It produces less CO2
• It will consume less fuel 
•  It can therefore significantly reduce gas heating costs

 How is a SEDBUK rating calculated ?  SEDBUK refers to the average annual efficiency achieved in typical domestic conditions, and the rating is calculated using:

• The pattern of usage and typical domestic usage patterns
• The UK climate 
• Boiler type
• Ignition
• Fuel used
• Internal store size

Step One:  A SEDBUK rating assesses what percentage of the fuel that the boiler consumes is converted into heat. Step Two: That percentage is given a rating using a scale from 'A' (at the highest level of efficiency) to 'G'.It's a way of estimating annual fuel running costs, and all new boilers should be SEDBUK Band A or B rated except in some specific circumstances.High efficiency range 

• Baxi Platinum Combi HE A
•  
• Baxi Duo-tec Combi HE A
• Baxi Solo HE
•  
• Baxi Megaflo 
•  System HE A
• form part of Baxi's high efficiency range. 
•  They carry a SEDBUK Band A rating and are

 amongst the most efficient boilers on the UK market.