With recent changes in the building regulations, the use of standard efficiency oil boilers has reduced and replaced by our range of SEDBUK A high efficiency products. In certain applications in some geographical regions of the UK our SEDBUK C standard efficiency product is still acceptable and will operate very efficiency when commissioned by a qualified OFTEC engineer. As with all oil boilers, it is important for the appliance to be sized and installed correctly. We can certainly help with sizing the boiler and advise on integrating the correct type of heating controls. On standard efficiency oil boilers our range covers from 15kw (50,000 btus) up to 69kw (220,000btus). Full details of SEDBUK ratings and efficiencies can be found on www.sedbuk.com.