Understanding your condensing boiler

Since 2005 the Building Regs have made it compulsory to fit an efficient condensing boiler when replacing an old model. Older boilers that did not use condensing technology would waste around 30-50% of the heat they generated by allowing it to escape through the flue, while condensing boilers are able to use the heat in the flue to preheat the water coming into the boiler. As a result, where an older boiler would