How are high-efficiency condensing boilers more efficient than standard efficiency boilers?
High-efficiency condensing boilers are able to capture and use much of the heat that old non-condensing boilers waste and release into the atmosphere. Condensing boilers convert around 90% of fuel into useful heating, whereas old conventional boilers only convert around 60% and waste the rest. All new gas boilers in England and Wales must be condensing boilers.
