Question: how much does it cost to run an electric combi boiler?
Answer: Are Electric Combi Boilers Expensive to Run? It is estimated that the annual cost of using an electric combination boiler is around £1,800. However, for a 210-litre Thermaflow model, the annual cost is £2,025. The result is based on a total of 13,500 kWh at 15 pence per kWh.