The answer to 'why is my boiler high energy bills' is that there are several common causes, including a malfunctioning thermostat, poor insulation, sediment buildup, and leaks in the system. These issues can lead to the boiler working harder and consuming more energy to heat your home, resulting in higher energy bills.
Some common symptoms of these problems include uneven heating, strange noises coming from the boiler, and the boiler cycling on and off more frequently. Solutions can range from simple DIY fixes like replacing the thermostat or bleeding the radiators, to more complex issues that require a professional HVAC technician to diagnose and repair, such as repairing leaks or flushing the system to remove sediment.