The answer to 'boiler high energy bills' is that there are several common causes, including a malfunctioning thermostat, a dirty boiler, poor insulation, and leaks in the system. Symptoms may include the boiler running constantly, uneven heating, and higher than normal energy bills. Solutions can range from simple DIY fixes like cleaning the boiler or adjusting the thermostat, to more complex issues that require a professional HVAC technician to diagnose and repair, such as replacing a faulty thermostat or repairing leaks in the system.
It's generally best to start with some basic troubleshooting steps, but if the issue persists or you're unsure of the cause, it's recommended to call in a professional HVAC technician to inspect the boiler and provide an expert assessment and repair recommendations.