The answer to 'when to service boiler' is that you should have your boiler serviced annually by a professional HVAC technician. Regular maintenance is essential to ensure your boiler is operating safely and efficiently. This annual service will typically include a thorough inspection, cleaning, and any necessary adjustments or minor repairs.
Servicing your boiler on a yearly basis helps prevent breakdowns, extends the lifespan of your equipment, and can even improve energy efficiency, saving you money on utility bills. It's also important to have your boiler serviced if you notice any unusual noises, leaks, or changes in performance.