I've owned this heater for four years and have been very satisfied with its performance and cost-saving benefits, despite the expected maintenance like cleaning the burn pan and ash buildup. To troubleshoot issues, I’ve found cleaning the oil pump inlet screen and drip nozzle essential for smooth operation, especially when clicking noises or off-center oil drips occur. Overall, with proper care and safety precautions, this heater has been a reliable investment, and I commend the Eliminator Heater company for offering such an effective product.