Dave L. did a great job! Our boiler stopped working so we had no heat or hot water. Dave took the time to figure out the primary problem and also showed me that the gasket was cracked and crumbling causing a water leak and the membrane in one of the tanks had ruptured. He replaced and fixed everything and I am happy I did not need to replace the entire boiler. I feel confident that the job was done correctly, and I am happy to have heat and hot water again.