I installed a new Crown Bermuda Series gas boiler (single pipe steam system) in 2012. The system worked very well for 5 heating seasons. During season 6 in 2018, I noticed a loud hissing sound and steam when the boiler was running for an extended amount of time, indicating a crack in boiler tank that is above the water line. Up until this time, there was no water loss in the boiler. I would flush a small amount of rusty water from the bottom of the tank every few weeks and refill, but nothing else. When I called Crown (now called Velocity Boiler Works) to ask about their warranty on the tank (the heat exchanger) the representative told me that any crack above the water line is not covered under warranty because that type of crack indicates a "maintenance issue" caused by "waterside corrosion" or "fireside corrosion". She then began to drill me with questions like "Did I have the tank deep cleaned every year", was my plumber qualified, did I misuse the boiler. It seemed like she was trying to prevent me from even making a warranty claim. Any boiler should last more than 6 years under normal operating conditions. Now I am facing the cost of an entirely new system to replace the Crown. I would not recommend this product and the customer service is terrible.