3JH3 is some 7 yrs old but only done 730 hrs. I originally questioned the lack of anodes but was informed that the heat exchanger was aluminium alloy and didn’t need them! (Really?- I wonder what Nigel Calder would say??). I recently noticed some salt encrustration around the end cap of the exchanger and on removing it discovered that the ‘O’ ring had been assembled out of position, resulting in corrosion of the casting where the ‘O’ ring should have been, and also that the end cap had cracked. Despite the warranty having expired (obviously), the problem was an assembly fault from manufacture – no question! The agent was contacted over two months ago yet despite my numerous follow-ups to the agent, I had heard nothing from Yanmar. By chance (!), I met recently with a divisional manager who informed me that Yanmar “does not deal directly with customers”, and also that the user manual requires specific periodic inspection of the exchanger which I hadn’t done. The manual does NOT ! Yanmar has been totally uncommunicative, and now defensive – certainly not sympathetic. I could go on at considerable length, but sufficient to say that Yanmar’s mission statement is an absolute farce, and with the benefit of hindsight I would never choose Yanmar again. My experiences with them must rate as the most frustrating I have ever endured from any major company. They have now just informed me (after over two months delay) that they accept no responsibility - and it looks like I am expecting a bill of pehaps $1000 from the local agent to do a Belzona repair! I'm currently looking at pursuing action through the Consumer Guarantees Act. Anyway, good to know that there are some benefits for you living in Oz !