One of the first things I hooked up on my then-new boat in 2003 was the engine jacket water loop to the water heater. To this day I consider it one of the best modifications I ever made.
Hot water within 20-30 minutes of getting underway. Hot showers, dishwashing, washing hands after a greasy repair job at anchor. All luxuries that became automatic, no generator or shore power required.
I replaced the water heater after 8-9 years. I never even bothered to see where it was leaking, just dropped in a new one as soon as I saw water under it. If you got 14 years out of yours, it owes you nothing.
One time, a support holding the engine coolant loop hoses failed and one chafed on the steering components, causing an engine coolant leak. A quick patch underway, and a more permanent fix dockside, solved that problem.
Despite those two episodes, having hot water for 10 years was worth it.