Hawkeye
Veteran Member
Just replaced my 20 year old Raritan 12 gal. unit that was clearly failing (water not hot, recovery slow.) It also was producing, when water was hot, a short blast of cool water, then hot water when taking a on/off/on navy shower. What is troubling is that the new water heater does the same thing. How does cool water momentarily get into the water lines after the lines are full of warm water? It is just a momentary blast of cold water (after hot) when the valves haven't been touched. I can't figure it out but it happens the same in all the boat's sink's as well. Nice warm water, then a second of cold water then back to warm. No air in the lines, no faulty water delivery throughout the boat except this, both before and after replacing the water heater. Any thoughts would be appreciated.