Marine water heaters fail in predictable ways. The fix is almost always one of three things — and you don't always need to replace the heater.
What to Check
1
Element failure
120V AC element burns out from running dry. Test resistance at the terminals — open = burned out.
2
Thermostat
Failed thermostat won't trigger the element. Cheap and easy to swap.
3
Engine heat exchange loop
Underway hot water comes from the engine cooling loop. A clogged loop or bad check valve breaks this.
4
Internal corrosion / leaks
If the tank is weeping, replace — internal corrosion can't be repaired.
When to Call Us
We carry Isotemp, Raritan, and Whale parts and can rebuild or replace your water heater in a half-day.