86 mercruiser 5.7 and coolant hoses going to the hot water heater??

[lime4x4]

Is this how it's done? Started to remove the engine for some repairs and i noticed that someone tied in the engine coolant system into the hot water heater.It's a raw cooled engine by the way

 

[Don S]

Re: 86 mercruiser 5.7 and coolant hoses going to the hot water heater??

Yep, that's how it's done. Then the engine heated water goes thru a heat exchanger in the HWH and heats the water while the engine is running.