Bruce, the engine loop inside the water heater is usually copper with no check 
valves so it should not matter how it’s connected, it’s just a loop. You can 
tell which hose is the supply with the engine running, it’s going to be the 
warmest one. The little bit of air inside the loop will be removed by the 
engine in its normal cycle and coolant will be drawn back in from your coolant 
reservoir. The air inside the tank will come out the hot side of a faucet. I 
avoid bleeding air using the pressure temperature relief valve because they are 
notorious for dripping after you do, probably less of a risk at boat pressure 
compared to household pressure. If it does it’s usually made by Watts and they 
aren’t too expensive or hard to replace with a small pipe wrench. You haven’t 
said why you suspect air but if it’s been disconnected a while the engine inlet 
or outlet can become plugged and not circulate. Best way to tell is if you have 
warm water circulating through both hoses with the engine running. 
Len Mitchell
Crazy Legs
1989 37+ 
Midland On. 

Sent from my iPad
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