Water flow calorifier and Yanmar 3GM30F coolant

[oowee]

Looking for some advice pls. I have a 3GM30F yanmar and just purchased a Quick Nautical Calorifier. This unit has a coolant in and a coolant out connection. I want to connect it the right way around. Which way does the coolant travel around the engine? How can I identify the water in connection?

 

[ChromeDome]

Little sister Yanmar but should be similar:

 

[awol]

It's easy. 1st source connections from eBay or somewhere, the Yanmar kit is extortionate. Connect pipes with enough spare to fit either connection. If the domestic water gets hot, it's the right way round - if not, swap the connections at the easier end.

 

[oowee]

Perfect thankyou.