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calorifier

1K views 6 replies 5 participants last post by  cas206 
#1 ·
G'day... Bought a new stones boat calorifier off ebay for $99, unseen and unheard of until impulse buy (trying to get hotwater showers sorted for missus) and discovered that it reticulates water. Is there any way to hook up to existing marinised yanmar? Posting from android ph, will post link to stones when home.
 
#2 ·
To most of the rest of the world a calorifier is a HW heater. ;)

If the engine is FWC it should be possible to simply plumb it into the cooling system. RWC engines don't generally lend themselves to this kind of installation.

Yanmar should have drawings for doing this.
 
#4 ·
RWC = raw water cooled; water is drawn from outside the boat and circulated through the engine block and head to cool it, then discharged (usually via the exhaust). It's basically an open cooling system.

FWC = freshwater cooled; a closed volume of coolant (usually water and glycol) circulates through the engine block and head, and is then cooled via a heat exchanger. The heat exchanger transfers the heat to water drawn from outside the boat, that water is then usually discharged via the exhaust system. So, the water that actually circulates in the engine is in a closed system.

FWC engines tend to have thermostats set to about 180˚F, similar to car and truck engines. RWC engines have thermostats set to about 110˚F to reduce the build up of scale in the engine block (this is particularly problematic in sea water). The lower temps in RWC engines are just too cool to use for heating domestic water.
 
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