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Air cooling Air-cooling is a traditional way of removing heat with a condenser
where air is blown through by a fan. It is important that the compressor
compartment is ventilated, so that cold air enters from below and hot
air is allowed to escape above. The lower in the boat the compressor
is installed the more "help" it gets from the outside water. Self-pumping seawater cooled
This means that refrigeration efficiency is completely independent of the air temperature inside the boat. Even on the hottest days of summer - just when a refrigerator is needed most - the water-cooled Isotherm SP operates consistently at an extremely high level of efficiency impervious to hot ambient temperatures. Without fans or pumps to remove the heat generated by the refrigeration compressor, the SP system consumes much less battery power and is remarkably quiet. Although heat always rises if left to the laws of nature, the Isotherm SP unit uses the natural movement of the hull to draw heat down and out through a special fitting in the galley sink drain hose.
Isotherm Magnum - Electric pump seawater cooled
An internal light kit is available (Part No. SEC 00003 DA).
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Cooling
- to remove heat from the food
The
Isotherm SP system is a totally new technique that is cooled directly
by the surrounding water. 
As
this hose is not restricted by pumps or non-return valves, the flow
inside is completely free. Each movement of the water surrounding the
boat produces a similar change of the water level inside the hose resulting
in the pumping of a similar quantity of water in and out through the
hull fitting. By designing a special hull fitting containing a non-restricting,
full-flow spiral heat exchanger for cooling the heated refrigeration
agent, an extremely efficient cooling system is created. As the hull
fitting is always situated some distance from the boat's centre of gravity,
even the smallest movement of the hull or mast of a sailing boat is
sufficient to create a pumping action. This movement by which warm water
is continuously pumped out and cold water in, also prevents fouling.
The through-hull fitting is made of saltwater resistant brass and the
full-flow coil heat exchanger is of copper-nickel alloy. A zinc anode
comes with the kit. The 5 ft. pipe connecting it to the compressor and
the 8-9.75 ft. pipe from the holding plate are both pre-filled and fitted
with quick-fit connectors. 
All
Magnum models are fitted with integral sea water pumps for circulating
the cooling water through the cooling section of the refrigerator compressor.
The pump is quiet, self-priming, withstands being run dry and is self-aerating.
The highly efficient heat exchanger is manufactured in a corrosion-resistant
copper-nickel alloy and fitted with a zinc anode. Sea water systems
are unmatched in efficiency and offer increased cooling capacity.