The temperature of the
stored water heated by a direct-cooled engine is less predictable.
Many engines are designed to run with a relatively high water
temperature in the engine block, while the exhaust is cooled
to a lower temperature. With suitable take-off and re-entry,
an adequate stored water temperature can often be achieved.
Check your engine manual for details, or ask
your engine supplier.
The instruction manual
supplied with C-Warm explains how to adapt the engine cooling
circuit to incorporate the storage heater.
Thermostatic control may not be necessary with
direct cooled engines.
How long will the Engine take
to heat the Water?
About 15 - 20 minutes. Heating time is almost
independant of storage heater capacity. Larger heaters have
longer coils and thus more surface area for heat exchange with
the greater volume of water.
All but the smallest marine engines discharge more than enough
waste heat for satisfactory performance with C-Warm storage
heaters up to the largest standard sizes (136 litres, 30 gallons).
How long will the Water stay
Hot?
Depending on heater volume and on ambient temperature,
the stored water will drop from a nominal 55 deg C to 35 deg
C (still warm enough for a comfortable shower) over a period
of about 12 - 20 hours after the engine has stopped. The larger
the volume of the heater the more slowly the stored water will
cool.
