Small diesel engines under light load have less “waste” heat than a similar HP gas engine. A diesel engine also wants to be 170F to 180F to run well.
Pulling waste heat off to heat domestic water when motoring for a short time or under light load (calm conditions, under hull speed) may increase the time needed to reach full operating temp. My Dodge pickup with a Cummins 5.9 liter 6 cylinder diesel, driven “sporty” can take up to 15 minutes to hit full operating temp with an ambient outside temp of 70F. If the average outside temp is below 50F I block off ½ of the radiator to reduce the time to reach operating temp. How cold is your raw water? I bet the guys in the Great Lakes are still seeing lake water temps <50F. Calypso’s Perkins 4-108 motoring near hull speed in calm conditions (50F raw water) will make 4 gallons of water hot enough to need mixing in approx. 30 minutes. Martin Calypso 1971 C&C 43 Seattle [Description: cid:D1BF9853-22F7-47FB-86F2-4115CE0BAF2F] From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Joel Aronson via CnC-List Sent: Tuesday, July 08, 2014 1:45 PM To: cnc-list@cnc-list.com Subject: Stus-List Hot Water heater question All, I've got a Raritan heater. When I run my Yanmar 30GM the hot water out of the tap is certainly cooler than I would get from my home water heater. When used to make instant coffee the coffee can be drunk right away without cooling. How hot should the water get? Do I need to flush the water heater? -- Joel 301 541 8551
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