I inherited a new Model S600 water heater. The instructions show the unit connecting directly to the engine water system as a closed loop system. The implication is that the heat exchanger resident in the heater for heating the water will somehow cool the engine. This seems pretty much impossible to me because no raw water is used to carry off the excess heat. I've called the manufacturer and I am hoping they get back to me this year. Until then has anyone had experience with this heater/heat exchanger? Am I missing something regarding thermal dynamics? Any help would be appreciated. Thanks - Joe M.
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W
Walt
Its a cold water heater
the purpose of the heat exchanger in your cold water heater is to supply you with hot water while under way on the engine or if you run your engine while at anchor. the basic purpose is to heat the water and not cool the engine. any cooling effect on the engine is a side benefit.
the purpose of the heat exchanger in your cold water heater is to supply you with hot water while under way on the engine or if you run your engine while at anchor. the basic purpose is to heat the water and not cool the engine. any cooling effect on the engine is a side benefit.
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Bryan C.
Engine is cooled via sea water
Whether directly or thru an exchanger with a fresh water cooling system like you have
Whether directly or thru an exchanger with a fresh water cooling system like you have
R
Roland
Water Heater
Joe, if you have the older Yanmar 12hp that was original with the boat, assuming of course that your h30 is pre '83 vintage, than you cannot attach the water heater to the engine because it is raw water cooled only. Therefore, there is no engine heat exchanger. You can only heat water through your 110V system. If I am wrong about this, I hope someone explains it to me so when the time comes to replace my 24 year old heater I do it right. -Roland S/V Fraulein II
Joe, if you have the older Yanmar 12hp that was original with the boat, assuming of course that your h30 is pre '83 vintage, than you cannot attach the water heater to the engine because it is raw water cooled only. Therefore, there is no engine heat exchanger. You can only heat water through your 110V system. If I am wrong about this, I hope someone explains it to me so when the time comes to replace my 24 year old heater I do it right. -Roland S/V Fraulein II
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Joe M
Got the Answer
Seaward, has in fact answered my question quickly. i don't know much about Seaward but they just got some points for a quick response. The input to the heat exchanger is from the hot side of the engine through the heat exchanger to the riser. This makes sense to me! What they did not specify in the instructions was this is an alternative to a fresh water coolin system. Roland - the only issue is that you must flush the system every 6 months with fresh water to eliminate salt build up which will do a job on the aluminum exchanger. (no problem up north) Thanks to everyone for the help. Joe M.
Seaward, has in fact answered my question quickly. i don't know much about Seaward but they just got some points for a quick response. The input to the heat exchanger is from the hot side of the engine through the heat exchanger to the riser. This makes sense to me! What they did not specify in the instructions was this is an alternative to a fresh water coolin system. Roland - the only issue is that you must flush the system every 6 months with fresh water to eliminate salt build up which will do a job on the aluminum exchanger. (no problem up north) Thanks to everyone for the help. Joe M.
Not sure that the exchanger will work!
Joe: I am not sure that the raw water from the engine is going to ever produce enough heat to heat up the water. Only time will tell. Did you old heater have a heater from the raw water side? If not you may want to check with owners that have a similar engine and setup as you have. Then next question is how are you going to get the heater into the lazarette? Good luck!
Joe: I am not sure that the raw water from the engine is going to ever produce enough heat to heat up the water. Only time will tell. Did you old heater have a heater from the raw water side? If not you may want to check with owners that have a similar engine and setup as you have. Then next question is how are you going to get the heater into the lazarette? Good luck!
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Garry @ S/V TASHTEGO
Hot water
The cooling water output will surely heat a hot water heater as it should be at the thermostat temperature, 160 to 180 degrees F which is a lot hotter than home hot water at around 120 degrees F or less. In fact, unless there is a thermostatically operated bypass in the water heater, the hot water may get too hot for you. If you have a raw water cooled engine use the engine output water. For a FWC engine use the coolant from the same place and run it through the hot water heater BEFORE going to the heat exchanger in the cooling system. The hot water heater is not a substitute for fresh water cooling. Once the water in the hot water heater is hot it will no longer have any effect on the engine temperature. Do not confuse the heat exchanger in the hot water heater for the heat exchanger in the cooling system. A FWC engine needs the latter whether or not a water heater is installed.
The cooling water output will surely heat a hot water heater as it should be at the thermostat temperature, 160 to 180 degrees F which is a lot hotter than home hot water at around 120 degrees F or less. In fact, unless there is a thermostatically operated bypass in the water heater, the hot water may get too hot for you. If you have a raw water cooled engine use the engine output water. For a FWC engine use the coolant from the same place and run it through the hot water heater BEFORE going to the heat exchanger in the cooling system. The hot water heater is not a substitute for fresh water cooling. Once the water in the hot water heater is hot it will no longer have any effect on the engine temperature. Do not confuse the heat exchanger in the hot water heater for the heat exchanger in the cooling system. A FWC engine needs the latter whether or not a water heater is installed.
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