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I’m somewhat frustrated by the lack of hot water when cruising. I find my Yanmar engine doesn’t make hot water unless I run the engine under load for at least an hour or two. I could probably idle all day and not get any hot water. I guess they did too good a job with the cooling system. Do any other Yanmar owners have a similar experience?
I’ve probably resigned myself to cold water. We boil water for dishes. This doesn’t help with showers. I’ve considered doing what I did with my old boat, a pump-up garden sprayer filled with warm water. I almost bought a generator a month or so ago, but I decided that I have no convenient place to put one large enough to heat water. Any ideas?
Regards
RichPost generated from Pearson424 Forum using Mail2Forum
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Hi Rich,
There are a couple of reasons you may have that problem, the easiest could be an air bubble in the waterheater circuit. I had that – and because the little vent to the overflow tank in the pressure cap of the engine was plugged, the air never got purged. Once I cleared that, I had hot water galore. True, I have a Westerbeke 58, but you get my drift. The second thing is the the thermostat is opening too soon so there's never a bypass to the heater. If your engine normally runs cold (<180) you may want to up the temperature on the thermostat to 190. Finally, I don't remember how old your engine is, but that dopey little bypass port might be plugged.
I'd check for air first.
Hope that helps,
Bob
On Thu, Sep 17, 2009 at 9:05 AM, < ([email][/email])> wrote:
I'm somewhat frustrated by the lack of hot water when cruising. I find my Yanmar engine doesn't make hot water unless I run the engine under load for at least an hour or two. I could probably idle all day and not get any hot water. I guess they did too good a job with the cooling system. Do any other Yanmar owners have a similar experience?
I've probably resigned myself to cold water. We boil water for dishes. This doesn't help with showers. I've considered doing what I did with my old boat, a pump-up garden sprayer filled with warm water. I almost bought a generator a month or so ago, but I decided that I have no convenient place to put one large enough to heat water. Any ideas?
Regards
Rich—
Bob Fine
s/v Pelican
Hull #8Post generated from Pearson424 Forum using Mail2Forum
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Oh, and the Honda 2000 will, indeed, heat your water in about 20 minutes. You just can't charge your batteries at the same time.
Bob
On Thu, Sep 17, 2009 at 9:05 AM, < ([email][/email])> wrote:
I'm somewhat frustrated by the lack of hot water when cruising. I find my Yanmar engine doesn't make hot water unless I run the engine under load for at least an hour or two. I could probably idle all day and not get any hot water. I guess they did too good a job with the cooling system. Do any other Yanmar owners have a similar experience?
I've probably resigned myself to cold water. We boil water for dishes. This doesn't help with showers. I've considered doing what I did with my old boat, a pump-up garden sprayer filled with warm water. I almost bought a generator a month or so ago, but I decided that I have no convenient place to put one large enough to heat water. Any ideas?
Regards
Rich—
Bob Fine
s/v Pelican
Hull #8Post generated from Pearson424 Forum using Mail2Forum
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Rich,
I was going to say my Yanmar produces scalding hot water, but then I thought and realized I rarely use the engine for that purpose. So most of that scalding water was produced while running the engine under load for an hour or more. I use my generator to charge batteries and run the fridge when at anchor and it powers the electric water heater. However, I did use the engine for those purposes at idle speed much of last winter when my generator was out of commission and I don't remember having a problem making hot, if not scalding, water. I'm sure I would have noticed if the water was just luke warm. I normally ran the engine for about 1 hour twice a day during the periods.
I suspect there is a problem somewhere in the delivery of coolant from the engine through the tank. I seem to remember that you put in a much larger tank than the standard 6 gal Raritan that I have. That might account for part of the longer time it takes to heat the tank, but I wouldn't think it would be as significant as you report.On Thu, Sep 17, 2009 at 9:05 AM, < ([email][/email])> wrote:
I'm somewhat frustrated by the lack of hot water when cruising. I find my Yanmar engine doesn't make hot water unless I run the engine under load for at least an hour or two. I could probably idle all day and not get any hot water. I guess they did too good a job with the cooling system. Do any other Yanmar owners have a similar experience?
I've probably resigned myself to cold water. We boil water for dishes. This doesn't help with showers. I've considered doing what I did with my old boat, a pump-up garden sprayer filled with warm water. I almost bought a generator a month or so ago, but I decided that I have no convenient place to put one large enough to heat water. Any ideas?
Regards
Rich—
Regards,
John Stevenson
http://www.svsarah.comPost generated from Pearson424 Forum using Mail2Forum
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Rich,
I have a fairly new Yanmar 4JH4E and it makes scalding hot water in minutes. I’ve been concerned that it’s too hot for the system, but so far no problems there. I suspect the problem is not your engine, but your heat transfer system and/or water heater. I’m not enough of a mechanic to offer specific remedies, though.
I virtually never run my engine these days except for propulsion. Instead, I use the Honda EU2000i generator for daily battery/fridge charging, and it’ll make shower-hot water if I turn on the water heater for 10 to 20 minutes (depending on ambient temperature), albeit nowhere near as hot as the engine-heated water.
Tor
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Silver Heels, P-424 #17
http://www.SilverHeels.us
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Original Message
<.. snip>Post generated from Pearson424 Forum using Mail2Forum
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Hi Rich,
As you probably know, I have a yanmar now also. It produces hot water in direct correllation to the rise in engine temperature..so around 20 minutes for my 6 gal Raritan to equalize to the engine running temp.
I don’t know why you would not get the same results unless you have a blockage or an air lock in the circulation hoses. Of course you must have the recirculation valve open..LOL! I’m sure you do, right?Joe,
s/v Half Moon<.. snip>
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Several months ago I posted a problem I was having relating to heating domestic hot water with the engine. My engine would get hot but I could only get sufficient domestic hot water if the engine had been running for a long time.
I have a 10 year old Westerbeke 63C which I don't think too many other Pearson owners have. I eliminated an air lock as the source of my problem. I replaced the existing Raritan 6 gallon water heater with a new Super Stor 6 gallon water heater thinking that there was poor heat transfer inside the waterheater. When I removed and looked inside the old water heater there was a considerable layer of deposits on the exchanger. However, even with the new water heater, there was still inadequate hot water production. I could feel that the hose going to the water heater did not get hot in relation to the engine temperature.
I took my entire engine cooling system apart to confirm that the heat exchanger was allowing flow from the water heater, replaced all the hoses (to eliminate internal collapsing of hoses), cleaned the thermostat housing/replaced the thermostat, and examined the vanes on the engine coolant pump. All systems were normal.
I called Engines 1, the regional Westerbeke folks, and didn't get much help other than to get a couple of local mechanics who they recommended. I called one of the mechanics who didn't have any specific experience with this engine. I described the flow of coolant thru the engine and water heater. The hot water heater is a circuit off the manifold thru the hot water heat and then back to the heat exchanger. He stated that the flow I described was a poor design (too passive) and will be inadequate to provide hot water. He stated that I needed to get my outflow to the water heater back at the coolant pump where it would have more pressure to force it thru the water heater. There was no way to do that. So, I added a small 12v Jabsco circulation pump at the water heater that gets turned on manually when I turn the engine on. I can leave this pump on after the engine is off and continue to suck heat off the engine and into the water heater as long as the engine is hot. This action greatly improved my hot water production.
Rick
EclipseOn Thu, Sep 17, 2009 at 9:05 AM, < ([email][/email])> wrote:
I'm somewhat frustrated by the lack of hot water when cruising. I find my Yanmar engine doesn't make hot water unless I run the engine under load for at least an hour or two. I could probably idle all day and not get any hot water. I guess they did too good a job with the cooling system. Do any other Yanmar owners have a similar experience?
I've probably resigned myself to cold water. We boil water for dishes. This doesn't help with showers. I've considered doing what I did with my old boat, a pump-up garden sprayer filled with warm water. I almost bought a generator a month or so ago, but I decided that I have no convenient place to put one large enough to heat water. Any ideas?
Regards
RichPost generated from Pearson424 Forum using Mail2Forum
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John
Yes, I have an 11 gal tank instead of the 6gal. I like the extra capacity and the Force-10 water heater keeps water hot for over 24 hours. I get plenty of hot water after running the engine hard for a while. I don’t know how long it takes. I’ve never timed it. I know that running it at idle for a couple of hours doesn’t even warm the water, so I don’t think its a water capacity issue. I don’t think hot coolant gets to the heat exchanger when idling. The engine thermostat even reads about 190 deg when idling. It reads about 195 when under load.Rich
Original Message
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The thermostat is probably stuck open. It can be tested in a pot of water on the stove. The previous unit I had, included a little bead on a chain that was set into the dish assembly, no idea what is was for. In November of last year I was unable to get the boat to operating temp. I ran it for nearly 4 hours and it only came up to 140. The following weekend I pulled the t-stat and found the chain and ball do-hickey wedging the unit wide open. OR, it could be in upside down.
I replaced it with a NAPA 180 degree unit and have hot water within minutes.
On Thu, Sep 17, 2009 at 9:05 AM, < ([email][/email])> wrote:
I'm somewhat frustrated by the lack of hot water when cruising.
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Bob,
FYI, I am able to charge my batteries and run the water heater simultaneously, probably because I have a wimpy little 20A battery charger. A 40A replacement charger is on The List, but not at the top.
Tor
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Silver Heels, P-424 #17
http://www.SilverHeels.us
~~~~~~~~~~~~~~~~~~Quote:
Original Message
<.. snip>Post generated from Pearson424 Forum using Mail2Forum
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Hmmmm…mine has a valve on the fitting that has the hose going TO the water heater. It’s a little valve, around 1/2″ in length, quite visible, and handy if for any reason you would not want coolant going to the water heater. But it was an option that I had to order when I bought the engine.
Does your hose get hot when the engine is running at operating temp.?Joe,
<.. snip>
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Joe and Rick,
Is the valve you have similar to the one cited in the Raritan manual attached? That is, a valve to regulate the amount of coolant that goes to the heat exchanger in the hot water tank?On Thu, Sep 17, 2009 at 6:32 PM, Joseph Steiner < ([email][/email])> wrote:
Quote:Hmmmm…mine has a valve on the fitting that has the hose going TO the water heater. It's a little valve, around 1/2″ in length, quite visible, and handy if for any reason you would not want coolant going to the water heater. But it was an option that I had to order when I bought the engine.
Does your hose get hot when the engine is running at operating temp.?
Joe,<.. snip>
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No….the valve is on the Yanmar engine….on the coolant exit pipe where the hose to the water heater is attached.
<.. snip>
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Joe,
Whether it is connected to the engine pipe or a hose connected to that pipe, isn't this functionally what you have – a diverter valve that controls the amount of coolant going to the water tank heat exchanger?On Thu, Sep 17, 2009 at 10:27 PM, Joseph Steiner < ([email][/email])> wrote:
Quote:No….the valve is on the Yanmar engine….on the coolant exit pipe where the hose to the water heater is attached.<.. snip>
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Yes, functionally. I thought you were asking if the valve was designed and spatially located as in the diagram you attached. But yes, you could regulate the trhoughput. I use it functionally as a safety device should I ever develop a leak in the water heater circuit.
<.. snip>
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No diverter valve on my 63C
RickOn Thu, Sep 17, 2009 at 6:54 PM, John Stevenson < ([email][/email])> wrote:
Quote:Joe and Rick,
Is the valve you have similar to the one cited in the Raritan manual attached? That is, a valve to regulate the amount of coolant that goes to the heat exchanger in the hot water tank?On Thu, Sep 17, 2009 at 6:32 PM, Joseph Steiner < ([email][/email])> wrote:
Quote:Hmmmm…mine has a valve on the fitting that has the hose going TO the water heater. It's a little valve, around 1/2″ in length, quite visible, and handy if for any reason you would not want coolant going to the water heater. But it was an option that I had to order when I bought the engine.
Does your hose get hot when the engine is running at operating temp.?
Joe,<.. snip>
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