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Old 07-27-2015, 04:16 PM   #1
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Hot water from engine

Wife complaining about shower water not hot enough while motoring. Usually the water is quite warm after 20 minutes. Considering the stb fresh water pump that's plumbed to the HWH however we have no increase in engine temp and it was replaced in 2009. Also no leakage or loss of coolant.
Any other ideas?
Thanks, Loon in the San Juans
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Old 07-27-2015, 04:21 PM   #2
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Blocked heat exchanger in hot water tank?

Any valves inadvertently turned off?
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Old 07-27-2015, 04:30 PM   #3
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Thermostat locked open? How hard are you running the engine? What does your engine temp gauge say?
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Old 07-27-2015, 04:33 PM   #4
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Quote:
Originally Posted by Loon View Post
Wife complaining about shower water not hot enough while motoring. Usually the water is quite warm after 20 minutes. Considering the stb fresh water pump that's plumbed to the HWH however we have no increase in engine temp and it was replaced in 2009. Also no leakage or loss of coolant.
Any other ideas?
Thanks, Loon in the San Juans
Loon
Your post appears twice in two different topic areas, maybe a site Guru could combine them into one topic for you.
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Quote:
Originally Posted by Loon
Loon here. Cruising the San Juans and have a question. We developed a noise at 1500 rpms which went away at a lower rpm. A wife complained of lukewarm water while showering. I'm positing the fresh water pump is the culprit however no leakage. It is the 6.354M starboard engine,

-------------------------------------------
The impeller is metal and seldom fails, it's usually bearings that doom the pump. if the engine isn't running hot, fluid levels are normal and no leakage from the bearings....My guess would be it's something else.

I only had this happen once with my old hot water tank. Turned out to be a build up of "crud" at the engine hose bibs (where the heater hose from the tank connects to the engine) restricting the coolant flow to/from the water tank. Cleaned it out with a screw driver and battery brush. If you're at a dock where you can take the hoses loose and catch the coolant, you can check that out pretty easy.


PS: Also try blowing through the hose end to make sure there isn't a restriction in the water tanks heat exchanger.

The noise could be another issue that you might want to trouble shoot right away as well.
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Old 07-27-2015, 06:42 PM   #5
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Just after we anchor up our water is too hot to do anything with. Only a 40hp engine heating it too.
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Old 07-27-2015, 07:16 PM   #6
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You got something wrong. HWH's that get exchange heat from engines make seriously hot water pretty damn fast. You got something going on there.

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Old 07-27-2015, 07:25 PM   #7
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Can you 'touch' the hoses going to and from the HWH? Are they warm? If they are hot then you may have scale in the HWH tank. Do you have a mixing valve in the system? Have you gone down and opened the valve ON the HWH?

Are there any other hot water valves that you can use that are NOT fed by the one your wife is using? Like an aft deck shower?

And as others asked, Is the engine water temperature at the normal temp?
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Old 07-27-2015, 07:30 PM   #8
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Just an FYI...if HWH stands for "hot water heater", please refer to it as a water heater. If the water was already hot, then why would you need to heat it???....okay, as you were!!!!...
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Old 07-27-2015, 08:20 PM   #9
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Some POs have installed mixing valves to keep unsuspecting guest from getting scalded. Trace the plumbing.
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Old 07-27-2015, 08:32 PM   #10
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@Baker: I'll tell that to my wife next time were shut down and she wants a hot shower from the hot water tank. With the engine off!!😢
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Old 07-27-2015, 09:52 PM   #11
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I think that 'hot water tank' is OK, just not 'hot water heater'.
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Old 07-27-2015, 11:07 PM   #12
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I think that 'hot water tank' is OK, just not 'hot water heater'.
On my boat the tank is used as both, a hot water tank when the engine is running, and a hot water heater when the gen is on, or on shore power. Same tank, two uses. I was just jumping on the generic term.


Speaking of hot water heaters, plumbed up to the engine cooling loop, has anyone ever lost a water heater (and the engine cooling water?) I was contemplating putting in a couple valves and a jumper valve to shut off that loop. Wondering how long water heater tanks last????
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Old 07-27-2015, 11:30 PM   #13
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I was contemplating putting in a couple valves and a jumper valve to shut off that loop. Wondering how long water heater tanks last????
It happens so rarely, its better to keep it simple: If you loose the hot water tank heat exchanger or split a heater hose, it's an easy fix to reconnect the good heater hose from the tank back to the inlet side on the engine to form a loop.

My last tank lasted 20+ years on this boat before the bottom rusted through. I have never lost the tank heat exchanger side of the circuit.
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Old 07-27-2015, 11:37 PM   #14
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There should be a shutoff where the hose is connected to the engine cooling system.
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Old 07-27-2015, 11:58 PM   #15
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Quote:
Originally Posted by Baker View Post
Just an FYI...if HWH stands for "hot water heater", please refer to it as a water heater. If the water was already hot, then why would you need to heat it???....okay, as you were!!!!...
Baker your so wrong your right
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Old 07-28-2015, 12:04 AM   #16
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Originally Posted by siestakey View Post
Baker your so wrong your right
Now that`s fixed, we can work on pronouncing "pedant". Most people say "ped-ant, but "P`Dant" is an option.
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Old 07-28-2015, 01:42 AM   #17
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Water heat

Loon here, Thanks everyone, I think I have enough advice to last the weekend.
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Old 07-28-2015, 02:01 AM   #18
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oh ok, I should read all the posts. Disregard.
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Old 07-28-2015, 07:08 AM   #19
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Loon, FWIW, when I had a similar issue, I found disconnecting the recirc hoses or pipes from the engine hose outlets that run to and through the hot water cylinder and giving them a good flush through from a hose flushed out a lot of built up crud, and then all worked well again.
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Old 07-28-2015, 07:23 AM   #20
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Forgot earlier...many tanks come with or had a mixing valve installed at some point.

May have to remove or figure out how to test it in place.
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