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post #11 of 17 Old 06-26-2016 Thread Starter
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Re: Engine heat water heater

And another good idea. When I go look at her again, I need to check that.
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post #12 of 17 Old 06-26-2016
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Re: Engine heat water heater

15-20 minutes is probably not enough to warm up the whole (cold)water tank. Was the 'not warm enough' hose on the supply or return side of the heater?

A low coolant level (and recent refill) is another clue that you might have had an airlock/block that would have eventually worked itself out given time.

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post #13 of 17 Old 06-26-2016
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Re: Engine heat water heater

Parallel plumbing circuits off the water pump same as a car engine .thermostat opens to the heatEx when hot ..tank gets its water from below thermostat so heats quick A solenoid valve (normal closed ) and controlled by a strap on temp switch from an electric house type tank keeps water from getting scalding hot .(powers off key circuit)
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post #14 of 17 Old 06-26-2016
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Re: Engine heat water heater

On my Perkins 4108 with a 6 gallon water heater tank it was an easy 45 minutes to an hour for hot water to shower in. This in the PNW. Fitting on top of engine for coolant line to run to heater. Never had an airlock issue. Did take an extra 2 liters of coolant though.


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post #15 of 17 Old 06-27-2016
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Re: Engine heat water heater

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Originally Posted by Davenire View Post
While we were motoring out, we checked the water heater.
You're getting good comments so I won't repeat them.

Yanmar 4JH4E and 6 gallon water heater. The engine reaches steady state temperature and the thermostat opens in about 10 minutes. Within 20 minutes the hot water is pretty warm (as in ease back pain warm *grin*). In an hour it is so hot that I have to be careful to leave the electric water heater coils switched off when we plug in at the dock or the thermostat over temperature switch will throw.

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Second, find midget working in yard, he will be the richest worker there, hire him for an hour. Sorry, not PC. Or exploit child labor laws and get a 5 yr old up there
Look for tall skinny guys with long arms. Seriously.

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post #16 of 17 Old 06-27-2016
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Re: Engine heat water heater

Oilstove heated the 10 gal hot water tank all winter but in the spring had to find the reset button for the electric side of the system. Fortunately I'm the tall guy with long arms.
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post #17 of 17 Old 06-27-2016
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Re: Engine heat water heater

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2. There could also be an air lock in the heat exchanger. Bleed the air out of the fresh (engine) water side and see if the temperature raises. There should be a petcock at or near the water heater.
If this was the case, the engine would have seriously overheated.

HXs don't get "air locks" only the freshwater coolant loop, which is used to heat the domestic water, does.

Engine Overheating 101 - How to Burp Your Engine (Reply #6) http://c34.org/bbs/index.php/topic,4....html#msg26462

To the OP, our M25 takes at least a half an hour to heat the water AT CRUISING RPM.

Stu Jackson, Catalina 34, 1986, M25 engine, Rocna 10 (22#), Maple Bay, BC, Canada

Last edited by Stu Jackson; 06-27-2016 at 12:10 PM.
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