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Old 17-02-2020, 07:55   #1
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Perkins 4.108 water heater

Hi, I have been trying to find answers and reading up where I can but so far unable to track down exactly what to do. We currently have no hot water on board. We have 2 Perkins 4.108 engines but both are raw water cooled so no header tanks. We really want to run a calorifier off of one of the engines but cant find information as to how to do this.
Our previous boat had a 4.107 which had a header tank and the calorifier ran from that. We were looking to do the same with this. Does anyone have an idea as to how to go about this please?
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Old 17-02-2020, 08:01   #2
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Re: Perkins 4.108 water heater

Look at “Converting From Raw Water to Fresh Water Cooling” on this forum.
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Old 17-02-2020, 08:16   #3
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Re: Perkins 4.108 water heater

Thank you, will look it up now
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Old 17-02-2020, 15:45   #4
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Re: Perkins 4.108 water heater

You need the hottest water. Usually where the water exits the exhaust manifold. Send that water to the tank and return it to where the the exhaust water you robbed would have gone.
Put in valves in case of leaks.
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Old 18-02-2020, 09:59   #5
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Re: Perkins 4.108 water heater

My 4-108 has hot water outlet and return on either side of thermostat housing.
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Old 18-02-2020, 10:18   #6
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Re: Perkins 4.108 water heater

hot water..... .... the easy way would be instant
demand hot water... aside from tank (s) and other costs... the simplest way to go
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Old 18-02-2020, 21:24   #7
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Re: Perkins 4.108 water heater

Quote:
Originally Posted by arcticmonkey View Post
hot water..... .... the easy way would be instant
demand hot water... aside from tank (s) and other costs... the simplest way to go
Agreed, even a Diesel fired Hydronic system.
The cost would be tolerable if it heats the interior and supplies hot water to the water heater loop.
Other than that, On Demand propane heated hot water is clean and efficient
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Old 26-02-2020, 18:00   #8
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Re: Perkins 4.108 water heater

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Originally Posted by Boatyarddog View Post
Other than that, On Demand propane heated hot water is clean and efficient
And exciting, too!
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Old 26-02-2020, 21:14   #9
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Re: Perkins 4.108 water heater

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Originally Posted by Lepke View Post
And exciting, too!
So, your going to tell me this happened because of a On Demand Water heater?
Or, some other totally avoidable mistake using propane.
Got any better proof than your word?
SV Cloud Duster
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