raw water through calorifier or not?

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I'm not even sure that it's necessary to have an all-stainless calorifier, especially as a lot of the cooling pipes on Volvo engines are copper.

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Quite correct. For example, the copper calorifier has been in my boat for the last 24 years and is perfect, despite being 'thrashed' when we cruised full time for almost ten years.

We have never had and build-up of 'sludge' or any other nasty in all that time., just enjoyed very hot water and loads of it. /forums/images/graemlins/smile.gif /forums/images/graemlins/smile.gif
 
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We have a 2GM20 with raw water cooling which feeds a small hot water tank ... no, it isn't steaming hot, but it is hot enough to do the washing up etc ...
It doesn't require an electric pump or any other weird and wonderful approach to getting the water around the circuit ... I'd take Snowlepoards drawing if I were u ... and try that ... if it doesn't work you can always add freshwater cooling later...
 
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"There is no electric pump designed for this use - at least none that I can find. The one usually recommended by dealers says not for salt water use on its blurb. "

The one recommended and supplied by Bukh is a pump with a ceramic impellor with a magnet attached, driven by another magnet outside the pump housing. This is for use with salt water and has given trouble free service. Only trouble is it is so quiet you need to feel for vibration when its running.

Not cheap it was about £80.

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have you got any details? Cant find anything on the Bukh site.
 
Tried google but seemed to only get very specialised web sites.

If you give Bukh UK a call, 01202 668840, they will be able to help.
 
The pump that was installed by Sadler for all their calorifier installations in seawater service is the Johnson C010P5-1, 12 Volt, 16mm ports, part number 10-35159-3 from Aquafax or T. Norris.

This is described as being for fresh water use but the first one in my boat lasted about 12 years before succumbing to rust. The second one was about 6 years old when I took it out when the engine was changed. It was still running fine then.
 
What other calorifiers are compatible with raw water cooled motors ?

Hi Guys,

just wondering what other calorifiers are suitable for use with raw water cooled motors. And what would be the expected lifespan of the clarifier. One supplier has suggested that I put an anode inline (with the hot water in from the motor) to give the calorifier an extended life. I would appreciate some input who has owned one of these water heaters.

Regards
 
fireball said:
We have a 2GM20 with raw water cooling which feeds a small hot water tank ... no, it isn't steaming hot, but it is hot enough to do the washing up etc ...
It doesn't require an electric pump or any other weird and wonderful approach to getting the water around the circuit ... I'd take Snowlepoards drawing if I were u ... and try that ... if it doesn't work you can always add freshwater cooling later...
Click to expand...

Where does the calorifier get its feed and where does it return to?
 
Re: What other calorifiers are compatible with raw water cooled motors ?

Australiandad said:
Hi Guys,

just wondering what other calorifiers are suitable for use with raw water cooled motors. And what would be the expected lifespan of the clarifier. One supplier has suggested that I put an anode inline (with the hot water in from the motor) to give the calorifier an extended life. I would appreciate some input who has owned one of these water heaters.

Regards
Click to expand...

I'm not sure whether my website existed when this thread was started some nine years ago but there is now a page on calorifiers on it. https://coxengineering.sharepoint.com/Pages/Calorifier.aspx It particularly covers calorifiers with raw-water cooled engines. I know of plenty of copper and stainless steel coils and very few have problems. In fact the one I know quite well that did have severe coil corrosion problems was on an indirectly cooled engine. When I cut open my copper coiled one after around 15 years in service with seawater cooling there was no corrosion at all. I cannot picture an anode on a coil that would be any help at all.
 
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