Author Topic: Water heater plumbing to Westerbeke 40?  (Read 132 times)

Sailing_Photog

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Water heater plumbing to Westerbeke 40?
« on: April 10, 2018, 11:03:40 PM »
I took out the non-functioning and rusting Paloma propane on-demand water heater in my P365 and have installed a new Isotemp water heater.  (The propane water heater scared the crap out of me the last time it poofed in a mini explosion while trying to light it, and I'm glad it's gone.)

Now my question:  how do I plumb the water heater to the Westerbeke 40?  I have the engine cooling system's expansion tank up under my starboard lazarette lid.  The water heater is above the engine but below the expansion tank.  I've seen mention of having to run a line to the expansion tank and not directly to the engine?  I really have no clue how to hook into my antifreeze/fresh cooling system and get flow through the heater.  Photos and clear explanations appreciated! Really want to use that shower....

ZULU40

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Re: Water heater plumbing to Westerbeke 40?
« Reply #1 on: April 14, 2018, 04:43:10 PM »
to be clear I have no idea either, but it sounds like a heat exchanger within a heat exchanger

my own heater is both 240v on shore and 12v off shore
and its plumbing is well, complicated
FWIW a illustration is below

Further South than South is
Hull #103

P69

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Re: Water heater plumbing to Westerbeke 40?
« Reply #2 on: April 14, 2018, 09:20:01 PM »
Here are some threads. A couple are for Universal engine, the others are for westerbeke (?)

The first has a pdf attached for a westerbeke service bulletin that addresses water heater plumbing.

http://www.pearson365.com/forum/index.php?topic=749.0
http://www.pearson365.com/forum/index.php?topic=1570
http://www.pearson365.com/forum/index.php?topic=31
http://www.pearson365.com/forum/index.php?topic=1430


ZULU40

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Re: Water heater plumbing to Westerbeke 40?
« Reply #3 on: April 15, 2018, 03:20:21 AM »
ah, sorry for the distraction
Further South than South is
Hull #103

Sailing_Photog

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Re: Water heater plumbing to Westerbeke 40?
« Reply #4 on: April 16, 2018, 12:38:07 AM »
Thanks P69.  I had found most of those threads but was hoping for photos showing clearly which port is which on the thermostat area and what hose on the remote filler/expansion tank I should tap into.  Seems like all the engine info online I can find uses bad photocopies of screen printed manuals and you can't really see details.

I've been advised NOT to plumb the water heater in series, as the service bulletin 95 says to do. 


P69

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Re: Water heater plumbing to Westerbeke 40?
« Reply #5 on: April 16, 2018, 10:12:56 PM »
Sorry, can't help you with pictures, I don't have a westerbeke. 

Maybe someone will come a long right quick and post some pictures of their setup.
Until then, perhaps these will lead you to what you need.

http://www.cruisersforum.com/forums/f54/perkins-4-108-water-heater-plumbing-9594.html
https://www.sailangle.com/articles/details/id/11

Rudderly Confused

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Re: Water heater plumbing to Westerbeke 40?
« Reply #6 on: April 21, 2018, 11:42:39 AM »
Hi Sailing Photog,

I've been meaning to reply, and finally got around to taking a few photos.  My 1978 365 came with the setup shown in the pics, but I won't claim it is the "right way". All I can say is it works for me.  I don't have a port on the engine in the thermostat area, I have a T in the hose from the thermostat to the expansion tank.  The small end of the T (5/8") goes to one side of the water heater.  There is a valve between the thermostat and the T, but I have no idea what purpose it serves.  I just left it as it came (open).  The other hose goes from the water heater to a T on a pipe nipple to the water temp alarm sensor.  The pic of the back of the water heater shows the old (red) hoses, before replacement.  Hope this helps.

Chuck
Valhalla
« Last Edit: Today at 08:01:12 PM by Rudderly Confused »

Sailing_Photog

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Re: Water heater plumbing to Westerbeke 40?
« Reply #7 on: April 21, 2018, 09:09:24 PM »
Chuck Rudderly Confused, this is a huge help!   Thanks so much for the clear photos that show where to T into the engine.  I thought it went in near the thermostat from descriptions I had read but it makes more sense at the back of the head. 

I would guess your cutoff valve at the expansion tank is to send all the coolant flow through the water heater?  Personally, I'd think I'd want the opposite: a way to bypass the water heater flow would be a good thing....

Chuck Sailing_Photog
s/v Laura Jack
1979 P365 sloop


Rudderly Confused

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Re: Water heater plumbing to Westerbeke 40?
« Reply #8 on: Today at 07:59:54 PM »
Yeah, I can't quite figure out the use for that valve, and always leave it open.  Seems like if it was closed, it would prevent circulation in the closed cooling loop, or force all the coolant through the water heater and it's smaller hoses.  I just added a bypass at the back of the water heater to prevent that.  I was having overheating problems at the end of last season, and one of the service bulletins said a restriction in the water heater could cause that.  The bulletin recommended a bypass, so I'll see how that works out this season.
« Last Edit: Today at 08:04:20 PM by Rudderly Confused »