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Old 04-24-2016, 07:56 PM
hankster2 hankster2 is offline
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Boat: 1988 Prostar 190
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Automatic Temperature Shower Install - Cheap and Easy

I just installed a shower on my boat and wanted to share a couple pieces in case anyone is is inclined to do the same.

The previous owner of the 1987 Prostar 190 had installed a shower straight off one of the drain petcock locations on the block. As a result the only temperature available was scalding.

I decided to integrate a thermostatic mixing valve ($35 on Amazon Prime) so I could set the shower temperature I wanted and forget it. For those unfamiliar, this little device takes hot and cold water inputs and mixes via the same principles as an engine thermostat and delivers a consistent water temperature output - which can be set via a knob on top (no wires... all mechanical). They're often used in sinks and showers to set the max fixture output temp to prevent scalding (like when a hot water heater is set too high or when someone flushes a toilet while you're in the shower).

Thermostatic Mixing Valve

The other thing (in case anyone is in my same situation) is I've found "Dorman 627-006 Radiator Hose Connector" ($10 Amazon Prime) is perfect for Tee-ing in the cold water between the raw water pump and engine water pump. The output can be stepped from 3/4" heater hose immediately down to something smaller like 3/8" or 1/2" if you want an easier to run diameter.

Dorman Tee

Today was our first day out with the new setup and it was great. I'll add any relevant updates.
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  #2  
Old 04-24-2016, 08:03 PM
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tommy panfish tommy panfish is offline
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Boat: 1996 pro star
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Quick question....do you have a pump? Or do you use pressure from motor? Been thinking about adding this....can post some pics.
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  #3  
Old 04-24-2016, 08:06 PM
lees23 lees23 is online now
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Where do you get pressurized cold water to mix with the hot?
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  #4  
Old 04-24-2016, 08:13 PM
uplander uplander is offline
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got any photos
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  #5  
Old 04-24-2016, 10:57 PM
hankster2 hankster2 is offline
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Boat: 1988 Prostar 190
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I'll try to take some pics next time I'm out.

No. No pumps. I just tapped the cold water between the raw and engine water pumps with the tee I linked to. Water pressure is fine if I rev then engine to around 15-1800 rpm. I bought a pressure controlled pump off of amazon for $20 and may experiment with it to see if it let's me drop the engine RPM a little (phase II), but so far rev'ing the engine for a minute or so when a skier get's in/out doesn't seem like much of an issue.

My main purpose was to point out some great, cheap, and universally available items that can be used to put together a nice system that's actually better than a lot of the kits. I almost bought the tee off of a well known supplier site for $40 before I took a gamble on the Dorman. It works perfectly for 25% the price. Also I'd have frozen this weekend because the supplier part wouldn't have arrived in time for me to install it for the weekend.

I had a few small bits lying around and the hot water line was already run, but I probably have around $75 in my shower which is way better than a lot of the kits (and better IMHO because you don't have to mess with mixer valves to get the temperature right). I'm happy to help out with any other opinions/questions.
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  #6  
Old 08-04-2017, 04:00 PM
Master-My-Craft Master-My-Craft is offline
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I tried adding this with the mixing valve and there we no water pressure. If I revved the engine it didn't help the pressure either. I took the cold off of the cold water going to the prop shaft. I figure that if I'm using the shower the prop isn't turning. Put it all together and tried it in the driveway and it would build up pressure but only for a second or two.


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  #7  
Old 08-04-2017, 04:16 PM
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dt37803 dt37803 is offline
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This is why I used a pump. I do not have to have the motor running. My cold pick up is after the raw water strainer before the raw water pump. Hot comes off one of the block drain plugs.
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Old 08-04-2017, 04:18 PM
Master-My-Craft Master-My-Craft is offline
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What pump did you use?


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  #9  
Old 08-04-2017, 04:27 PM
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SS LS1 SS LS1 is offline
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Our 30th Anniversary ProStar had a factory shower system with manual mixing valves right in the rear storage locker area for temp control however there was no flow/pressure without the electric pump being turned on. Of course there likely would not be as the plumbing went through the pump but I can't imagine much flow if it was plumbed around the pump or no pump at all.

The pumps used are simple RV 12v pump kits found at farm stores, larger hardware stores or RV and camping stores.
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SOLD - 1998 30th Anniversary ProStar 190

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  #10  
Old 08-04-2017, 09:34 PM
Master-My-Craft Master-My-Craft is offline
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Do I need to pumps then? One for the hot and one for the cold?


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