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Old 01-09-2019, 03:52 PM   #4561
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Matt
Here is a pic of the heat exchanger on my starboard engine for the hot water system. The PEX hoses go to the HWS. The black hose comes out of the front of engine block and returns to the rear of the engine block, a dedicated circuit that is not connected to anything else. No pump in it. Both black hose 3-4 ft. You can see an aquastat on the heat exchanger. That turns on the hydronic coolant circulation pump. The full heating system schematic is in the pdf.

As I mentioned earlier, I can get hot water from Raritan HWS heater element, the Webasto hydronic circuit, or the engine. The schematic shows that I have a 'summer loop'. What this means is that I can run the Webasto to get hot water without heating the whole boat.

Another item on the schematic that I should explain is the auxiliary heater tank. It has a 240V element also. This is used when at the dock on shore power, in winter. It provides about 5-7į of heating for the boat without running the Webasto diesel unit. It was installed to avoid running electric fan heaters when not on board, as they can be a serious fire hazard.

The guys at the PT Shipwright's Co-Op really know their stuff, and my boat's heating system design and installation is first class. Of course now I am Queensland I don't need to heat the boat very often.
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Old 01-10-2019, 03:56 AM   #4562
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Quote:
Originally Posted by Hendo78 View Post
Hi peter.
Thanks for the post. I see your point and will reconsider as suggested. I have a 240vac power point in the engine room. Iíll put a plug on the end of the heating element cable and plug it in but leave it turned off. Can always run down and flick it on like you suggested. Thanks for that.

Do you have any pipework pics of how the engine coolant pipework comes off the engine and into the hot water system? All of my engine hoses are rather big in comparison to the inlet on the system.
Matt, I can't find any shot of my engine that shows the in and out of the coolant supply as it runs through the hot water heat exchanger. However, from memory there was a 12mm (approx) hose outlet set into the larger diameter water hoses roughly either side of the coolant header tank. Something like that would definitely work, just pressurised from the water pump.
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Old 01-10-2019, 04:55 AM   #4563
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My Webasto hydronic heating system has a circulation pump and that takes the coolant through the hot water heater. I think its the Stbd engine that has the water heating loop, and it would be about 9ft away from the hot water heater and have a longer hose (PEX) run. I'll check soon.


Ah ok cool thanks for the info mate.
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Old 01-10-2019, 04:59 AM   #4564
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Matt, here is a pic of my tie in for water heating, although your engine is unlikely to have the same fittings. Itís the blue and black 1/2Ē ID hoses on bottom right. The take off is from the upstream side of the thermostat housing.

Make sure you install an isolation / bypass manifold in case you develop a leak in your coolant lines.
If possible, run your coolant lines on a steady downhill slope to the heater to avoid any air locks in the system. Also an engine coolant top up reservoir is a good idea if you donít already have one. Attachment 84061

Sweet thanks for the tips mate. I have to run uphill unfortunately. The tank will be about 4-4.5mtrs from the engine. Yep have one of those reservoirs fitted. Figured it was a good thing to have.
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Old 01-10-2019, 05:04 AM   #4565
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Matt
Here is a pic of the heat exchanger on my starboard engine for the hot water system. The PEX hoses go to the HWS. The black hose comes out of the front of engine block and returns to the rear of the engine block, a dedicated circuit that is not connected to anything else. No pump in it. Both black hose 3-4 ft. You can see an aquastat on the heat exchanger. That turns on the hydronic coolant circulation pump. The full heating system schematic is in the pdf.

As I mentioned earlier, I can get hot water from Raritan HWS heater element, the Webasto hydronic circuit, or the engine. The schematic shows that I have a 'summer loop'. What this means is that I can run the Webasto to get hot water without heating the whole boat.

Another item on the schematic that I should explain is the auxiliary heater tank. It has a 240V element also. This is used when at the dock on shore power, in winter. It provides about 5-7į of heating for the boat without running the Webasto diesel unit. It was installed to avoid running electric fan heaters when not on board, as they can be a serious fire hazard.

The guys at the PT Shipwright's Co-Op really know their stuff, and my boat's heating system design and installation is first class. Of course now I am Queensland I don't need to heat the boat very often.


Holy cow thatís a decent unit. Here I was panicking about a silly ol hws tank haha.

Hahaha yeah not now itís summer for us mate. Youíd be looking for the AC switch I suspect.
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Old 01-10-2019, 05:05 AM   #4566
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Matt, I can't find any shot of my engine that shows the in and out of the coolant supply as it runs through the hot water heat exchanger. However, from memory there was a 12mm (approx) hose outlet set into the larger diameter water hoses roughly either side of the coolant header tank. Something like that would definitely work, just pressurised from the water pump.


All good Pete. Thanks mate.
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Old 01-10-2019, 05:09 AM   #4567
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This afternoon I fitted the accumulator tank and ran the cold water lines through for the kitchen, en-suite and shower.

Then I cut the line coming from the back of the water pump and took a section so I can get some hose fittings matched up to it so tomorrow I can fit the Hot water tank and connect it all up.

Pretty good afternoon

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Old 01-10-2019, 06:22 AM   #4568
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I would suggest you to use some rubber washer/pad under your pump, this help a lot to absorb vibrations, well at least it did make a big difference for my jabsco pump.

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Old 01-10-2019, 07:45 AM   #4569
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I would suggest you to use some rubber washer/pad under your pump, this help a lot to absorb vibrations, well at least it did make a big difference for my jabsco pump.

L


Yeh the pump has rubber grommet feet that the screws go through :-) thanks for the tip.

Speaking of vibrating, does your engine sit on rubber engine mounts or fixed straight to the engine beds ? Mine bolts straight to timber beds like it did when it was first made. Iím thinking I should check out the timber beds and insert engine mounts.
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Old 01-10-2019, 08:12 AM   #4570
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Mine is mounted on mounts bolted to the bed. Not sure if they have rubber pads or not, to be honest never checked the mounts in details beyond checking for corrosion and that everything was tight. I don't have any pic showing the mounts.

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Old 01-10-2019, 08:29 AM   #4571
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Mine is mounted on mounts bolted to the bed. Not sure if they have rubber pads or not, to be honest never checked the mounts in details beyond checking for corrosion and that everything was tight. I don't have any pic showing the mounts.

L


Cool thanks mate :-)
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Old 01-11-2019, 07:33 AM   #4572
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The hot water tank is in the boat ... yeew.!! Just need to finish plumbing it into the engines coolant system, run a cable for the 240v 1200w heating element and run the cold water line to it and weíre good to go.
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Old 01-11-2019, 08:50 AM   #4573
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I am amazed to see how much space you have to work! I wish I had so much!

If I can risk another suggestion, I would double clamp fittings on soft hose so to reduce the risk of having one popping up under pressure as this is not an enjoyable experience ( don't ask how I know ).


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Old 01-11-2019, 10:10 AM   #4574
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Another SPLASH step getting completed! YEA!!
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Old 01-11-2019, 12:43 PM   #4575
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Sweet thanks for the tips mate. I have to run uphill unfortunately. The tank will be about 4-4.5mtrs from the engine. Yep have one of those reservoirs fitted. Figured it was a good thing to have.


My Kuumo water heater installation manual says that the heat exchanger port on the HW tank ( or temperature control valve if equipped) must be lower than the coolant outlet on the engine.

Do you have any other options for mounting the HW tank?
It might be worth checking with your tank manufacturer before you get too far into it.

Edit - I see that Iím too slow in my reply Matt. Youíre unstoppable.
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Old 01-11-2019, 01:43 PM   #4576
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My Kuumo water heater installation manual says that the heat exchanger port on the HW tank ( or temperature control valve if equipped) must be lower than the coolant outlet on the engine.

Do you have any other options for mounting the HW tank?
It might be worth checking with your tank manufacturer before you get too far into it.

Edit - I see that Iím too slow in my reply Matt. Youíre unstoppable.

Look... Up in the Sky! It's a bird, it's a plane... NO!! It's Super Matt; disguised as a human boat rebuilder!!!!!!!!!!!!
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Old 01-12-2019, 02:37 AM   #4577
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My Kuumo water heater installation manual says that the heat exchanger port on the HW tank ( or temperature control valve if equipped) must be lower than the coolant outlet on the engine.

Do you have any other options for mounting the HW tank?
It might be worth checking with your tank manufacturer before you get too far into it.

Edit - I see that Iím too slow in my reply Matt. Youíre unstoppable.


Lol ... I did check the installation and the uphill mounting is fine under 90į so I think Iím good.
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Old 01-12-2019, 02:38 AM   #4578
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Look... Up in the Sky! It's a bird, it's a plane... NO!! It's Super Matt; disguised as a human boat rebuilder!!!!!!!!!!!!


Lol
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Old 01-14-2019, 06:36 AM   #4579
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Well the hot water system is plumbed in. Just need to top up the Engine coolant and then hardwire the heating element and sheís done. One more task closer to the July launch ...
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Old 01-14-2019, 07:16 AM   #4580
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Well the hot water system is plumbed in. Just need to top up the Engine coolant and then hardwire the heating element and sheís done. One more task closer to the July launch ...
Then paint the hull, put it in the water and clean up your yard mess. That will make the owner happy.
Wife excited about you being "almost" finished?
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