Hot water shower???

Styk33 · Posted: Feb 02, 2004 12:59 pm Post subject: Hot water shower???

I have a 2000 Sanger V210 with a hot water shower. I was out yesterday boarding and finished my set and needed to thaw my feet. I have the boat running (put it in neutral and up the rpms to 1000 for voltage) and turn it on full hot. It comes out at about 95F for 30-40 seconds. Then all of the sudden it is sculding hot (150F+). It did this back and forth a few times before I was done. Is this becuase the thermostat was opening/closing causing the temperature change?

I plan on putting in a heater (aftermarket) to keep folks in the boat warm, and with this major change in the hot water shower I believe it will affect the air temp out of the heater. Or am I wrong?

I have not bought the heater (this weekend) and was curious if anyone has had this problem and does it affect the air temp out of the heater?

TIA

MrBlean · Posted: Feb 03, 2004 3:55 pm Post subject: Heater effect?

Is the shower temperature controlled by it's own thermostat or is it simply a fixed volume mixing device for hot water from the engine and cold water from the lake?

If the former, it could be a faulty stat in the shower head rather than variations in the water temp from the engine.

If the latter then the variation in shower water temp has to be due to variations in the hot water input temp from the engine in which case it will definitely affect the air blower temperature too.

However, being air rather than water output, the variation will not be as noticeable.

DiyGuy · Soul Rider Joined: 26 Dec 2003 Posts: 460

Heater - Different camps of thought on hot water takeoff.

OK.. I've scanned all the 'heater install' on this and other boards and still can't determine the BEST place to tap into the hot water side?

Some say on the engine drain plug at the bottom of the engine block, others say somewhere up around the thermostat.

And, for return water, especially to keep temps' constant ( low idle) to put in a "T" just below the raw water impeller.

Question is.. WHERE is the best place to get hot water from the engine to the heater core.

I'm headed to the junk yard to start pulling car heater cores! Will use same 12 V motor and fan controls as well! Most housings from ABS plastic will allow me to seal or cut additional holes for vents/tubes to be added.

MrBlean · Posted: Feb 10, 2004 1:14 am Post subject: Best locations?

DiyGuy - why not simply check a factory install? I have no heater but have considered fitting one hence would be curious to know how these are attached to the hot water supply.

melvinator · Criminal Joined: 26 Sep 2003 Posts: 80 City: caledonia

[quote="DiyGuy"] And, for return water, especially to keep temps' constant ( low idle) to put in a "T" just below the raw water impeller.

Right on the money, anybody with a heater should do this if they want better low rpm heat

As for where to get the hot water from, up by the thermostat will be your best bet. I have already tapped into my block for the shower and I think drawing that much water from the same place will have negative effects on heater output. Just my opinion though I have never tried it:)

MrBlean · Posted: Feb 10, 2004 9:02 am Post subject: Water return

Will somebody please explain to me why returning water from the heater to the input side of the raw water pump maintains a more constant heater temperature at low RPM? Is it because you are putting warm water back into the engine at a time when it is producing less heat itself?

Is not the best place to take hot water from as close to the flow exit from the block as is possible to achieve?

melvinator · Criminal Joined: 26 Sep 2003 Posts: 80 City: caledonia

The water you draw from near the thermostat is plenty warm. When you tie into the resurculating pump with a barb fitting the recirc pump does not keep the water flowing like it does then you T into the raw water input right before raw water pump. Bottom line is that it keeps more hot water flowing through the heater at idle. Hope this helps. If not go to malibuboatowners.com and look up heatercraft low rpm fix, they might be able to explain it better.

MrBlean · Posted: Feb 10, 2004 2:56 pm Post subject: Obvious!!!

Thanks melvinator. From that simple description I realise the raw water pump is "pulling" the hot water around the heater circuit from wherever it's tapped off the engine. The suction on the raw water pump is pretty damned mean and it's self-priming whereas the engine recirculation pump is a wimpy fan-blade affair that is anything but self-priming and just moves the water around the engine block to prevent hot spots.

Thanks again. Now I know what to do if I choose to fit a heater!

DiyGuy · Soul Rider Joined: 26 Dec 2003 Posts: 460

Late follow up!

Does anyone know where to get the "T" for the raw water intake hose? What size is it? Would just a home-depot T fitting work?

Trying to wrap up a project and got stumped here. There is a very small drain screw on the tranny cooler. Tried to take off that without cutting anything, and it works, sort of, but can't get a consistent flow out of it to offset the hot water!