If I don't need hot water I don't need this, right?

Davidasailor26 · Oct 22, 2022

It looks like that valve is on the same side of the pump as the through hull? If that’s the case that’s the intake side of the pump, so it wouldn’t be involved in a water heater circuit at all. Assuming it’s on the input side it’s more likely that it’s a way to flush the raw water circuit. That could be done to either flush the block with fresh water, or to run antifreeze through it when winterizing. You’d put that cutoff house into a bucket of fresh water or antifreeze, open the valve, close the seacock, and run the engine.

JoeWhite · Oct 22, 2022

This raw water pump is needed to keep the engine cool. The water heater uses the antifreeze water loop to heat the fresh water

Richard19068 · Oct 23, 2022

Davidasailor26 said:
It looks like that valve is on the same side of the pump as the through hull? If that’s the case that’s the intake side of the pump, so it wouldn’t be involved in a water heater circuit at all. Assuming it’s on the input side it’s more likely that it’s a way to flush the raw water circuit. That could be done to either flush the block with fresh water, or to run antifreeze through it when winterizing. You’d put that cutoff house into a bucket of fresh water or antifreeze, open the valve, close the seacock, and run the engine.

Presumably there is a valve (seacock) between the strainer and the thru hull? I assume that black disc is the backing plate for a thru hull and there is a valve on it but it's not visible in the photo.

Hollyberry · Oct 23, 2022

A perhaps more interesting questions is where does the teed off line above the strainer go ??

Ralph Johnstone · Oct 23, 2022

Richard19068 said:
Presumably there is a valve (seacock) between the strainer and the thru hull? I assume that black disc is the backing plate for a thru hull and there is a valve on it but it's not visible in the photo.

It looks like (I'm hoping) there is a valve in there.

@xavpil , please check to see if there is a valve there and ensure that it works. Big safety item.

PS. got a kick out of the escape clause in your signature ..........

Davidasailor26 · Oct 23, 2022

Hollyberry said:
A perhaps more interesting questions is where does the teed off line above the strainer go ??

I think that’s the recirculating line from the thermostat. The Universal 5411 has a strange setup with that. See the other related thread at Water filter clarification...

Justin_NSA · Oct 23, 2022

xavpil said:
i don’t know what a valve would look like and where to look for it….

If the down side of that strainer goes straight to a thru hull then you have a big safety issue. If that line leaked or broke anywhere you wouldn't be able to shut off incoming sea/lake water. I.e. your boat could sink. Every thru hull should have a shutoff behind it.

Ralph Johnstone · Oct 23, 2022

xavpil said:
i don’t know what a valve would look like and where to look for it….

You asked and I be tellin' ya :

Something like this should be located in between your strainer and the thru-hull as I mentioned in post #7. When the handle is in line with the attached piping, it will be open to allow water to flow. When it is turned at right angles to the attached piping, it is closed and does not allow water to flow. Just make sure you got one in there and that it works, otherwise I won't be able to sleep at night thinking about your predicament

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Justin_NSA · Oct 24, 2022

xavpil said:
Oh man this IS a valve!! I didn’t even told it because once again, it seemed like the name for an important ad specific part that even told wouldn’t find!!
thx for taking the time
and actually there is one. Old. Very old. And I a, changing it to something reliable

Are you sure you have one behind the thru hull? It's not evident in your picture .

If I don't need hot water I don't need this, right?

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