Hot water install.-gctid819099

[Jjcpsca1]

I changed out my water heater that was leaking from a 6 gal to a 11gal.

This is also one that has the heat exchange from the engine, as did the old one.

Can anybody tell me what this part actually does?


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[smitty477]

"Jjcpsca1" post=819099 wrote:
I changed out my water heater that was leaking from a 6 gal to a 11gal.

This is also one that has the heat exchange from the engine, as did the old one.

Can anybody tell me what this part actually does?

Looks like an anti scald valve - did not the instructions for that new water heater tell you that?

It cuts off the hot water from the engine when it exceeds a specific temperature or it adds cold water when it exceeds the temps - cant quite see the details in this picture..

[Jjcpsca1]

To be honest I just switched everything over from the old to the new as it was.

It definitely is a pressure control valve and I cleaned it all up before I put it back together and replaced the hoses that were bad.

I just wasn't sure what it's purpose was?

Your response makes absolute sense.

[smitty477]

I had thought that all the new water heaters are required to come with these new valves on each one.

Maybe I am wrong or forgot - maybe 12 years back or so they did not have the anti scald valves on any of them.

The 45 Bayliners used to come with two HWH's in series for 18 gallons total or so volume.

note - if that is a Kuuma hot water heater I think the instructions are online as well

[Jjcpsca1]

Thanks, I'll check online.

[706jim]

Perhaps thats why my 246 didn't have the heat exchanger loop hooked up when I bought it. Water does get hot (175F)

[2850Bounty]

That is a tempering valve that restricts engine coolant flow (to the water heater's "heat exchanger"). Look closely and you will see that in order to trigger a "over-temp" scenario and to restrict engine coolant flow, it must sense an over-temp at the potable Hot Water outlet side.

It does this as to control potable hot water MAX temperature..... so yes, ultimately it is an Anti-Scald device.

It's actually there to protect the "who pooped my pants?" crowd!

Anyway...... if you are happy with it, and if it works as it should..... I guess that you leave it installed.

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[user134924]

I have a 3288; anyone know which hot water heater is a direct replacement for OEM one? If one exist? Looks like my heat exchangers are in rear and head toward red dot heater too. 1992 model.

Thanks.

[Terkar]

User134924 - Any 11 gallon heater will work. Don't worry about rear inlet, outlet as it is easier to work with if front hookup. The reddot heater is fed from different lines coming from port engine, water heater is from Stbd engine.

[Car2n]

What you need to take into consideration is getting the old one out and the new one in. Mine just barely cleared by a quarter inch.

[user134924]

Putting in new hot water heater on 3288; Do I need to purge the air out of the hot water exchanger prior to hooking up or can the system purge itself when I hook it up? If I need to purge air what is best way?

Thanks.

[builderdude]

"user134924" post=821203 wrote:
Putting in new hot water heater on 3288; Do I need to purge the air out of the hot water exchanger prior to hooking up or can the system purge itself when I hook it up? If I need to purge air what is best way?

Thanks.

Best to start a new thread on your subject but the system will self purge if plumbed correctly.

[2850Bounty]

"user134924" post=821203 wrote:
Putting in new hot water heater on 3288; Do I need to purge the air out of the hot water exchanger prior to hooking up or can the system purge itself when I hook it up? If I need to purge air what is best way?

Thanks.

[color]blue wrote:
I agree with Dave...... start a new thread.

Let us know if this engine is fitted with a Closed Cooling system or not.

It will make a slight difference re; the purging process. [/color]

.

.

[Sunbird]

In regards to the tempering valve- I ordered a new water heater from Kuuma and it did not come with one. The valve that is shown at the beginning of this thread was what Kuuma originally used. However it had a failure mode whereby the valve could fail internally and allow anti-freeze to mix with the outgoing hot water. For this reason Kuuma no longer supplies or uses them.

This leaves you with a possible scalding problem. I found that Watts makes a tempering valve that uses the fresh cold water supply and adds this to the hot water out connection. This valve is adjustable so you can set the maximum temperature of the hot water leaving the valve. This valve has no connection to the anti freeze side of the tank so it eliminates this failure possibility.

[2850Bounty]

"Sunbird" post=821288 wrote:
In regards to the tempering valve- I ordered a new water heater from Kuuma and it did not come with one. The valve that is shown at the beginning of this thread was what Kuuma originally used. However it had a failure mode whereby the valve could fail internally and allow anti-freeze to mix with the outgoing hot water. For this reason Kuuma no longer supplies or uses them.

This leaves you with a possible scalding problem. I found that Watts makes a tempering valve that uses the fresh cold water supply and adds this to the hot water out connection. This valve is adjustable so you can set the maximum temperature of the hot water leaving the valve. This valve has no connection to the anti freeze side of the tank so it eliminates this failure possibility.

[color]blue wrote:
And that is how it should have been all along!

Using the E/G temperature to regulate the potable water temperature was silly to begin with. [/color]

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