Hot water system

[Seastoke]

Please get it checked.

 

[Seastoke]

Yeah, that's what I said above. A few times. A PRV is a safety valve and has no place as an inlet valve.

Yes you are right nearly but I think that is a temperature relief valve which opens on excess temp. I might be wrong.

 

[Seastoke]

The red ones are commonly known has blow off valves, most men should have one.

 

[Sessa Lel]

The red ones are commonly known has blow off valves, most men should have one.

HAHA
Do you think I should move the red PRV to hot water outlet pipe?

 

[stelican]

I think the above is correct the rubber are to warm the water from the engine, the expansion valve ie the red one should be on the top pipe hot going out of tank with the arrow pointing to the hot pipe out.

The usual practice for the expansion valve is to have a discharge pipe into the bilge or overboard.It doesn't need to be at top of tank

 

[stelican]

HAHA
Do you think I should move the red PRV to hot water outlet pipe?

No.
You don't need one on the hot water pipe out of the tank as that would only allow over pressure water into the hot water distribution.
The whole bloody point is to get this over pressurized water out of the system. Or would it work? Maybe if you T'd it in but not normal.

 

[Sessa Lel]

No.
You don't need one on the hot water pipe out of the tank as that would only allow over pressure water into the hot water distribution.
The whole bloody point is to get this over pressurized water out of the system.

Just ordered the correct valve, hot water staying off until new valve fitted.

 

[Clash]

No.
You don't need one on the hot water pipe out of the tank as that would only allow over pressure water into the hot water distribution.
The whole bloody point is to get this over pressurized water out of the system.

The type of PRV that's currently installed on that tank has an outlet that exits the hot water system.

 

[stelican]

The type of PRV that's currently installed on that tank has an outlet that exits the hot

Yes. It's incorrectly installed if that is cold feed to calorifier and would not allow water into it unless opened as stated by OP

 

[Seastoke]

There are two different types one is put on the cold after the stop tap and is is adjustable , the red one is hot water blow off has to be at the top of the tank . But I have had my say now , I think you need some help. To sort it.

 

[stelican]

There are two different types one is put on the cold after the stop tap and is is adjustable , the red one is hot water blow off has to be at the top of the tank . But I have had my say now , I think you need some help. To sort it.

Interested to hear your views, What is the point of putting one on the cold supply after a stop tap ( never seen a stop tap on the cold supply to calorifier). Why does blow off valve need to be at top?

 

[stelican]

Just looked at photo of calorifier post 33 and it looks like there is a pressure valve on the cold inlet the would work when the pressurised water is expanded by heat.

 

[Seastoke]

Interested to hear your views, What is the point of putting one on the cold supply after a stop tap ( never seen a stop tap on the cold supply to calorifier). Why does blow off valve need to be at top?

Well it’s a adjustable if the pump is giving to much pressure you can turn it down , and the temperature release is on the hot side to stop the tank over heating and bursting. Have what you want that is what I have on my tank, it also works if the engine gets the water to hot., just my way I like it.

 

[Seastoke]

Just looked at photo of calorifier post 33 and it looks like there is a pressure valve on the cold inlet the would work when the pressurised water is expanded by heat.

I agree but it has cold water one side and heat always goes to the top.

 

[Clash]

Just looked at photo of calorifier post 33 and it looks like there is a pressure valve on the cold inlet the would work when the pressurised water is expanded by heat.

Except that cold inlet is going into the PRV release side. As I said above, plumbed by a loon.

 

[Seastoke]

Right this is a true story, when there used to hot tanks in houses, if the immersion heater over heated it had a expansion pipe that put hot water back into the cold water tank in the loft , in one situation the hot water made the cold tank soft with it being plastic , the tank buckled and hot water scalded a child in bed.

 

[PaulRainbow]

Yes you are right nearly but I think that is a temperature relief valve which opens on excess temp. I might be wrong.

You are.

 

[PaulRainbow]

Never heard of a PRV on the cold inlet to the calorifier, it would be pointless.

The pump pressurises the cold system, including the inlet to the calorifier. The PRV releases excess pressure, it's a last ditch safety mechanism, normal pressure should be dealt with by an expansion tank. The PRV can dump the water into the bilge, into a container, overboard, or back into the water tanks.

There is no such thing as a "temperature relief valve", that's a thermostatic mixing valve. You set it to the max temp you want at the outlets and it adds cold water to maintain the temperature to the set value. It does not "dump" any water.

 

[Clash]

Right this is a true story, when there used to hot tanks in houses, if the immersion heater over heated it had a expansion pipe that put hot water back into the cold water tank in the loft , in one situation the hot water made the cold tank soft with it being plastic , the tank buckled and hot water scalded a child in bed.

I'm doubting that story tbh. Excepting some very shoddy plumbing.

Cold water storage tanks have an overflow built in to prevent just such a scenario. This is usually a pipe out under the eaves, or to some other outlet. Of course if somebody cut corners and didn't fit an overflow, as you were.

 

[stelican]

I agree but it has cold water one side and heat always goes to the top.

Expansion is throughout though