Relief valve for Unvented Indirect cylinder

[Volunteer]

Hi, I have moved into a house with a 200litre S/S unvented indirect, cylinder that was installed 17 years ago. Perhaps regs were different back then because the cylinder does not have either an Expansion Vessel or Pressure Relief Valve fitted to the heated section . However the boiler connections to the cylinder do have an Automatic Air Valve on the flow and an Expansion Vessel + Pressure Relief on the return. There is also a Pressure Relief Valve and Pressure Reducing Valve/Gauge fitted in line with the mains cold feed. Is that enough or could I "T" a Pressure Relief valve and/or an Expansion Vessel into the 22mm hot water outlet pipe as it exits the cylinder? The pipe is from the side of the cylinder not the top.

 

[SimonG]

Depends if you have your g3 qualification.

 

[Volunteer]

Hi, No I don't.

 

[Plum Bob 66]

Hi, No I don't.

Then no, you couldn't, but I would suggest you talk over your concerns with a g3 qualified plumber who should be able to put you right.

 

[Reg Man]

It is against the law to work on stored Unvented hot water systems unless you are competent to do so, hence G3 qualification. Get someone who is qualified to look at it. It does not sound safe from your description of the installation.

 

[lame plumber]

photo of your system would be interesting

 

[Plum Bob 66]

photo of your system would be interesting

Very!

 

[helpsy]

Internal expansion gap?.??

 

[AWheating]

as far as i can remember 17 years ago unvented safety devices where along the same lines as today. Its been about 16-17 years since i first did unvented cylinders when i was at college doing my apprenticship and all the normal devices where there from memory.

 

[GasmanxxxR1]

thermal store?........ need pics

 

[Best]

You need to get somebody experienced to check if it is unvented or a thermal store & what all the parts are for & if any need serviced or replaced. Very confusing as there are so many different variations of them.
Both types need regularily checked & serviced, but if it is unvented you have to be qualified.

 

[Howsie]

I'm not sure what you are asking tbh. What is the problem?

 

[Volunteer]

Thanks every one, I will try to find a local G3 qualified guy as suggested.

 

[mountainman]

Thanks every one, I will try to find a local G3 qualified guy as suggested.

You won't have to try that hard imo, advertise on this forum for someone in your area and a G3 will reply.
🙂