Unvented Tank Hot Water Supply question

[ramjet666]

I had my vented hot water tank replaced with an unvented tank recently.
The pipe work was altered and an expansion vessel fitted.

Is it normal for the hot supply to release the contained pressure after cold water has been heated and expanded?

This is more noticeable for example after a bath has been run and a large quantity of water has been re-heated.
This often leads to pressure relief noises coming from the tank cupboard of which I would think is the expansion vessel.

 

[SafeGasInstall]

If you get big rush of water from your tap when only just open your tap and then goes down a bit this is Indication that cylinder is working ok , posible not sufficient flow of cold water to Unvented Cylinder ! I can not view pictures on my fine but I think your cold water supply is not big enough

 

[iiplumbing]

Are we sure that the pressure vessel is connected to the hot water down service pipe?

Looking at the picture, it connects to the loreal hair product box then runs behind the cylinder (22mm pipe) then drops to low level, where does it connect into the hot water service?

Also on the pressure relief outlet, is there an open tundish lower doen with a 22mm pipe running away from that?

www.iiplumbing-services-derby.co.uk

 

[iiplumbing]

tricky working out pipes and where they run from disjointed pictures

Silly question, has anyone checked to see if the expansion vessel has been pre-charged?

www.iiplumbing-services-derby.co.uk

 

[Howsie]

I'm not giving any more advice on this. Think the OP should get the installation sorted properly before fiddling with it...

 

[SafeGasInstall]

No advice should be given on this forum iiplumbing , pls edit your post

 

[dancinplumba]

as above, please remove post or it will be reported

 

[iiplumbing]

I'm not giving any more advice on this. Think the OP should get the installation sorted properly before fiddling with it...

Howsie, what is making you think this is such a bad installation?

And where have you spotted this is a dangerous installation?

Surely, if you think its dangerous you shoul tell the OP why and how, then the OP has the information to go get a qualified engineer to do the corrections

This is what the regulations say (for OP information)

Requirement Part G3 – Hot Water Storage

Building Regulations Schedule 1 Part G3 deals with unvented hot water storage
systems (UVHWSS) because unless installed correctly the cylinder could explode, or
cause danger from hot water discharge.

What are unvented hot water storage systems?

These are systems relying on storage cylinders fed directly from cold water mains and which do
not incorporate a vent pipe to relieve excess built-up pressure to atmosphere. The pressure for
the hot water system is derived from mains pressure supply rather than pressure from a coldwater
storage tank.

What are the requirements for the installation?

A hot water storage system, which does not incorporate a vent pipe to atmosphere, may only be
installed by a person competent to do so and precautions shall be made to:

(a) prevent the temperature of the water at any time exceeding 100°C and,
(b) to ensure that the hot water discharged from safety devices is safely conveyed to
where it is visible but will not cause danger to persons in or about the building.
What information do I have to provide when submitting an application?
Under Regulations 13 and 14 of the Building Regulations 2000 (as amended), persons
submitting a Building Notice or Full Plans with a Local Authority must, where the work involves
the provision of an UVHWSS provide a statement which specifies:-
-
the name, make, model and type of hot water storage system to be installed.
-
the name of the body, if any, which has approved or certified that the system is capable
of performing in a way which satisfies the requirement of paragraph G3 of Schedule 1 of
the Building Regulations.
-
the name of the body, if any, which has issued any current registered operative identity
card to the installer or proposed installer of the system.

It should be noted that The Water Supply (Water Fittings) Regulations 1999 also apply to such
installations.

Who can be considered a competent person?


“Competent” persons should possess a current Registered Operative identity card for the
installation of UVHWSS issued by organisations such as the Institute of Plumbing or the
Construction Industry Training Board, following assessment by a recognised training body.

www.iiplumbing-services-derby.co.uk

 

[iiplumbing]

See photo for an idea of setup. All I want to know is it normal to see increased pressure from the hot tap after water has been heated. I dont know if this is normal or not. Then if it is not normal i can get someone in to take a look at the setup and sort it out. The original plumber is now retired.

Hey ram, you originally said that it was a recent installation but then you said the guy has since retired, did he emigrate?

Was his name bodgeitandscarper?

BTW Mr Watkins, I take it that you is refering to the lack of insulation on the pipes?????

Ram, to be more helpful, and I dont know why ppl here are being a bit obtuse, (maybe they can tell me why, as I am a newbie on this forum), the pipework needs to all be insulated to comply with regulations when any alterations such as this is carried out. It reduces standing losses and is for the good of the country (co emissions wasteful use of fuel etc) as well as saving you money.

www.iiplumbing-services-derby.co.uk

 

[Barry98]

thread closed please for your own safety get a competent person in