switching to an unvented cylinder, SW London

[neu]

Hi,

We're having our bathroom retiled, and refitted. We currently have a gravity fed system, but would ideally like to install high pressure fittings. Therefore we're interested in switching to an unvented hot water system. This is assuming the mains pressure is suitable (we suspect it is but haven't measured it).

Happy to listen to advice and opinions on the best options available.

We're based in the Kingston area.

Thanks for your interest,
Tom

 

[chris watkins]

Hi Tom
Welcome to the forum,
You will no doubt be aware that the installation of this type of hot water heater is covered by the Building Regulations AD Part G (3), not only should any installation be notified to your Building Control office but any work on these must be carried out by a competent person this should be confirmed by ask to see potential installers un-vent cards.
It is not all about the pressure with these systems, the flow rate needs to be checked as a minimum you will need something like 1.5 Bar & 20 Litres/Minute depending on the size of property.
Just remember the water undertaker is only legally obliged to supply a minimum of 1 Bar at the street side, the pressure can be turn down to this at any time.

 

[neu]

Hi Chris,

Thanks for the info. Yes, I was concerned about the regulations and safely of installing a sealed system, that's why I chose to use this forum for info.

By un-vent card do you mean their g3 registration?

Thanks,
Tom

 

[chris watkins]

Hi Chris,

Thanks for the info. Yes, I was concerned about the regulations and safely of installing a sealed system, that's why I chose to use this forum for info.

By un-vent card do you mean their g3 registration?

Thanks,
Tom

They should normally have a card to show they have passed training & assessment on these, BPEC is a common one but there are others. this is the minimum. Some companies have joined a Competent Person Scheme which allows them the register your installation for you, if not you will need to raise a Building Notice & pay the fee, check Kingston counsel web site.

It is just that around 75-80% for all installs I go to are not correctly installed.

 

[Howsie]

Welcome along!

We're based in Esher, I'll drop you a PM.