Would it work?

[Riley]

If your gonna slate someone's idea at least do it constructively not just like a condescending superior... I'll get help with my project else where it's alrite.

So you are contemplating it. Look just don't. In a non condescending way mate you really need to be G3 qualified in order to work on a domestic hot water system. No qualified engineer willl even entertain the idea. Unvented cylinders are a. Designed to withstand the greater pressures of mains water the metal work and seams of a normal ventedcylinder are not. and B. Have safety devices integrated such as pressure relief, a temperature/pressure relief valve, a hydroblock, immersions with much improved thermal lock out and an expansion vessel all supplied specifically by the manufacturer, in fact most if not all manufacturers insist that their replacement parts are used to ensure the safety continuity. It is not just bits hashed together with whatever you can find. These installs are notifiable giving you some idea of the need for correct installation

If you are contemplating a pressurised hot water option then YOU MUST enlist a G3 engineer DIY is completely illegal and irresponsible for your safety and you family and neighbours

 

[Dotty]

I think you were told several times over during the course of the thread the difference between vented and unvented cylinders and what the ramifications could be.

What you seem to fail to grasp is that unvented cylinders store water that is heated up. Water expands as it is heated. And, because it is a sealed container, Boyles Law comes into play. Basically meaning that the water, in a fault condition, can theoretically reach boiling point far more rapidly and explosively than it ordinarily would.

This is why unvented cylinders are designed with so many safety features and why the person installing them must be trained and qualified to work on them.

Vented cylinders are not designed to cope with the temperature or potential build up of pressure.

And that's all you need to know.

Boats have hot water systems already designed and ready to be bought off the shelf. Don't try and make your own system up. You'll put the boat on the sea bed.