Unvented Hot Water Cylinder - District Heating

[Sarlington]

I'd be really grateful if anyone could clear this up for me...

I'd like to install an ensuite in my flat. I currently have a gravity system with district heating and hot water. I cannot put in a pump as the cold water tank is 25 gallons and can't be increased. No room for it.

The heating is a completely separate system - Old school one pipe system, which does not touch the current vented hot water cylinder.

The mains pressure is probably around 1.2 bar, but I'm not confident that it's good enough for venturi style showers... (and I wonder if 2 of these could be run at the same time with demands on the hot and cold water).

Is it possible to put in an unvented hot water cylinder (to increase pressure of water in the flat) when our hot water is pumed (up 6 storeys and 6 flats along, maybe 70m) to the flat by a central boiler?

Some plumbers say it is possile to install a basic unvented cylinder (not megaflow or anything so compex). In any event it would have to be one without an immersion (because I won't be able to control the temperature of the flow from the central boilers).

If this is possible, would it still have to be notified to the council as per the building regs, even though there wuld be no heating of the hot water in the cylinder?

Thanks very much!
Simon

 

[BLOD]

Some pumps only require 25 gallon storage (eg new team).If it's only the shower you want
Better pressure on then this might be worth checking out.

 

[BLOD]

All unvented installations need to be notified regardless of how the water is heated.

 

[GasmanxxxR1]

An unvented cylinder wont increase the pressure of water in the flat, its only as good as the incoming mains pressure

Not sure what you mean by a basic unvented cylinder because they all work off the same principal, its just that megaflows have an internal expansion system.

What do you mean "it will have to be one without an immersion as you cant control the heat from the boilers" controlling the temp of the heat source of an unvented cylinder is critical

 

[Sarlington]

Thanks for the info re New Team and notifictions.

By basic, I meant inexpensive.

In terms of controlling the temperature of the water entering the flat, this is controlled in the central plant room because the system is communal. All of the valves which currently allow water to flow into and out of my current vented cylinder still work. Presumably the new cylinder would be able to shut off the HW flow into it if it detected the temprature was getting too high (as well as having temperature and pressure release valves).

Is there any specific kind of indirect unvented HW cylinder that would suit?

Thanks
Simon