Unvented Central Heating

[dudecar]

Hi,
I am planning to ungrade the central heating system in our house.
Since we dont have gas or oil. We have opted for an electric boiler. Simlar to the TRIANCO AZTEC ELECTRIC BOILER.
The system will need to be an unvented as there is no available loft space.
I have been reading up on the internet about then boiler it it says that i need to install and Automatice bypas valve.
The question that i have,
Do i simply install the valve between the flow and return of the boiler.
Also do i need on if i am having to towel radiators installed that are when either the boiler is on.
The expanison vesel dose it need to be install so that there is a discharge to a suitable location incase the temperature get to great.

Thanks in advance

 

[kevindgas]

you post is hard to follow as really badly written, but i will try to help you
with what i think you are asking.

Auto bypass - only needed if no suitable alternative available or manufacturer specifies it must be fitted, you will require one if you don't have at least 5,000 btu of permanently open rads (a towel rail is only around 1700 btu)
fit it as far from boiler as possible but must be after pump on flow and then joins the return after last radiator connection

Auto Air vent - ideally fit at highest point of system

Expansion Vessel - can be connected to system anywhere on the main flow or return pipes (preferable on the return - Less heat)

Pressure relief Valve- again anywhere on the main pipes but must be connected to pipe leading to a safe discharge point (drain, outside at low level etc)