How to Drain a Ariston Mircogenius II 27 Boiler?

[Hightowermark]

Hi i need to drain this boiler in order to fit some new rads, how does
one go about this.


There is a drain valve under the boiler which looks like a hose pipe
can fit on.


Other than that i dont know what to do, but keen to learn.


thanks, it's a sealed system with a filling loop under the boiler.

Also i heard i can add chemicals to the system via a towel rad as it's upright?

 

[kevplumb]

look for

one of these

and dont forget to turn the boiler off before you start

 

[Hightowermark]

I know there's one under the boiler but cannot find one on the lower floor rads, so it's the only one. So i knock off boiler, do i need to do anything to the radiators?

Thanks

 

[kevplumb]

if the rads you are changing are upstairs and the boiler is downstairs you should be ok

if not it might be easier to remove a rad and put a hose on the valve

turn the valves off first tho

if you open the bleed screws upstairs after the pressure drops it will drain quicker

 

[Hightowermark]

Yes the radiators are upstairs, but i need to back to the boiler 22mm.

Also adding fennox etc, is this easier through the towel rad?