Gravity Fed 1 Header Tank?

[stryder58]

Howdy Plumbing chaps.

Ive messed with a few gravity fed systems over the years ie pump/ valve replacements but Im a bit stumped after helping a mate clean his system and change leaky valves.

Its gravity fed and heated via gas back boiler. It only has 1 tank that feeds the HW cylinder and tops the CH up. Is this correct?????
Always come across 2 tanks.

Hes ran bath after putting cleanser in the downstairs rads and the water is brown.

Is there any chance that the CH water can get back into the HW cylinder.

Im working on assumption its just crap from bottom of header (although it is plastic and pretty new).

Cheers.

 

[stardanny]

Is it a standard looking cylinder? With only one large cold water, yes?

Could be a primatic cylinder when during filling, it fill the heating first and when it is full, a air gap is created inside cylinder and this is what is separated between heating and hot water. Your might had lost it air gap and now mixing.

Here the info: http://gasboilerforums.com/primatic.html

Daniel

 

[stryder58]

Thanks Mate

Sounds like it is.

Ill tell him to get it sorted.
Bizarre never come across this ever.

Thanks again.

 

[stryder58]

From what I have read I shouldnt be getting hot water if the bubble isnt there.
But its piping hot??

Any advice??

 

[St0rmer66]

Also you should NOT have any kind of inhibitor or chemicals in the system on a Primatic cylinder! . It needs to be clean water only.