Fernox F1 & F3 and identifying a Single-Feed Indirect Cylinder

[Pooh81]

Hi Guys

We recently took our radiators off the walls so we could paint, do up the bathrooms and do general renovations (including moving some radiators around) - and have now noticed that the water in the radiator pipes is very dirty. (the system stood open for 2 months which likely was not the best idea as rust seems to have formed)

I purchased some Fernox F3 to run a clean, and once clean - add in some F1 inhibitor.

In bold, the bottle says "Not for use in a Single-Feed Indirect Cylinder". From what im reading, I dont think I have one - but if you guys could perhaps confirm, it would be hugely appreciated. Images of my heating (it supplies hot water too)

Thanks in advance, and have an awesome day further!

 

[Exedon]

That's a expansion vessel above your boiler so it's a sealed system.
Your cylinder will be indirect NOT single feed.
You could useful fit a system filter on boiler return will help clean it up and create a easy way of putting chemicals in.