Hi,
Please can anyone tell me how often the CH should be drained down and the inhibitor replaced? I've got two years in my head but I might be thinking of car antifreeze (the blue rather than red version)!
I've been using fernox but their web site is a bit vague on the issue and says to buy a tester. Inhibitor is readily available but I don't see anyone selling tests and I wonder if I did, whether the test would cost more than the inhibitor!
I can't remember whether I used F1 or MB1 last time, if that make a difference, I have used both in the past; buying whichever was the best price in the past at the time.
It is a vented system. Would the interval be longer in a sealed system? I imagine the F&E tank constantly allows oxygen into the system whereas a sealed system contains only a finite amount?
Is it worth me converting the system to a sealed type? What is involved in this? I know many here like sealed systems and say that there is only a finite volume of water so leaks are limited, but what other advantages are there? Some would say no need for a loft tank but to be fair, that hardly takes up any room.
Regarding the drain down, is it worth using a cleaner beforehand like Fernox F3? I know I used one when we first moved in and didn't know the condition of the system but since then we have changed a lot of the radiators as we have redecorated the rooms, so I am quite confident that the system is in good shape now. Is cleaner only needed in bad / dirty systems? Fernox say to use it but they have an interest in generating sales!
TIA