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    Air in a pressurised system and water in tundish

    Evening all, After having the heating on for a couple of months now, I've noticed a drop in system pressure - 1 bar down to 0.25 bar. Along with this, I've noticed the rads on the middle floor (of 3) are not heating up. This evening, I went round and bled the 4 rads and a lot of air came...
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    Sealed System Pressures, (hot & cold)

    In a sealed system, should there be any pressure difference between system running (hot) and system off (cold)? My system heated by an ideal classic ff250, operates hot at 2 bar. But whenever the system shuts down the pressure drops down to 1 bar within about 1 hour. Is this normal?
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    Where does black sludge come from/what is it?

    Where does the black sludge in a sealed system come from?
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    Does Leak Sealer Work In A Cracked Heat Exchanger?

    I have an Ideal Classic ff250 with a small crack in the heat exchanger which is causing a small leak - 1 or 2 drips per minute - when the system is cold. Question is, is it worth trying Fernox F4 as a first fix?
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    Best Leak Sealer on the Market?

    I've got a small crack in my Ideal Classic FF250 heater exchanger which leaks (1 or 2 drips per minute) when cold. Before I go for a heat exchange replacement, I thought I would give a leak sealer a go. Question is, which is the best? Fernox F4? P.S. Boiler is 12 years old, heat exchanger 8...
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