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I am trying to fit a dimmer switch to a 200w halogen ceiling light with 12v transformer. I have tried a 400w dimmer, but the transformer hums. With a 250w it still hums but not so bad. Any way to stop the humming?

I have a pumped open vent CH system suppling hot water and heat to 9 rads. My problem is that I am constantly venting air from the upstairs rads (daily) I have recently change the boiler to a Ideal Icos HE18. Air still getting in system! I have changed the pump. Air still getting in...

I am just plumbing in a new sink and have used push fit 'Speedfit' fittings (not tested yet) and will be concealed in a stud wall. I am also moving a couple of rads a few feet. Considering using the same fittings for them. Anybody have any experience of the reliability for both uses. Do...