I actually put Fernox F5 in the old one system before we had the new boiler and flushed it after five days so it shouldn't be that bad right now.
Why is it every job you do you feel you are better off doing it yourself?
We had underfloor heating laid too in the bathroom before it was tiled. Half of it is cold half of it is hot. F*cking jokers... had nothing but problems recently and got all tradesmen on recommendation.
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