A few weeks ago I drained my entire system down to fit thermostatic valves
and insulation behind some radiators. I refilled and tested and all OK. A
few more weeks will pass before I drain it again to add a towel radiator in
the bathroom. Is it wise to go this long without adding the inhibitor? I
have enough for one dose, but not two. The boiler is a 3 year old combi.
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