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Hi, yes the vent on the highest rad is fully shut off. Gas is air - whole system was power flushed - all sludge removed, status of water in system before inhibitor added was equivalent to tap water in both PH and TDS. But I will do a check to make sure. System has been running on number 2...

I've had a problem with frequent venting of the radiators being required. The setup I have is open vented with a Potterton Prima f60, Grundfoss 15-60, 3 port valve, on a Y plan, with bypass loop fitted. Only 2 rads have TRVs - bathrooms, and bypass valve is closed. There are seperate feed...

Apologies if contravening forum rules - first post - will not include in future :oops:

Yoda, £300 for a powerflush is about right. I charge £295 + VAT all inclusive of chemicals. For 15 rads, it'll take about 6 - 7 hours to completely flush out. Cheers, Richard www.agoodplumber.co.uk