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First the good, 2nd baby emma born Friday!! now out numbered 4-1 including dog so plans for shed (sorry bas) well and truly underway. Bad news, boiler kaput.. well sort of. Potterton netaheat 10-16 Mark II F, Honeywell smartfit S-plan open vented system (previously working for over a year)...

Can't find any specifications for the potterton netaheat 10-16 MKII boiler (S-plan open vented system), so can anybody tell me if it has a pump overrun facility?? I understand that you can test just by monitoring the pump after turning CH off using the room stat?? I have a kettling problem...

After reading this forum, I've decided on 2 solutions to my boiler bang/kettling problem. 1. A good descale 2. Automatic bypass valve (As all but one rad has TRV's). Descalers 1. Scalex 1ltr - £3.50, Sentinel x200 £11.99, Fernox (whatever) ~£20 Any recommendations? do you get what you...