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Frost protection in regard specific elements of the system I've outlined already such as frost protected thermostats or do you mean in general, i.e. pipes below the frostline, lagging etc? Forgive my complete lack of knowledge in the area -but I can say my water system is an unvented indirect...

Hi all, First time poster, but have done a fair bit of reading in search of information previously. My problem in a nutshell (albeit a large one) - Oil fired central heating External boiler Pumped System I've a 3 zone/channel system in placed controlled by a Horstmann H37 XLPlus...