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OK, I last posted in here in 2009 with guidance given on a new system. https://www.diynot.com/diy/threads/thermal-store-heat-bank-or-two-combis.170502/ At the time I was running 2 combi's twinned to supply whole house. In the 2009 post I was looking for guidance into a replacement system as...

I currently am running Two Ideal Isar Condensing Combi boilers (5 years old) One is completely broken, the other is on the way out. They run independantly for C/H on 2 zones but are T'd together for DHW (due to mains water pressure (6bar) and output requirement). I need to fix/upgrade my...