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    Nest Heating and Water Valve

    Still trying to understand Nest and wiring. I now know I need 2 new 2 port valves and a new cylinder stat. The Nest 3rd Gen wiring for an S-Plan system shows 3 wires to both of the 2 port valves labelled O, GR, and BW - Can someone give me an example of a suitable valve?
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    Replacing Honeywell Smartfit (S Plan)

    I currently have a Honeywell Smartfit connected to on oil boiler/pump in an S Plan arrangement, works well but the programmer has started to play up and I would like some more smart control. I am thinking about getting a Nest and I know it is not directly upgradeable from Smartfit. The CH is...
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    Oil burner chimney problems

    The chimney on my oil burner is showing considerable condensation. I am not an expert, but I assume that I need a metal flue liner installed, the chimney is 6 inches in diameter, is it simple case of putting a 5 inch flue liner inside the existing 6 inch chimney?
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