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I personally leave my analyser on gros as to me nett efficiencies are a bit of a fiddle from the boiler manufacturers to make there products seem better.
SimonG- A wet kit that takes me back, haven't seen one of those for a few years now, can you still get the fluid for it?
SimonG- A wet kit that takes me back, haven't seen one of those for a few years now, can you still get the fluid for it?