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If a boiler is classed as 30 kw, does that mean that at max it puts 30kw into the flow or uses 30 kw of gas (with 10% or whatever going through the flue)?

From what I understand, on a central heating system the fill and expansion pipe and the vent pipe should be taken off the the main flow pipe before the pump, and also be taken off within 150 mm of each other. (I have seen indications from posts on here that there may be other suitable...