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I've seen other people mention this topic but still not sure of the answer. I have a Vaillant Ecotec Pro28 condensing combi boiler. Do I achieve this temperature drop between flow and return at the boiler by shutting down the lockshield valves at the radiators, or is there another way to do...

I'm plumbing in a new combi condensing boiler. Should the system be plumbed to drain from the flow pipe? This is how it was set up on the old boiler, but it seemed to me to make more sense if it connected to the return pipe? Also, is it okay to use a gate valve for the drain, or is there...