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If the pipework is under floor, that heat will rise into the rooms eventually, if it is in stud walls might be losing a bit there that doesnt benefit you, but if the cavity is small it will warm up quite quickly and not so much heat will be lost there once it is warm. Most of the heat should...

You do *need* the return water to be cool, (below 55 degrees max) to extract heat from the flue gases, which is what I said. You dont *need* a condensing boiler at all, but if you have one, you might as well use that function and save a bit of gas. Not sure what you are trying to say with your...

Set the operating temperature a bit lower if you are only heating one or two rooms, if its cooler going out it will be cooler still when it returns. The return water needs to be cool to extract heat from the flue gases, which is where the condensate comes from, the return water then goes into...