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you should hear the boiler start slowly and after about 1 min the gas valve should open fully and you will hear the difference, is that happening?

You can change just the ball assy on the valve. Drain the system to below the valve, undo a coupkr of screws and the valve can be removed. New ones come with a new O ring.

Just to be certain, is it the room stat you hear clicking off at 20 deg when you've set it to 30 deg? If so it looks like a very faulty stat.