I NEED ADVICE PLEASE. WE ARE HOPING TO HAVE A VIESSMANN BOILER FITTED. CURRENTLY OUR OLD BOILER HAS 3 WIRES FROM BOILER TO PUMP. PLUMBER SAY WE CAN MAKE DO WITH THIS ALTHOUGH 4 OR 5 WOULD BE BETTER. THE FOURTH BEING THE PUMP OVER RIDE WIRE. VIESSMANN RECOMMEND AT LEAST 4 . PLUMBER SAYS BOILER CAN RUN ON 3 .OTHERWISE IT MEANS DRILLING HOLES TO RUN AN EXTRA WIRE THROUGH THE CEILING. DON'T WANT TO TAKE ANY SAFETY RISKS . HELP ?
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