Hi. Looking to change the pump on my combi boiler as the existing one is extremely noisy. The current one is a Grundfos UPS 15-50 pump with fixed speed. Does anybody know if I could purchase this pump and change just the pump head and use the existing body so the pipe work is not disturbed? https://www.screwfix.com/p/grundfos-ups3-15-50-65-domestic-heating-circulator-230v/503fh Thanks.