I have replaced a burnt out circulation pump, no leaks and the heating is working throughout house. Problem I have is that the noise level emited from the pump has greatly increased to previous. I replaced a grundfos UPS 15-60 pump with a Wilo Gold RS 60. Suitability to change the Grundfos with this model of Wilo is stated on the packaging. My question is: What can I do to reduce the noise (or what have I done wrong to that has cause the increase) or is the increased noise synonymous with this brand of pump?