We have many reviews which praise how quiet the pumps are and then we get customers who find that in their particular situation the noise is a problem. We are happy to talk you through solutions but here are a few things to consider.
There are a number of things you can do to reduce the noise or even eliminate the noise so lets go through them one at a time.
Air (First thing to look at)
If the pump is pumping a mixture of air and water it will be much noisier than if its pumping just water.
Is the pump fitted at a high point in the pipework which traps air (see fitting diagrams)
Is the white motor barrel pointing upwards – this can trap air.
Is the pump being starved of water (blocked valve or hot water cylinder silted up).
Transference of Vibration (Second thing to look at)
Part of the problem is transfer of vibration from the pipe to the air.
It could also be transference of vibration from the pump to the pipes, from the pipes to a wooden joist. and the joist vibrates. It could be the pipework itself is resonating.
Imagine a violin string drawn over a wire and you can appreciate that from the bow, to the string, to the wooden violin the amplification of the noise can multiply.
In the past we have had customers who have inserted a length of plastic pipe which has resolved the issue.
The easiest and cheapest thing to do first is to remove fixings where vibration can be transferred to wooden joists.
At the same time muffle the noise by wrapping it in bubble wrap which will have two effects.
1.0 It will reduce direct transference of vibrations to the air.
2.0 It will change the natural resonance of the pipe.