Noisy hot water pump and low hot water pressure

[Pete Saxon]

Hi all,

I'm hoping you can help me with a couple of questions I have for my inlaws.

There house is 30 odd years old and the hot water pump is quite noisy go say the least. It appears easy enough to replace as isolation valves at top and bottom and two nuts to release the pump. My question is, what would be a suitable new pump to replace it with. The current pump is a grundfos UPS 18-60. Photo attached.

The second question, is about the hot water pressure. In short it's really low and having a shower here is painfully slow experience. Weve moved in for 3 months as moving home and our new one isn't ready so hence I'm trying to now sort all these things for them. Would the new pump sort this? Is it something else that can be easily diagnosed and remedied?

Thanks in advance everyone.

Pete

 

[Ben-gee]

That is your central heating pump and if is ancient! I would say it won’t necessarily be easy to replace as I expect the valves will fail and then require draining to replace. To get a replacement pump you need to measure the distance between valves, probably 130mm, - although if the valves fail this is less important as draining would make it easy to alter.

A new pump here will not affect the hot water.
I presume you have a gravity system, in which case a shower pump is what you will need.

Bear in mind the effectiveness and longevity of the shower pump is greatly impacted by the method of installation, ie it needs to be done properly.