Shower Pump problem

Makhaira

Makhaira

Makhaira

Soldato
Joined
23 Nov 2007
Posts
4,969
Location
Lancashire, UK
Just installed my new shower and I thought I was therefore up and running, but clearly not.

I've had a Grundfos Niagara 1.5bar pump installed, with a York valve coming off the top of my tank for the hot water feed, and the cold feed coming from the tank in the loft.

Having primed the pump, it ran without problems. For about 40 seconds. At that point I started to get a lot of cavitation noise, so I turned it off.

Following several short runs of it, it always seems to start being noisy after approx 40 seconds. The manual recommends a max hot water temperature of 60C to avoid pump noise, which is what my tank was set at, so I've dropped that to 50C to see if it helps.

The worry in the back of my head is whether it's possibly down to the hot cylinder being drained faster that it's replenishing, meaning that the pump pulls in air? If that's the case, then I'll get the plumbers back, but it's a headache I could do without!

Any and all thoughts/suggestions welcome please, been dealt a bit of a blow since I was looking forwards to a shower in my own house tonight!

Cheers.
 
:(. Just checked what was fitted and there's definitely a surrey flange in the top of the cylinder, and no sign of any leaks from pipework. Is there anything else I could try or check before I call the plumbers back? Don't want to get a call out charge if it's not their fault!

Cheers.
 
I've spoken to the plumber, he thinks it might be because he's tapped into the cold feed to the hot water cylinder rather than taking a new feed direct from the cold tank. Would this explain it? I'm going to make sure I'm in when they do the work so that I can ensure it sounds right before they leave.
 
Thanks, I'm on my phone atm so I'll read that this evening. I presume the rate of cold input to the hot tank dictates how quickly you can pull hot from the top of the tank? Err fore by splitting that single feed I'm guessing that I empty the cylinder a bit, thereby pulling in air from a gap at the top of the cylinder?
 
Just been reading up on surrey flanges (they said it was a York, which I understand is just a Surrey with an adaptor?). It also appears that the shower feed is connected to the wrong part, as the shower feed comes from the top of the flange, not the side! Grrrr.
 
Me too, but unless there's a variant where the shower feed is meant to come off the top instead of the side, that's not the case!
 
No pics at the moment, all my tiling gear is infront of the airing cupboard at the moment!

I'm more than a little cheesed off, but playing it nicely nicely at the moment since I obviously want them to come back and make good on their work. In the meantime, I can only run the pump for about 30 sec or so before I get air entering it, so I'm trying to avoid using it to as great an extent as I can.

The thing that has really irritated me is that this bit of the bathroom refurb I didn't do myself as I wanted to get a proper job done of it! So much for that sentiment!
 
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