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Turned out the second hand pump I bought was faulty. After installing a brand new RP75TU, my shower performs beautifully.

If I close the valves on the output flexible couplers and I switch on the pump and it still stops with the dry run protection, is that proof the pump is faulty? I'm assuming the pumps can't run dry if the outputs are closed off.

Yes, both inlets and both outlets are 22mm.

We've had a Salamander RP50TU installed for our ensuite shower and although the shower is adequate for washing, it's too weak for a pleasant experience. So I decided to buy a second hand RP75TU to see if would solve our issue. Following the instructions I commissioned the pump properly and...

I have thought about buying a 2nd hand RP75TU from Ebay (not willing to pay £350+ for another pump), but I don't like the plumbing I've been left with. Funnily enough, when the plumber originally installed the pump in the loft, the pipes to the shower were nice and efficient and the flow was...

Going off on a tangent, the long run for the hot & cold outputs from the pump going across my loft to my shower is in 15mm. It disappears into the bathroom wall to the enclosed mixer valve, but would replacing the 15mm pipe with 22mm reduce the head loss even if it has to go down to 15mm for the...

I see. Any suggestions on high flow shower heads? All the ones on Amazon seem to be "eco" and unlikely to make things better.

It's a Salamander RP50TU. That doesn't really explain why the flow is fantastic coming out the shower hose with no shower head.

The cold water is supplied by the cold water tank which is about a metre above the pump in the loft. It is only 50 gallon so we have had to have a water starvation unit installed, but the water in the tank has never fallen enough to cut out the pump while having a shower.

It's not a thermostatic mixer, just a manual mixer which was originally in the en-suite when we bought the place this year. I should have specified, the Salamander pump in a twin impeller and is used to supply both the cold and hot to this one shower only.

I've had a Salamander negative head pump installed in the airing cupboard, just above the HWC. The HWC has has an Essex flange with the required anti-gravity loop installed and the cold water tank is about a metre above the pump in the loft. The outputs from the pump go back up into the loft and...