Shower Pump Help / Advice

[TVR keith]

Is the shower head blocked with limescale?

[Magic919]

Why do you expect fully cold to have better flow? Mine are equal. If you have poor hot flow and use a thermostatic valve then you'll limit the overall flow. It'll be worse during the cold months and better in Summer.

[skilly1]

Magic919 said:

Why do you expect fully cold to have better flow? Mine are equal. If you have poor hot flow and use a thermostatic valve then you'll limit the overall flow. It'll be worse during the cold months and better in Summer.

I agree, it seems the hot water pressure is causing the problems, not the cold water pressure. The pump is a dual hot and cold pump, as the cold is working does that mean it can't be the pump?

Any idea what coud restict hot water flow? It can't be outside of the airing cupboard as I recently added a flow to the second shower which comes from pipes in the airing cupboard at the top and that has the same problems.

[Gingerbread Man]

Other restrictions on the hot water are the isolation valve to the pump. The cylinder outlet and pipework. Shower valve inlets.

Tried pulling an airlock out of the hot?

[Rickyy]

Either an air lock or a worn pump. Try running the showers on full hot, with the heads removed and the hose as low as possible.

Also, probably not relevant, but who ever fitted the flange on the cylinder has done it wrong, there should be a constant rise to the hot water vent pipe. It looks as if it dips coming straight out of the flange.

[skilly1]

Gingerbread Man said:

Tried pulling an airlock out of the hot?

No - how do you do that?

[Gingerbread Man]

See previous post gubbins

[skilly1]

Gingerbread Man said:

See previous post gubbins

- Sorry missed you post earlier about sucking it out.

[Magic919]

The feed to the hot cylinder starts at the tank in the loft. Anything that limits the flow from there to the pump will affect output. It's a great pump, but strangle the input and output must suffer.

Can you check the cold feed right from the tank to the bottom of the hot water cylinder? Look inside the tank for any debris blocking it in any way.

I'm not clear how the second shower gets fed, to be honest. Might not be relevant, but thought I'd mention it.

[Jon1967x]

I assume the cold side is feeding correctly from the cold water tank and not off the mains?

Could just be a knackered hot water side impeller. I'm sure I've had to replace individual sides before now albeit on a different make.

[skilly1]

Well I have tried sucking out the air lock, checked all the valves are fuly open and had a look in the water tank (very clean and no blockages). I took off the shower head and tried going from hot to cold, with no luck. I also noticed downstiars (no pump) the cold runs quicker than the hot.

Water tank:


I have noticed the wide copper pipework reduces down to thinner plastic pipework in the loft, no idea why but both hot and cold do this.


This is where the 2nd shower splits off (spare pipe is the old direct feed):