I have installed a new Stuart Turner Monsoon twin impeller pump to increase the hot water pressure in my house.

The pluming side of things seems to have gone well, however, I am not receiving any hot water through my taps at all where as previously I would get hot water but at a slow dribble.

Is it possible that the wiring I have replaced between my hot water boiler and the new pump could be interfering with each other and preventing me getting any hot water?

I have attached some pictures below so you can understand the setup.



Water pump

Any help would be greatly appreciated!

Thanks, Ash

  • Installation instructions. – Tester101 Apr 2 '15 at 15:49
  • Thanks, I do have this manual already however clearly I'm not smart enough to have figured it out with the manual. Any other suggestions? Thanks, – Ash Apr 2 '15 at 16:20
  • Sorry, I didn't mean anything by posting a link to the user manual. I just found it, but didn't have time at the moment to read through it. So I thought somebody else might be able to use it to help you. – Tester101 Apr 2 '15 at 18:04
  • The user manual mentions "integral pump isolating valves", are those open? Does the motor make any noise or indication that it's running? – Tester101 Apr 2 '15 at 18:39
  • That's no problem, I didn't take it like that. The motor does run and the valves are open. I just cannot get any hot water out of any of the taps. I have a feeling it's an airlock problem, but can't seem to get rid of it – Ash Apr 2 '15 at 20:49

Take a look at figure 5 in the manual. (Or any of the other figures)

None of them show you connecting the pipes in parallel across the pump.

The cold comes in and out one side of the pump in series. The hot comes in and out the other side of pump.

Check your plumbing in the picture against figure 5.

They are not the same.

Do you have just the hot water coming in and you are trying to use bothe sides of the pump for hot instead of hot and cold?

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