Hot water pump

[jtheobald]

Hi,

I have a gravity fed system and the flow to hot taps is abysmal. I, therefore, fitted a Grundfos Home booster; there is a little improvement but not enough. My plumber said he could hear air going into the pump so I wonder if I've installed it correctly and if I need to fit a flange into the cylinder.

The hot water feed comes out of the cylinder and is then tee'd. One branch goes up to the loft and the other feeds the taps, where I have installed the pump. Is it possible that the pump is drawing air from the expansion pipe and is therefore inefficient?

Thanks.

 

[Madrab]

Yes, most probably, turn it off till you sort it out or you could damage the impeller.