Drop in pressure in downstairs hot tap

[delboy19]

Hi

I've recently experienced a drop in pressure in my downstairs hot water tap. It happened after I filled a bath and emptied the tank.

I've got electrical heating so no gas boilers etc.

The upstairs taps on ther bath sink, shower etc use a pump due to the pressure being too low. Previously it was a trickle upstairs.

The pressure is fine for about 2 seconds when the tap is turned on.

Any ideas what is causing this and can I rectify it?

Many thanks in advance!

 

[cider]

Must be an air lock. Can you back fill hot feed via sink mixer or washing machine plumbing?

 

[delboy19]

Must be an air lock. Can you back fill hot feed via sink mixer or washing machine plumbing?

Hi Cider

Could you explain how to back fill? I'm a plumbing novice!

Cheers!

 

[yerino]

Backfilling:

If you have a downstairs MIXER tap. Open your hot on full and put your thumb over the spout... then slowly turn the cold on (still with your thumb over the spout) and let the cold mains push down the hot.

You might get a little wet.. hope you got strong thumbs.

Take care.

 

[twgas]

or it may be a lack of water getting into the tank - make sure the call valve is dropping and refilling the tank at a good rate.

 

[delboy19]

Hi Yerino/twgas

I don't have a mixer tap. I have bought a mixer tap to fit this weekend but wished to get the pressure query sorted first (in case it had an adverse effect on the new tap). Should I fit the new tap and follow your recommendation?

re tank refill. The refill seems to be the same rate as before.

Thanks again