potterton puma 80e hot water flow drops after 5 seconds

[bbfwhb]

Hello,

I have got a problem with a potterton puma 80e.
When opening the hot water tap, hot water flows at mains pressure for a about 5 seconds and then drops to about half or less.

Does anyone have an idea what could be causing this?

Thanks in advance.

 

[Agile]

Its a little unclear what you mean to say!

Do you mean the flow rate?

If so can you measure it in litres per minute?

Was it always like this or has it changed?

The Puma has special design features which are not obvious!

Tony