Hi have a potterton performa 24he hot water flow is very slow. Have changed plate heat exchanger and made no difference any ideas?

[Steve embassy]

Hi have a potterton performa 24 he hot water flow is very slow. Have changed plate heat exchanger and made no difference heating is fine any ideas?

 

[ShaunCorbs]

What’s your flow rate into the boiler ?

 

[PETE 123]

Filter on inlet?

 

[Aquarius]

Slow at all taps, or one particular outlet?

 

[Steve embassy]

Filter on inlet?

Main cold water pressure is good

 

[Steve embassy]

Main cold water pressure is good

Filter is clean

 

[Steve embassy]

Slow at all taps, or one particular outlet?

Pressure is low on all hot taps

 

[Aquarius]

Stopcock fully open? As per @ShaunCorbs what’s your cold inlet flow rate?

 

[Steve embassy]

What’s your flow rate into the boiler ?

Not sure but it's got to be high maybe 15 litres per minute

 

[ShaunCorbs]

Maybe not have you got an external filling loop ?

 

[Steve embassy]

Maybe not have you got an external filling loop ?

Filling loop is external cold main to heating flow

 

[ShaunCorbs]

Test your flow rate from this ? Does it match your cold kitchen tap / main

 

[Steve embassy]

Test your flow rate from this ? Does it match your cold kitchen tap / main

Will do getting a bit late now thanks

 

[Steve embassy]

Will do getting a bit late now thanks

Why and what will this prove

 

[Ric2013]

Why and what will this prove

Whether the supply to the boiler is a decent flow, or if there is a restriction somewhere. A lot of people come on this forum with similar problems as yours and very often it turns out there is a valve they hadn't noticed or mentioned that restricts the flow through the pipework.