old UFH advice requested as some rooms are cold and some too warm

[Kev23]

Hi Guys, i wonder if you can help as  there seems to be a wealth of knowledge here.

 

First let me give you a bit of history.

 

My property is around 15 years old. I learned later that UFH installer had not been paid by the builder so with hidsight i suspect the system has not been commisioned as i have no paperwork, the old installer refuses to do any work on my system because he had not been paid by the builder.

 

The system was powered by a gas boiler and was upgraded to a heatpump a just over a year ago. When it was powered by the gas boiler similar issues occured but they were likely masked a bit because of the much higher flow temperature. With the heat pump i am using weather compensation.

 

The cicuits are/ were like this

 

Gas boiler ->  blend valve -> pump -> manifolds

Heatpump -> buffer tank -> pump -> manifolds

 

Note there is only one pump in the whole system 

 

 

 

 

The manifolds have no pump, they look like this

 

Downstairs

 

Upstairs

 

 

The problem i have is that some rooms are consistantly around 1.5 degrees colder than other rooms while some others are warmer.

Downstairs the kitchen is colder while the utility is warmer than average

Upstairs the En Suite is colder while the Bathroom is much warmer.

 

Each circuit has one of these flow rate monitors

 

 

 

 

the troulble is that most of these are stuck at the top, even if there is no flow.

 

For the ones that are working i can adjust here with an allen key

 

 

 

Turning Clockwise decreases the flow

Turning Anti-Clockwise increases the flow

 

I set a one of these to 2.5 but if other circuits come on it drops to around 1.5, is this normal?

 

What might be the best way forward, should i decrease the flow rate on the cold rooms and increase the flow rate on the warm rooms?