Grant/ Aerona ASHP expensive...

[JeffGiraf]

I am pretty sure rads are too small as they are ancient and small by modern standards! Also landlord was cagey anout them which means she knows too! However these rooms heat through rising air too as they are upstairs

 

But downstairs rooms with ufh also struggle kitchen and downstairs bedroom never get above 16degC even with doors closed

[Beelbeebub]

I had a cottage where the radiator in the hall was absolutely scorching and all the other rads were like warm. The boiler short cycled and lots of gas was burnt. 

 

We closed the valve on that rad right down and all the rads became warm, the boiler stayed on for long continuous burns and the cottage was warm for not much more money 

[JeffGiraf]

2 minutes ago, Beelbeebub said:

As I said the other option is one rad being "too open" and starving the other ones. 

Just downloading an IR app now!

[Beelbeebub]

Just now, JeffGiraf said:

I am pretty sure rads are too small as they are ancient and small by modern standards! Also landlord was cagey anout them which means she knows too! However these rooms heat through rising air too as they are upstairs

 

But downstairs rooms with ufh also struggle kitchen and downstairs bedroom never get above 16degC even with doors closed

The ufh should be able to get those rooms warm if it did before. The flow temp shouldn't be very high ie a HP should be able to achive the temps. 

 

My suspicion is too. Much flow of going via the radiators, which is shutting down your HP, the UFH then doesn't have a supply of warm water to "top up" the loop temp via the mixer valve and then they underperform. 

[Beelbeebub]

2 minutes ago, JeffGiraf said:

Just downloading an IR app now!

You usually need to buy the camera too, I use thr "top Don" one, it just plugs into your phone and away you go. 

[Michael_S]

I guess an experiment might be to shut off all the rads and see if that helps with the downstairs.  Also check there isn't a bypass valve somewhere that is allowing the suspected 'short circuit'.