ASHP - UFH Water Temp

[richo106]

Hi All

 

This is the first winter in my house, I currently have an UFH with 100L buffer tank that feeds upstairs and downstairs UFH. The upstairs are on the aluminium spreader plates

 

I am currently on the octupus cosy tariff which I have been happy with and been working well but i know this would need tweaking in colder periods (like now)

 

My UFH buffer tank was set to 25 degrees on the ASHP controller, I forgot to check this until this morning when the house was struggling to get to the desired temp 21 degrees

 

I have changed my UFH temp to 35 degrees but what have people found the best water temp to use?

 

Many Thanks

[Conor]

We've ours set to 35c. Translates to about 30c at the manifolds. Design temp is 28c so works well .

[mk1_man]

What heat pump do you have?  We have Vaillant Arotherm + 7kWh unit with UFH.  We have it running solely using weather compensation and its been running great, even with the temp dropping last cuple of days internal temp stays constant.  The flow temp rises and falls automatically dependent on external temp. Has been running at around 27 degrees flow (same at manifold) but today with 0.5 degrees outside this morning it rose to 32 degrees and then later this afternoon dropped back to 29.

 

Edited Tuesday at 18:15 by mk1_man

[richo106]

I have the Panasonic aquarea 12kW but not running it on weather compensation.

 

However I’ve been looking into it tonight as our upstairs is not warming up properly and think there may be an issue with the upstairs manifold/actuators etc 

 

The downstairs manifold flow temp in is 30 deg and the temp out is around 23 deg and can feel the pipes slightly warm as expected

 

However the upstairs manifold the in flow temp is 26 deg and the out flow temp is also 26 deg 

 

I have attached a pic of my actuators upstairs ( they are different  to downstairs) the thermostats click in and out as they should but the actuators don’t seem to change

 

any advice or anything to check would be very much appreciated. This is my first time with ASHP , UFH so any suggestions as simple as possible are welcome 

[richo106]

Just to add I have one pump that pumps water to both the Upstairs and Downstairs manifolds, when a zone calls for heat the pump kicks in.

 

 

[richo106]

Sorry for the message spam but just thought I would add another picture showing that it does indicate flow on the valves 

 

I have just looked at it again before bed and now the flow and return is both 30 deg so still no difference between them