sirpatchuk

The radiators seem to get warm enough at 35 degrees flow rate. The UFH is celotex, spreader plates, chipboard, tiles or carpet.

no appears same flow rate for radiators and ufh

We are using anywhere between 40 and 70 and we are not getting above 16 degrees downstairs. Upstairs radiators fine. Downstairs UFH takes AGES to heat up and if I leave it on all day that is when the usage is incredibly high and it doesn’t seem to make a difference to the ambient temperature.

I think I have a combination of issues and not sure where to start first. think my Honeywell Evohome talking to the grant heat pump controller may be causing the pump to operate more than necessary

What temp have you set them too and what kWh are you using?

what have you got your thermostats set to? Are they always calling for heat? we have three zones downstairs for UFH and each room upstairs is it’s own zone with a thermostat radiator

Wow, 1kw

I am thinking put the minimum and maximum flow rate at 35, turn weather compensation off and set the thermostats to 25. Then it will always be calling for heat and therefore be running constantly at the low flow rate. We can use the log burners in the evening for the extra heat… thoughts?

The minimum and maximum outside temperature for weather compensation what should these be?

Hi, I posted before about our ashp not getting up to temperature and it turns out a zone thermostat was in the wrong place. Now I would like advice on where to start with testing the settings. Granted, probably not the best time to test them with the current weather. Grant ASHP 17KW UFH downstairs (3 zones) 7 oversized radiators upstairs (all smart thermostats) We have a 1950s detached, 4 bed house in a village. No cavity wall insulation (but booked in to be done) Good loft insulation. - weather compensation on/off? - thermostats set high or temp we want to achieve? - we have two log burners… use them?

This is where I am going to get confused! So @JohnMoare you saying 'no no' to https://isothane.com/products/technitherm/ but go with the Insta SuperBead....

@JohnMo Some more pictures. I believe we have a buffer. We have three zones downstairs - hallway, lounge, kitchen/diner Each room upstairs is a zone. It is getting downstairs to the required temperature is the issue.

To be fair that wasn't the best photo as the brick wall on the right was plaster boarded so I think / hope they filled in the other insulation. More photos I have found.

hi, this is probably the only photo I have which will give some idea