sirpatchuk

We are using normal trvs, not the digital evo home ones. can it be setup so there is a pump for the ufh and a pump for the upstairs radiators? Would that change anything?

ok… turns out only one pump feeds both the ufh and radiators.. just had this email from the installer; The system has two pumps, one of the pumps feeds the hot water to the low-loss or the hot water tank. The second pump is after the low loss which feeds both the radiators and the UFH. This pump feeding the UFH and the radiators is on its highest setting

Although we have four zones (three downstairs and one upstairs), they are all set to the same temperature(s) and for the same times. We are on Octopus ASHP tariff so at the cheap times we up the temperature. So generally at 0400 the house requires heat. It may be the case that only upstairs requires it, it is dependent on temperatures. However, I have tested it but forcing only upstairs to come on.

Thanks for the reply. Sorry, but a lot of this I don't understand so I apologise if I give the wrong terminology or ask a silly question. I attach pictures and can provide more. We have Evohome with four zones; Downstairs three zones for the UFH. Upstairs one zone which controls all the upstairs radiators which all have TRVs. It is difficult to tell but I would say that when it is only upstairs calling for heat the noise is worse yes. I understand that there is one pump for the UFH and one pump for the radiators - both Grundfos.

Hi. Yes - the other thread was the problems with my UFH. We had the noise then with the upstairs radiators too. After a lot of pain we had all the UFH heating ripped out as it was simply never going to work. We now have an overlay system UFH downstairs which works, and they swapped the Grant 17KW for a Samsung 12KW. The Grant ASHP worked but they said it was oversized. When the new installers did the UFH work I asked them to look at the radiators too. They did but said all the pipework looked fine..

We had an oil system before and all new pipework put in. Pipework correct size.

Yes, the noise passes onto the next radiator but appears to be less as it goes down

I am hoping someone can help as no plumber has been yet. We have a Samsung 12KW ASHP (no issues with it) We have UFH downstairs (no issues) We have radiators upstairs. When the radiators come on they cause significant noise and I cannot sleep. We have had people look at it, balancing, draining etc. Still the noise. We have 7 radiators upstairs. The noise is worst in the master bedroom and I think this is the first radiator. It is hardly anything in the further bedrooms. The pipework is all the correct size. I know very little but it sounds like it must be the water pressure / amount of water trying to get through? Many thanks. noisy radiator 2.mp4

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

@Radian when I had a quote before they stated they would use Insta SuperBead. Is that the same?

@Radian you are talking me into it… just the worry! we also have these big patio doors which we didn’t plan on getting curtains for but guessing this is a big heat loss? It’s an east face garden.