richo106

Hi All I have been away for a few days so now back at looking at my heating I tried to increase my flow rate on my UFH heating but only managed to increase it slightly to just over 2 in the end (embarrassingly my mrs loved it when I unscrewed it too far without thinking and I got a nice splash in the face!) One thing I am still tweaking is my weather compensation curve, its currently on 35 deg -5 to 25 deg 15 deg. But in error I set my downstairs thermostats to 22.5 and with a 1 deg hysteresis it was bouncing off it which I am guessing this is something we want to avoid. I have now changed all my house thermostats to 23.5, just confirming that the aim of using the weather compensation is that the UFH runs 24/7 and keeps the house a nice temperature - hopefully around 22.5/23 ish Is this how you guys run UFH with ASHP? Thanks again

Thank you @Gary68 I have confirmed all my actuators are working as they should.

Thanks again @JohnMo I will try both of these later when I get home I know when I looked yesterday my flow rate of my upstairs manifold was around 2L/m

I ran 24/7 since 7pm last night using weather comp (35 deg 0 and below) my ground floor heated up lovely and hit 22.5 within 2 hours and kept hitting it and going off through the night...is this right? However my upstairs is really struggling to heat up when the doors are shut to the bedrooms (e.g my daughers bedroom didnt get above 16.5 deg) but now its at 20 deg ish with all the doors open My gut feeling is that my upstairs UFH is just undersized/ineffective especially when its cold outside Currently I can't change the individual flow temps to the upstairs and downstairs UFH as they are off a common buffer temp but one options i thought down the line was to run my buffer at a higher temp and then blend the d/s UFH to reduce temp? Any ideas at all what to try next to try and improve my upstairs heating level? as when waking up this morning it felt cold getting out of bed (with temp ranging from 16.5 - 18) especially with the heating running all night and has been on 24/7 since Tuesday morning (apart from 4pm - 7pm daily) My set points are 22.5 downstairs and 20 deg upstairs, do these seem ok?

Will do

Thanks @SuperJohnG, those figures are almost identical to mine tbf even the ASHP usage was 39kWh and total 58kWh

@JohnMo actually I have just found this that was used to size my Ashp (I think) To be honest I have tried to make sense of this a few times and still not gotten anywhere with it. CombineReports_007400_001_2022-10-24_13-27-34.pdf

I have no design details or anything, they had all the details of my build insulation etc etc and they specced a 12kw ASHP. The UFH was designed by the company who just supplied it looking back this was very naive but I was non the wiser at the time and was just going with the flow🙈

Ooops..yup definitely meant to put on AVERAGE its been 55kWh

I have set my compensation curve to 35 deg to 25 deg, this was from 0 to 15 deg. I wasn't sure what to put for the outside temperature range though, are these figures suitable to start with? I have set my ASHP controller up like below, this is to make use of the cheaper periods for hot water. There was also the option for compensation curve shift but I left this at 0 For my own sanity, my house is 250m2 total area (125m2 each floor). I am solely electric and my total usage for everything on Tuesday, Wednesday & today (3 coldest days which ranged from -5 to 2 during the whole period) has been on 55kWh (£11) does this seem reasonable? The 4 weeks prior to this i was averaging between 160 - 180kWh (£28) per week in total Many Thanks again, really do appreciate your help

Thanks @JohnMo When you wind my thermostats out the way would you just set them all at 25 deg for example? Or set them at like 23 as a limiter? My only concern with this is my expensive period 4pm - 7pm, I could just turn the ASHP & Set my thermostats low in this period? So my ufh pump would be constantly going and circling heated water around? Thanks again for your help

Good Afternoon As you can probably tell from some of my latest posts I am trying to set up my ASHP/UFH system correctly as this is the first winter in my house I have been reading into it a lot and it seems general feeling is that the buffer tank temp is controlled on weather compensation curve My next question is how do you correctly set up the temp on the compensation curve? I have just had my buffer set at 35 deg In my ASHP (Panosonic Aquarea) manual it recommends 40 - 35, i know that is very generic so i was just seeing what are peoples set up likes so I have a starting point I have currently set my downstairs thermostats to 22 deg and upstairs to 19deg, i am also interested to see what other people set their normal temperature to be? Many Thanks

I know this has probably been bought up many times before on here but I am still toying with the idea of battery storage (I am an electrician by trade) I have no scope/plans to install PV as the house and its location (i.e. trees/ roof shape/chimneys) is just not suitable at all I am just trying to do some calcs to see if the ROI is worth it plus is it just another thing to monitor/replace when worn out etc... Has any body got an battery storage and making it work cost wise? Then there is also the sizing of storage, is there some sort of calculator to work this out? This is probably the wrong forum with this question Many Thanks

Hi @JohnMo Thank you very much for both replies regarding the energy usage and cosy tariff Regarding the cosy tariff I think it works well in the summer months so I can just do my DHW during the cheaper periods, also it has worked well from Sept to around now with just a little bit of heat required to maintain a nice temperature However in the winter months I going to run it 24/7 (with it ramping down during expensive period) I can also still programme it re-heat my DHW during the cheaper periods It will be interesting to monitor the energy usage during the milder days, as mentioned this is first time using a system like this so I am learning on the job I have attached my energy usage from my ASHP for the month so far and its pretty much spot on with what you said regarding the amount of energy quoted - quite a clear correlation with outside energy temps!

I have had my UFH on all day (apart from the expensive period 4pm - 7pm) and my electric usage for today will be around £11 (around 55kWh) compared to around £4 day all last week (25-30kwh) by timing my hot water and heating with the cheap periods Sorry for the daft question but do you think this is normal jump in usage during a cold snap. Since Monday night it has ranged from -2 at night and got no warmer than 2 in the day Would welcome some opinions on this if possible and how cold snaps effect other peoples usage etc I know usage will fluctuate during the year but i am just panicking now it will be very expensive to run during the winter months

It looks like the actuators are working correctly, when I opened a few zones upstairs there was a slight temp difference in flow and return temps to start with but soon gets back to almost the same ill change my water temp to 40 to see if that makes a difference at all

Its a new build Yes all bedrooms are carpeted but they are specific UFH underlay and carpets The bathroom is tiled and the tiles still feel cold! Regarding turning it off, I would expect to see Dt yesterday evening as the upstairs floor was pretty cold I will try remove the actuators as mentioned above, i have one area of floor (another bathroom) with no flooring yet apart from the T&G flooring so ill see if there is any warm there If not I will try upping the temp to 40 to see if this makes a difference too Many Thanks

Daft question...if i take the actuators off will the loops just be open? I will do this later when i get home

Hi All I have jumped on a previous thread but thought I would start a seperate one as I need some help/advice on an issue I think I have I have UFH upstairs and downstairs, downstairs in a concrete slab and upstairs in aluminium spreader plates below 22mm T&G floorboards. I have an ASHP with 100L buffer (set at 35deg). I have been running the ASHP hot water and heating in line with the octopus cosy tariff and has worked well like this, I know it wouldn't run like this when we hit cold snaps like now so my plan was to just leave it on and ticking over. The GF seems to be working well and the floor warms up nicely and all the rooms easily reach the temperature but the upstairs rooms are struggling a bit to get to there set point I was looking at the GF manifold and the water temp in was 30 deg and return temp was 23 deg However the first floor manifold was slightly different as the flow and return temperature was same (both 26 deg at 9pm, both 30 deg at 11pm) I have a common pump that does both manifolds I am after any kind of advice/information on this potential issue as there seems to be no heat transfer and the upstairs struggling to heat up. It all looks there is flows on the indicators I have ran this all night and still no difference in flow temps this morning Thanks in advance

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

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.

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

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

Hi All I have got a query if anyone could help, as you know from post above I have now completed my VAT reclaim and received the money, this money has no allowed me to look at getting quite a few blinds installed (£3-4k) and my driveway (at least £20k) Even though I have completed my VAT return can I still ask the contractors to charge me the lower 5% vat rate? Can I them submit an additional claim for this VAT? My blinds will be done Jan/Feb time but my drive won't be done until mid-late next year Any information/advice on this would be appreciated Many Thanks

Yes I physically had a hard copy of every invoice as when I started my build this was the way i was going to do it, however since being able to do it online you can do it using the spreadsheet template found online. So didn't send any invoices to start with. The spreadsheet needs: Invoice No, Date, Description, Name of Supplier, VAT Reg No, Total amount excl. VAT, VAT amount, Invoice in your name I wouldn't say random but a selection of the higher amount ones. There was none for small amounts. I had 359 invoices and they only asked for 21