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