Heat Pumps - post here.

I need a radiator with an output of 1200 watts @ DT50

I guess I'll have to go with vertical, the ones they linked to dont look great though. https://www.thermtek.ie/vertical-radiators.html

Any recommendations?

Was just on to my heat pump servicing guy who did it last year around this time and he said to me that I will have to wait until early December before he gets to me.....if I had called a few weeks ago he said I could have been waiting 14 weeks he has so much backlog of work.

Last year when I called him and he was out to me in a week or two. He said hes the only man doing servicing in the south !!

I was just worried that it woudl be about 13- nearly 14months since the last service if he rocked up in Mid December but he said Ill be grand so long as its around a year. I suppose with that backlog they cant complain. Personlly I like getting it serviced just before the heating season just to give a once over but hopfully he might come sooner.

TBH I was kinda inpressed with the service I got last year he checked everything pressures, flow rates, the inline water filters checked, flow rates at all the manifolds, change the anode in the DHW section as I have well water, tested the unfloorheating liquid to see if that had enough stuff? cehecked every thermostat in it etc etc

All for about €300 (if you dont have an anode then €200) great peace of mind considering how much work my A2W HP does

I have a Joule/Samsung HP but the service guy is someone they put me on to and approved by them.

They sound great. Who are they?

Agree...that sounds exceptional VFM.

There is though. The heat pump knows the temp of your underfloor heating and how much heat it is losing (i.e. the temp of the return fluid which is a measure of your heat loss in the house). It uses that to decide how long it needs to run.

At least that's how mine works. Maybe yours is setup differently. I do have room stats as well but I usually set them high so that they are always open and let the HP decide when to come on/off.

If you have underfloor heating it would not release heat that quickly so that does look odd.

This is what I use on mine. I really only use the stats for informational purposes. I have one or two rooms I dont use so I turn the temp down on those but other than that the stats are set high (always open) and the HP decides itself when it needs to come on/off.

I can control that some bit by telling it to boost during the night rate electricity and cut back a little during the day but it does come on by day too.

It wont (or shouldn't) be running "all day". You need to crack open the manual for your HP and understand the settings rather than randomly trying things as you dont want to get a stinker of an electricity bill. Understand the settings first and then make small incremental changes a day or two apart as the underfloor heating will take 2+ days to adjust to each change.

Thats Brilliant, thanks for this it got me thinking and I'm starting to understand the way it all works.

I realistically only need two rooms heated so will increase the stat on the wall to the max temp with just the goal of keeping the flow open, the rest are bedrooms so I think I need a more accurate thermostat in one of the rooms.

I understand to get the right set point need to play around with the weather dependent curve. what feels too hot or too cold could depend on the day and as you mentioned a good reference would be a good temp stat with temp history. So if I can bring the temp on the WD curve too as low as possible without feeling too cold I will have it running as efficiently as possible. Obviously when weather gets colder the set point temp will increase automatically.

So I presume when my leaving water temp gets to my setpoint, the pump will cut out. Im going to get the solar gain etc during the day so pump probably wont be going much during the day, I also have the option to schedule setback, so can decrease -2c during day. at 11pm when my electricity is cheaper I can schedule it to increase by a 1c -2c's above set point to get the pump to kick in or will naturally with the weather dependent mode bring up my setup with the cold weather outside, all just needs trial and error.

John

Can you spilt the 2 (DHW and heating)? We use about 2.5 kWh a day for DHW.

Only put the heating on this week and use avg 3 kWh per day for underfloor.

House 210sqm 1 zone set at 21.5c

We retrofitted a heatpump earlier this year and did windows etc so, fairly good insulation/airtightness but not passive by a long shot. For October we've been using almost exactly the same amount of power as you on a per square meter of house basis. Haven't really managed to dial-in the heatcurve yet, the house is a bit too warm on the colder days. Are you leaving that temperature set all night too?

Hi guys, hoping someone can shed a little light here, not even sure if I'm on the right forum.

I bought my first house in June. It came with solar panels that heat the water tank for my pump shower. One of the pipes burst in the attic but it was just the pipe that contained the coolant so no water leak. The shower still worked fine up until a few weeks ago. I thought once I put the immersion/heating on it would heat the water for a shower however, it doesn't. The pipes in the hot press are all hot bar one. The system was installed in 2014 by activ8 solar company.

On the panel the thermostat is reading at 7.5 degrees. There are all different settings I've tried messing around with it but nothing heats the shower. My bathroom and kitchen sink has piping hot water so I can't figure out why the shower doesn't. If anyone has any experience here that they could share I would really appreciate it.

Ya I can seperate the two. DHW is about 3-4 kWh with space heating comprising the rest.

Your usage seems very low, fair play, you must be optimising your system. What flow temp have you set as a matter of interest?

Out of that 25 units, how much is your heat pump consuming though?

Cannnot understand how people only use 3kwh for ufh for a day even if its mild. I could use 3kwh when heating starting up for first 2 hours. Any f my friends with ufh seem similar to my usage.

Hi folks, quick question that might seem obvious but I'm not sure. How exactly do you read a flow rate meter? On the attached picture what is the flow rate? Thanks