Heat Pumps - post here.

I have one chimney with a pillow in a bag (can be even better than a balloon for getting tight to surface area), figure i should do the other one too. Nerd in me wanted to do the math.

Also see some cold bridging at front door - tiles are ice cold at front door (with UFH in the area!) - not sure how to resolve that!

Of course if my heat pump is "the right size" and not remotely oversized, then these things combined are problematic.

Hi All,

I have 12kw Samsung heat pump using joule thermostat in each room. Underfloor throughout.

Since the cold snap , we find the water is not hot enough for showers. My wife would go for a shower around 6:30pm and would not be hot enough. I believe the water is heated during the night on night rate . I'm not sure though. hot water temp was set to 48. i have upped to 50c now & this evening I will try press the DHW mode 30 min or so before she has her shower to see if this will improve it

Over the New Years , we had guests also & was conscious of them having hot showers. I checked the temp in the morning and the temp of water to be 53c. I was delighted as i have never seen it at the temp & also surprised as the highest its set to is 50c? Can I set it higher than 50 & if so how do I do it?

Should i schedule it to come on at 5:30pm everyday or is it better to press DHW mode 30 min before showers?

Any advice appreciated

For example, just now the hot water was 47c . So to see if I could get it up to 50c as a matter of interest, i put on DHW on . Went back about 20 min later, it was at 45C . Its a bit of head wrecker :)

Thanks @johndoe11 . I guess I'm not 100% sure when my water heats so I need to find that out. I have been watching a lot of youtube videos. Going to try schedule hot water to come on at 5:30pm this evening & see if that helps . the priority mode you have mentioned doesnt appear to be activated

There will be a fill valve on your system. It will generally be a tee onto the underfloor flow line, before the manifold. It will come from your mains. Might look like the silver one below connected to the hose.

Don't use a garden hose as may let air into the system. Only need to open up manifold to flush it out.

Run the hose before connecting and shouldn’t be any issue with air.

you can also just open the bleed valve the following day to bleed off any air that may get trapped plus on the pics he has an auto bleed valve the hot side above the red shut off.

At 21 yes. It was 34kwh yesterday, didn't get above zero here all day. I happy enough with that, considering the day. Will probably be under 30 today, but not by much.

.

Looking at it again, I'd say I was a bit higher yesterday. Maybe 38kwh, it's hard on mine to figure out what goes to DHW.

I’ve noticed that the lack of wind has made a huge difference. I don’t know about your guys houses; but mine is a long way from airtight. Dormer bungalow with unfilled cavity’s and old leaky double glazed windows.

Im still a long way off a heat pump; but I have my oil boilers stat turned down to the minimum; which is 50C flow. Usually this would not be sufficient to keep the largest room (the kitchen) at 20-21c; but over the last 3-4 days the kitchen has been lovely and warm. I’m in Tullamore; so it’s been -1 to -3 at nights.

In these conditions I have been using about 100kwh of heat per day. So if I got a COP of 3.5 that would be about 28kwh of electricity. Which would be about 9 euro at 33 cent per unit, and kerosene is about 1.10 per L; so even with a really poorly insulated house it seems it would be slightly Cheeper with the heat pump. Now is it reasonable to get a COP of 3.5 at a 50C flow; prob not.

If I could get a 20kwh dedicated battery for the ASHP and charge it at cheep rate; it would only cost 3 euro a day.

Think I need to keep ploughing money into improving the insulation and air tightness…..

That’s IF I was supplying the energy via a heat pump (with a 3.5COP) as opposed to the oil boiler which is currently using 10L (about 100kwh).

so would you guys be happy with 300 euro a month on heating in Dec and Jan? Or is that too much?

You're making me feel a bit better lads.

My 193m2 bungalow has used between January 1st to 4th an average of 38kWh per day. I got 70 rolls of mineral wool insulation delivered just before Christmas in the hope of taking the pressure off the heat pump but of course I pulled a muscle in my back with only 8 rolled out.

It currently sounds like there's a Cessna readying for take off outside my back door.

Yeah, that's just heating. 33kwh for heating yesterday.

Is that 14c flow temp? And only on between 23:00 - 08:00?

Thats very impressive. The house is clearly very well built. Do you have solar?

So it was running at an average of about 1.4kW, and yesterday was a cold one

I pay 33c on my day rate so even if all of that was on the day rate (which it wouldn't be) that's a tenner for a days heat. Not auful at all