You don't have to be Einstein to know that cold water has a cooling effect, though I am very pleased to see that research is being carried out to quantify how much of an effect it does have.
Now they need to investigate coatings that reduce the heat loss, or ways to prevent the water getting onto the walls and windows in the first place. We are fortunate to have quite wide soffit boards along the sides of our bungalow, so it would have to be blowing a gale for rain to reach the brickwork.
@derek-m thanks for this, I didn't know the inverter could give us that data. I've mapped out each day now since January 1st, and have a view of our average kWh generated via the panels per month, considering how rubbish the weather was in May, its not surprising its lower than April - tho the bank holiday was ace. We have 8 panels, just a small 2W system, yep they are south facing.
@mars - I see above you mentioning reducing the flow rate, is this the hot water tank temp?
This winter and spring has been a lot colder than last year, and it's really interesting to see the correlation between ambient temperature and ASHP consumption.
Our next step in this journey is to now drop our consumption. The new K3s have definitely addressed our cold rooms, and everything is now coming to temperature. I think that we'll try and drop the flow rate to 40C, and see if that helps.
I dropped ours to 40C on May25, 2021, but the outside temperatures have gone up and I haven't seen a considerable difference, but let's see what happens.
Very interesting. Our usage pattern is similar, but 55-60% of yours. Probably down to relative house sizes as we're not jumper people either! I also haven't made any adjustments yet; my system is still set up as it was installed with 50 deg flow and weather compensation.
Looking at your monthly figures on myhomefarm, I'm quite encouraged. If I use your winter monthly pattern and my April/May numbers, my likely winter kWh consumption is definitely something I could live with and a lot less than the old storage heaters both in terms of money and CO2.
As a test you could try removing the 5am to 7am water heating schedule and see what difference it makes to your electricity consumption and supply of hot water.
Mars was referring to the water flow temperature, which is the temperature of the water coming from the ASHP. You should try to operate your ASHP with the lowest temperature setting, since this improves the overall efficiency of the system.
It would be interesting to see how well the weather compensation works. On your system does it show the actual water flow temperature? If the weather compensation is functioning, it should have lowered the water flow temperature from the initial 50C, down to probably the mid to low 30's. Obviously, you may have to get up around 4am when your ASHP may be running, but that's okay since I don't have a problem with that. 😍
Maybe it’s just us hardy Midlanders, 😋 but surely your ASHP heating is off now. For the summer? Mine is also off for hot water, as I have solar PV. But I could understand why others need the ASHP running for hot water demand. I called Daikin support to ask what the standby electric usage was for my HP. They didn’t know specifically 😳, but said it was low. Meaning a kW or 2 a day to keep the compressor functioning. I’m keeping an eye on the meter usage
Daikin Altherma 3H HT 12kWh ASHP with Mixergy h/w cylinder; 4kW solar PV with Solic 200 electric diverter; Honda e and new Hyundai Ioniq 5 N electric vehicles with Myenergi Zappi mk1 charger
It's set to 21 degrees morning/evening so has been off for a couple of days now but will come on in the morning if it's cooler at night. I might re-think whether we can live with it a degree or two less.
Haha @kev-m. 21C. You need to wear a wool jumper 😂
But you are right, different parts of the country at different temperatures
We are lucky to get quite a bit of solar gain. Which we can also manage quite well.
Plus chasing Mrs J around the house keeps us warm 😉
Daikin Altherma 3H HT 12kWh ASHP with Mixergy h/w cylinder; 4kW solar PV with Solic 200 electric diverter; Honda e and new Hyundai Ioniq 5 N electric vehicles with Myenergi Zappi mk1 charger
With this product, I assume it still only diverts the excess to the water tank. i.e. on a sunny day, the solar let's say would be providing the power for the dishwasher, and then any excess would be diverted to the hot water tank?
It wouldn't divert all the power to the hot water tank, bypassing powering the dishwasher, right?
Maybe it’s just us hardy Midlanders, 😋 but surely your ASHP heating is off now. For the summer? Mine is also off for hot water, as I have solar PV. But I could understand why others need the ASHP running for hot water demand. I called Daikin support to ask what the standby electric usage was for my HP. They didn’t know specifically 😳, but said it was low. Meaning a kW or 2 a day to keep the compressor functioning. I’m keeping an eye on the meter usage
Our heating was still coming in the early hours of the morning last week, so we've just switched it off at the panel now. Hot water is being exclusively reheated by solar PV via the iBoost. As a result our electricity consumption has plummeted. 2021 has been a heavy year.
Thinking about installing a heat pump but unsure where to start? Already have one but it’s not performing as expected? Or are you locked in a frustrating dispute with an installer or manufacturer? We’re here to help.
