Icy cold weather, weather compensation and consumption
Is the BUH used during defrost cycles, had 7kw pulling yesterday morning at 7am.
@gary hello again Gary. Now running heat pump at 32c and finding that the 3rd party room stats are now switching off the ecodan at 22c. Is that any different to the cycling that occurs when the heat pump is controlling the flow temp?
Outside temp is warmer today +4 instead of -3
Before you were cycling every 20 mins has thst now stopped at 32C. If the temp doesnt drop so that the thermostat turns it back on in 20 mins then it will be cycling less. You could try 30C and check if the cycling comes back. It’s unlikely you will ever find the perfect setting. Mine is running at 32C has been since 12pm and the temp has changed from 21C to 22C but in the time the heat pump hasn’t cycled once. Here is an hour from this afternoon
Well, that was an expensive weekend, certainly. OAT varied between 0 and -9°C over Sat/Sun, with heating (exc. DHW) consumption of 52.8 and 54.4 kWh respectively.
Made for some nice outlier points on my charts though...
(NB: all CoP figures are Vaillant's self-reported figures, as I don't have any better monitoring at present.)
Looking forward to trying out Octopus Cosy (which I've calculated ought to help with the cost a reasonable amount), and all the more to our battery and solar installation in due course (hurry up, SSE!).
@josephiah We are using Cosy; the overnight 12 hours before the next 3 hour cheap rate is the greater challenge though. We have 27 kW/h of storage battery (2 x Powerwall 2’s) and I am trying not to draw from the grid outside of these 6 hours per day. We came rather close to having to use a little grid power between about 02:00 and 04:00 when the temperature went below 0 degrees at the week end. We just scraped by however, don’t want none of those freezing temperatures ‘round ‘ere, not no how thanks! Regards, Toodles.
Toodles, he heats his home with cold draughts and cooks his food with magnets.
@toodles thanks, interesting to hear. I'm not expecting to be able to shift all of our demand into the cheap periods, by any means, but should be able to start making a small dent as soon as my Cosy switch happens, followed by a more sizeable one once our battery gets installed.
Also have a large delivery of supplies coming this week to give the loft insulation a boost. Would have be been lovely to have all of this in place before this winter, but hey ho, will keep chipping away!
Cheers,
Jo
@josephiah The best time to have installed renewable energy projects is always ‘Last Year’! 😄 Regards, Toodles.
Toodles, he heats his home with cold draughts and cooks his food with magnets.
@toodles Quite. I'd first looked at all this seriously back in 2021, but then life got busy and I didn't follow through - man, I was kicking myself last winter. I guess a more positive spin would be that last winter finally kicked me into action!
@josephiah I first started researching the whole subject of ‘going green’ back in the dark cold months at the end of 2020 and well into 2021. I wanted to ‘go solar’ first but of course, I first needed to consider any improvements to insulation thus had Q-Bot underfloor insulation downstairs and at the end of this work looked into increasing loft insulation to 300 mm+ in the autumn of 2021.
PV took months to sort (about 9) before installation in July-Aug. 2022 and had to wait until November of that year for the first Powerwall. The ASHP was ordered in Dec 2022 and installed mid-February 2023; a few months later, I had the second Powerwall added. I have been supplied by Octopus Energy since July 2022 and not regretted it at all!
I checked the last week’s consumption up to last night and the daily average over that week works out to be 45.45 kW/h. With care, I can use the battery capacity to ‘download’ at cheap rate and eek it out without reversion to any higher rate energy. From this, I would reckon my daily consumption for heating + DHW heating plus all domestic needs is costing me approx. £7.50 plus the despicable standing charge of course! No gas so that’s it in total. Not much solar energy from the 8.1 kWp. array at present but this will be sold back when any surplus shows up. Regards, Toodles.
Toodles, he heats his home with cold draughts and cooks his food with magnets.
My 9kW Cool Energy (SPRSUN) has been coping admirably this last week.
Rads in the old part of the house, ufh in the 15m2 extension. Weather comp curve 37@15, 48@0…. No buffer, no separation, no thermostat.
Our very worse day was 56kWh for the whole house, and that included 1.5 charges of my ampera and four loads od laundry.
House is warmer than it was before, and it doesn’t cost any more.
Off grid on the isle of purbeck
2.4kW solar, 15kWh Seplos Mason, Outback power systems 3kW inverter/charger, solid fuel heating with air/air for shoulder months, 10 acres of heathland/woods.
My wife’s house: 1946 3 bed end of terrace in Somerset, ASHP with rads + UFH, triple glazed, retrofit IWI in troublesome rooms, small rear extension.
- 21 Forums
- 1,977 Topics
- 43.1 K Posts
- 44 Online
- 2,305 Members
Join Us!
Heat Pump Dramas?
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.
✅ Pre-Installation Planning
✅ Post-Installation Troubleshooting
✅ Performance Optimisation
✅ Complaint Support (Manufacturer & Installer)
Latest Posts
-
@sandman1600 how many loops on that one?
By davidnolan22 , 13 minutes ago
-
RE: Volumisers in Heat Pump Systems: Does Placement Matter?
@abernyte no, it doesn’t turn the pumps off on mine.
By davidnolan22 , 33 minutes ago
-
RE: Confused about Samsung Gen6 Hot Water Controller
Do you have the DHW on timed periods or on continuous w...
By DerekDeLeon , 10 hours ago
-
RE: What is the best strategy for operating a very oversized heat pump?
I think we are currently operating a weird mix of 2 and...
By guthrie , 12 hours ago
-
We’ve had our heat pump (EBAC) since October, with a fe...
By Simon and Zoe , 13 hours ago
-
RE: DHW temp Samsung AE120RXYDEG 12kw ASHP with Gen 6 controller
@Bami Ive had a look for the specs of your cylinder o...
By bontwoody , 14 hours ago
-
RE: best approach for primaries?
Personally I would want them inside the heated envelope...
By JamesPa , 17 hours ago
-
RE: help with new bathroom and towel radiator
I persuaded my installer that heat loss from the adjace...
By JamesPa , 17 hours ago
-
RE: Grant Aerona fine tuning advice needed
Thank you pretty sure it's solar gain causing the incre...
By Stopbar , 18 hours ago
-
-
RE: Heat Pump Servicing & Maintenance – Good Value or Rip-Off?
I fitted a Samsung 8kw myself on a new build with under...
By DerekDeLeon , 21 hours ago
-
RE: Who's your electricity provider and what's your tariff?
@adrian it does look like they’ve updated their outgoin...
By Arundalep , 2 days ago
-
RE: Heat Pump Sizing & Installation Costs
1970s 4-bed detached house approx 168 sq.m internal are...
By JohnR , 2 days ago
-
RE: Is it KISS or constant – weather compensation vs. set flow temperature?
Away at present. Hence the delay. Will get back asap. ...
By cliffhanger , 2 days ago
-
RE: Setback savings - fact or fiction?
The lower the DT the higher the flow rate. The lower ...
By BobTSkutter , 3 days ago
-
RE: New kitchen with no walls – will fan coil units work?
Thanks. That explains the strangely-shaped 'feet' (loo...
By IanMK13 , 3 days ago
-
RE: Heat Pump Books For Beginners – Bodge Buster & From Zero To Heat Pump Hero
I’ve updated Bodge Buster for 2025 to empower homeowner...
By Mars , 3 days ago
-
RE: Aira Heat Pump: Stylish Scandinavian Heating
Aira, the Swedish, end to end manufacturer, system desi...
By KevinPotts , 3 days ago
-
Unfortunately for your argument the best performing Dai...
By RobS , 3 days ago
-
RE: Grant ASHP not reaching target temperatures
@mikefl Thank you. I’m not sure how to do these checks ...
By Hillswick , 4 days ago
Latest Topics
-
Confused about Samsung Gen6 Hot Water Controller
By ntruby 10 hours ago
-
help with new bathroom and towel radiator
By AdamK 21 hours ago
-
Grant Aerona fine tuning advice needed
By Stopbar 1 day ago
-
Adjusting 6kW Daikin's Weather Compensation Curve
By Ubert767 5 days ago
-
Should I make my radiators smaller?
By Scalextrix 6 days ago