Performance in the current cold snap…
How is everyone’s system performing in this current cold snap?
Just curious to see if everyone is happy with their comfort and running costs, given that we are now well into ‘design conditions’ for the heat loss calcs.
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.
180sqm detached house built in 2000 so insulation isn't bad but isn't great either, 8.5KW Ecodan, UHF downstairs retrofitted so little thermal mass, Rads upstairs.
Design Temp was std 50°C at -2°C.
Really managed to dial in the WC curve this winter currently set at 32°C flow at 3°C and above any lower flow temp leads to awful cycling even with everything run as a single zone.
Ecodan can't modulate down any further.
Bottom end of curve set at 45°C at -10C.
Currently, its -5°C and flow temp is running at 40°C house is steady at 21.5°C downstairs, 20°C upstairs
I don't setback overnight its just not worth it during the winter, so the heat pumps runs space heating continually apart from an hour for DHW overnight.
Yesterday being the coldest so far the heat pump used around 40kwh, the past week has been between 30-40kwh depending on OAT.
Running costs if I was on a std tariff then heating in Dec would have cost £150. Jan will probably be over £200 over the year I think it would be on a par with gas prices.
Midea 14kW (for now...) ASHP heating both building and DHW
@cathoderay are you warm enough though?
We are on the backstop rate and we’re running about £70-85/week in electric at the moment.
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.
@hughf - yes and no. Yes if I put on extra layers of clothing, no if I don't. I'm old enough to remember getting dressed in bed as a child as we had minimal heating in those days, I just view the current inconvenience as one of those things.
Midea 14kW (for now...) ASHP heating both building and DHW
I'm lovely and warm (22 degC +/- 0.5) but the bills are going to hurt. On track for £210 this month. Still cheaper than a modern gas boiler overall, but the very coldest past few days are individually worse than gas. What I'd give for a Passivhaus!
ASHP: Mitsubishi Ecodan 8.5kW
PV: 5.2kWp
Battery: 8.2kWh
@scrchngwsl bargain…. 🤣
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.
House-2 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60
This past month has been cold. My weather station says the average temperature in the past 30 days is 1C. In that period I have been averaging electricity costs of £9/day to keep 180 square metre, timber frame exposed location house at 19/20C. I do set back for 6 hours at night to 15C and recovery is within an hour if not too sub zero and two hours if minus 3/4 C.
Flow temps rarely get above 36C and large K2/3 rads just warm to touch. All in all very satisfied with 14kW Ecodan.
Down to -6 last night. Yesterday running fixed flow@31 deg I used 29kwh for heating/dhw. Kitchen 22, othere areas 21/20. Running 9am-11pm. Very happy compared to up to 60kwh some days my first winter ,zoned with installer settings wc.242sqm ufh.
@cathoderay quite a lot of short cycling there, have you managed to put your finger on the cause?
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.
- 26 Forums
- 2,197 Topics
- 48.4 K Posts
- 38 Online
- 5,854 Members
Join Us!
Podcast Picks
Latest Posts
-
RE: Heat pump and wifi kit connection.
Wi-Fi kit covers any Samsung device that has a modem in...
By Alfapat , 3 hours ago
-
RE: How to Understand Wiring Up a Heat Pump
I’m watched @pirate-rich rewire our wiring centre last ...
By Mars , 4 hours ago
-
RE: Heat Pump Installers: Competence, Illusion and the Hard Truth Homeowners Must Face
We’re going to do a full retrofix in spring with @pirat...
By Mars , 4 hours ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
@agentgeorge err… Pass! I dunno what caused that! I’ll ...
By Toodles , 4 hours ago
-
RE: Sizing - Save me from my headache
If you get an R290 pump you should be able to heat the ...
By JamesPa , 4 hours ago
-
RE: Help me keep the faith with my air source heat pump installation
@jamespa can you take a pic of the primaries inside the...
By AdamK , 5 hours ago
-
RE: Large heat pump options for church building
@aventus-eco Thanks Sean, will drop you a line.
By Josephiah , 5 hours ago
-
RE: Moving FIT array onto a Tesla Powerwall 3 possible?
@toodles that’s good news for @adamk
By Judith , 6 hours ago
-
@drei do you mean running block average, so 6months bef...
By Judith , 6 hours ago
-
RE: Samsung Gen 6 - Schedules not working
@technogeek That sounds very logical :-). I will give i...
By bontwoody , 9 hours ago
-
RE: Who's your electricity provider and what's your tariff?
Considering Octopus states all their electricity is gre...
By AgentGeorge , 9 hours ago
-
RE: Heat Pump + Tado Setup: Smarter Control for Secondary Pumps?
@pirate-rich thanks for the reply. If I were to explo...
By Lloydi , 10 hours ago
-
RE: Seal the Deal: Don't Let Your Heat Pump Leak Energy
@transparent I think the committee might get into some ...
By Toodles , 11 hours ago
-
Samsung ASHP Support in Midlands area?
Hi all, Per title.... can anyone recommend a ASHP ser...
By Andehh , 11 hours ago
-
RE: Why Air Release Valves and Deaerators are Non-Negotiable
When I had my system serviced recently, I asked the guy...
By Old_Scientist , 14 hours ago
-
May I present the maths I referred to earlier when disc...
By Transparent , 14 hours ago
-
RE: RDSAP10 effect on existing heat pump EPC rating?
How many times and dates have epc sap rules been change...
By Tim441 , 14 hours ago
-
RE: Rodents! A word of warning for heat pump owners
I think similar care should be taken against vermin ing...
By Transparent , 15 hours ago