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Heat Pumps - post here.
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I've changed my heating strategy in the last 2 months since I moved to a new smart meter tariff, so I have been looking at my HP consumption closely recently. As you can see, the difference between 2023 and this year is stark, but I put this down to the very mild weather heating only coming a week or two ago!!.
Up to now, I have just been letting the HP call for heat and hot water as it needs it, so every time I had a shower, it would come on and top it up. If one room needs heat, the HP would come on and heat that room and only that room. I'm in a new build; it's an A1 house with underfloor heating upstairs and downstairs, and I have 12 zones!
I am lucky also that I have a 300-liter buffer tank, so I have plenty of hot water storage, so I delay heating the hot water to 2 am and shut it off at 8 am. I give it another boost at 2 pm when hopefully, there will be Solar PV, but then nothing until 2 am where it heats at 6.33 cents/kWh.
I have now started in the past 2 weeks is timing the heating to come on at 03:30 am until 5 am and set all the temp stats to a high value, so in effect, I have one zone. My thoughts are to use the thermal mass of the house to retain the heat, and if the HP is on, it may as well be on for the whole house, not just one room. From looking at The Heat Geek guy, it seems this is the most efficient way to do it anyway.
It seems to be working away great; the house temps are steady, and no one is complaining. Now with the weather in the low digits, I have timed the whole house to come on at 7 pm for an hour or two, just to give it another top-up for the evening. Again, artificially setting all the stats to a high enough temp, they all come on.
Ill keep ye posted on how I get on all winter
6.1kWp south facing, South of Cork City
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temperature in the house is 22 degrees (some stats in smaller rooms read 22.5) as that's what herself likes. i'm grand with it.
it was a self build project, built to passive house standards. 193m2 (~2,100sqft) bungalow. 8kw thermia ASHP, flow rate is either 28.5 or 30 degrees (the lower figure is in brackets which i think is the temp it returns to the ASHP at).
like @newhouse87 I employ an open loop type setup and have done so since the heat pump was commissioned. even though the heat pump has upped its effort over the past three days i'm more than happy with the kWh figures i'm seeing. i have had no need to adjust the heat pump since last winter, it just does its own thing which is great and something i had not expected.
hot water is heated whenever the temperature drops below the 40 degree set point so it can come on at any time but its very quick at bringing the water back up to 50 degrees. legionella cycle runs once a week on a saturday night.
there's a lot to be said for airtightness and high levels of insulation.
Post edited by Exiled Rebel on2 -
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Mitsubishi Srk 50 zs-wf air to air heat pump. 3 story, 1400 sq ft. Heat pump is on the ground floor, really have to ramp up the temperature at the moment to get the heat upstairs. Will be fitting another unit upstairs soon. Upstairs temps, 20.5. Downstairs 22.5.
☀️
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Consumption for our bungalow 165m2 which has had several upgrades including triple glazed windows, walls pumped and I have bumped up the roof insulation to about 300mm.
HLI is 1.7 and I calculated heat loss a few different ways and all very similar at about 6800-7000w
This runs 24/7 and covers heating and hot water to 47°C once a day in a 250l cylinder. I used to leave the water to heat whenever the temp dropped 3° below set temp but changed about a week ago to once overnight on the cheap EV rate. I also turned off the legionella cycle about a week ago also, this ran once a week.
Run it at three temp settings with a set back of 2° between 22:00 and 04:30 and boost of 2° at 04:30 to 06:00 on the cheap EV rate.
Temp of house varies from about 19-19.8° which we are happy with.
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