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Hi all,
I mentioned in a post that we've had a heat pump installed and I got a DM from a curious member about how it performs in cold weather.
Since I looked up the data to write them a response I thought I would share it with the group!
The Vaillant Heat Pump app provides us with data. I don't know how reliable it is but it seems plausible.
The efficiency does seem to reduce (as expected) when the temperature drops. It has to work harder and there is less heat available.
Our install was by the Heat Geeks and they are really the gold standard for efficiency calculations so that you use the minimal amount of electricity to achieve your heat requirements.
Monthly data
So far for January it reports 434%
December we got 481% (but we were away for several days over Xmas so had it on a lower temperature output which was very efficient)
November it was 483% (only the second half of the month, since commissioning)
Anything above about 360% should be cheaper than gas, but ours mostly runs off the battery which we fill up at 8.5p.
Daily data
Today where it started very cold (about zero until noon) it is reporting 431%.
Lowest day was yesterday 401%, but we might have lower efficiency this evening when the sun goes down.
Caveats
That may just be the heating efficiency, and the hot water efficiency (if not included as I suspect) will be lower. But, the hot water efficiency will still be much higher than the immersion heater we were using last winter to reduce our gas burn.
Also - During install Pebbles described herself as a 'victim of climate change' because there would be a big box taking up space on our decking.
Comfort improvements
The heat pump runs 24 hours a day (set back to 18 when it isn't on 21 degrees).
Since we are both home (and at least one of us it) most of the time it is much better for us.
We haven't had to use our oodies so far, which we usually have in the past when the temperature drops!
Thoughts?
I don't know if anyone has any other questions about them but we've been very pleasantly surprised.
For me it is all about the carbon savings - which will be substantial - but I've been very impressed with the efficiency and so the cost will be very reasonable too (especially with our battery and solar and EV tariff).
I mentioned in a post that we've had a heat pump installed and I got a DM from a curious member about how it performs in cold weather.
Since I looked up the data to write them a response I thought I would share it with the group!
The Vaillant Heat Pump app provides us with data. I don't know how reliable it is but it seems plausible.
The efficiency does seem to reduce (as expected) when the temperature drops. It has to work harder and there is less heat available.
Our install was by the Heat Geeks and they are really the gold standard for efficiency calculations so that you use the minimal amount of electricity to achieve your heat requirements.
Monthly data
So far for January it reports 434%
December we got 481% (but we were away for several days over Xmas so had it on a lower temperature output which was very efficient)
November it was 483% (only the second half of the month, since commissioning)
Anything above about 360% should be cheaper than gas, but ours mostly runs off the battery which we fill up at 8.5p.
Daily data
Today where it started very cold (about zero until noon) it is reporting 431%.
Lowest day was yesterday 401%, but we might have lower efficiency this evening when the sun goes down.
Caveats
That may just be the heating efficiency, and the hot water efficiency (if not included as I suspect) will be lower. But, the hot water efficiency will still be much higher than the immersion heater we were using last winter to reduce our gas burn.
Also - During install Pebbles described herself as a 'victim of climate change' because there would be a big box taking up space on our decking.
Comfort improvements
The heat pump runs 24 hours a day (set back to 18 when it isn't on 21 degrees).
Since we are both home (and at least one of us it) most of the time it is much better for us.
We haven't had to use our oodies so far, which we usually have in the past when the temperature drops!
Thoughts?
I don't know if anyone has any other questions about them but we've been very pleasantly surprised.
For me it is all about the carbon savings - which will be substantial - but I've been very impressed with the efficiency and so the cost will be very reasonable too (especially with our battery and solar and EV tariff).
