Jan Rosenow
@janrosenow.bsky.social
Professor of Energy & Climate Policy at University of Oxford
Energy Programme Leader at ECI, University of Oxford
Senior Research Fellow at Oriel College, Oxford
Senior Associate Institute for Sustainability Leadership, University of Cambridge
Energy Programme Leader at ECI, University of Oxford
Senior Research Fellow at Oriel College, Oxford
Senior Associate Institute for Sustainability Leadership, University of Cambridge
I’m sorry to confuse you.
November 21, 2025 at 1:52 PM
I’m sorry to confuse you.
Financially yes that’s often true. From a carbon perspective the sooner you replace a fossil fuel heating system the better. More in linked article.
November 21, 2025 at 1:52 PM
Financially yes that’s often true. From a carbon perspective the sooner you replace a fossil fuel heating system the better. More in linked article.
No they are not. In situ field studies found an average condensing boiler efficiency of just 83% in the UK and most condensing boilers never condense because of the high flow temperatures.
November 21, 2025 at 1:51 PM
No they are not. In situ field studies found an average condensing boiler efficiency of just 83% in the UK and most condensing boilers never condense because of the high flow temperatures.
You saying that doesn’t make it true. The graph I shared is based on the best available data set on global renewable energy capacity. You’re just spreading conspiracy theories.
November 21, 2025 at 1:49 PM
You saying that doesn’t make it true. The graph I shared is based on the best available data set on global renewable energy capacity. You’re just spreading conspiracy theories.
Once it breaks down you would consider what to replace it with though. And why would I pay you money to do that???
November 21, 2025 at 1:48 PM
Once it breaks down you would consider what to replace it with though. And why would I pay you money to do that???
It is true that China builds by far the most renewables in the world. It is also true that they built most coal plants. And it is also true that power system emissions are beginning to fall for the first time.
November 21, 2025 at 1:43 PM
It is true that China builds by far the most renewables in the world. It is also true that they built most coal plants. And it is also true that power system emissions are beginning to fall for the first time.
A gas boiler doesn’t run at 100% efficiency. That’s why factor 4.
November 21, 2025 at 1:41 PM
A gas boiler doesn’t run at 100% efficiency. That’s why factor 4.
But a fossil fuel heating system is not free either.
November 21, 2025 at 1:40 PM
But a fossil fuel heating system is not free either.
Is 2k for air to air an absolute fortune?
November 21, 2025 at 1:34 PM
Is 2k for air to air an absolute fortune?
You find most of my posts are without errors but some of them aren’t.
November 21, 2025 at 1:31 PM
You find most of my posts are without errors but some of them aren’t.
Your information is out of date. Read the article.
November 21, 2025 at 1:30 PM
Your information is out of date. Read the article.
and you suggest we do this in Northern Europe too where most heat pumps get installed?
November 21, 2025 at 12:55 PM
and you suggest we do this in Northern Europe too where most heat pumps get installed?
The average SCoP of the installs on the website I shared is around 3.9. That includes a very wide range of homes, old and new, well and poorly insulated.
November 21, 2025 at 12:54 PM
The average SCoP of the installs on the website I shared is around 3.9. That includes a very wide range of homes, old and new, well and poorly insulated.
An argument I have made already in 2019.
November 21, 2025 at 12:04 PM
An argument I have made already in 2019.
It’s intentional I suspect or account believes in the usual nonsense peddled by folks on X.
November 21, 2025 at 11:47 AM
It’s intentional I suspect or account believes in the usual nonsense peddled by folks on X.
But…but where does all the heat end up after heating the house?
November 21, 2025 at 11:46 AM
But…but where does all the heat end up after heating the house?
Why don’t you look at the real world data here and tell me what the average SCoP (efficiency) is? heatpumpmonitor.org
HeatpumpMonitor.org - Heat Pump Performance Data
An open-source initiative to share and compare heat pump performance data. Join our community of heat pump owners sharing real-world performance data.
heatpumpmonitor.org
November 21, 2025 at 11:44 AM
Why don’t you look at the real world data here and tell me what the average SCoP (efficiency) is? heatpumpmonitor.org
So you don’t have a heating system?
November 21, 2025 at 11:42 AM
So you don’t have a heating system?
Just leaving this here in anticipation of the usual comments. www.carbonbrief.org/factcheck-18...
Factcheck: 18 misleading myths about heat pumps
Carbon Brief factchecks 18 of the most common and persistent myths about heat pumps
www.carbonbrief.org
November 21, 2025 at 10:52 AM
Just leaving this here in anticipation of the usual comments. www.carbonbrief.org/factcheck-18...
Where’s the source to back this up? LCA analysis says otherwise.
November 21, 2025 at 7:07 AM
Where’s the source to back this up? LCA analysis says otherwise.