Well-installed heat pumps installed in the UK today achieve on average a 64% higher efficiency than those during the early trials 15 years ago. It is testament to the brilliant installers and to the technology getting better. More in our recent paper: www.sciencedirect.com/science/arti...

I have been notified that the video link to my Helsinki talk does not work for some people. Here's an alternative link for those who prefer a YouTube version: youtu.be/D2abyXGvELI

Let’s see what we can learn from temperature change in the next two years – mailchi.mp/caa/global-t... Also available on Substack: jimehansen.substack.com/.../global-t....

Based on the 11-year running mean (and on Earth's Energy Imbalance), the near-term rate of warming could turn out much higher than the linear 2010-2025 extrapolation. The next El Niño peak will be very informative for the rate of global warming, as @drjamesehansen.bsky.social points out:

Massive thanks to @trystanlea.bsky.social and @glynhudson.bsky.social for setting up HeatPumpMonitor.org, the excellent installers and to the people willing to share their data! Without you none of this would have been possible.

It's been great to be part of this project with @janrosenow.bsky.social @trystanlea.bsky.social to share the results from HeatpumpMonitor.org @openenergymon.bsky.social in a peer-reviewed paper 🥳 The overall highlighted HP performance is testament to the work of excellent installers 👏 🎉

NEW RESEARCH: UK heat pumps can perform far better than many think. Our analysis of HeatPumpMonitor.org data shows well-designed systems achieve ~40% higher efficiency than past trials (SCoP 3.86 vs 2.81), cutting bills (~£224/yr) and emissions. Open access: www.sciencedirect.com/science/arti...

Big thanks to TBarton Electrical for doing an excellent job installing the solar and battery system, they've been great to work with tbartonelectrical.co.uk

It's been great to be part of this project. While most of the work is credit to Chris from Griffith's heating, Glyn and I did the heatloss calc and are involved in commissioning, optimisation and monitoring of course

When I was getting our heat pump here, because of the twitter heatpump discourse, I was worried that our model was oversized, but found in practice that it actually performs very well! (It's well within @openenergymon.bsky.social's range of useful oversizing).

Heat pumps are running! Still lots of tweaking and tidying to do but building is heating up 😁

30kW SolarEdge PV and 65kWh of GivEnergy Commercial battey system is now up and running, with @openenergymon.bsky.social monitoring 😀

We've written up the main findings from HeatpumpMonitor.org so far here docs.openenergymonitor.org/heatpumpmoni..., presenting this tomorrow at the DESNZ/IEA heatpump research seminar 🤓

Solar PV install is coming along, only another 43 panels to go! 🥵⚡

I really enjoyed this episode of the @TransitionShow.mastodon.energy.ap.brid.gy podcast with @richardlowes.bsky.social, thanks for the @openenergymon.bsky.social heatpumpmonitor.org mention, "brings an element of fun into heatpumps" 😁

Here's a video about an interesting ASHP installation I was involved with in a solid stone cottage, the combination of insulation, air tightness, UFH and MVHR has made for a very efficient low-cost heating system with a SCOP of 5.1 for space heating 😀 📈 youtu.be/YouOLThHSNk?...

This is part of a big electrification and decarbonisation project for the building to remove deoendancy on LPG, reduce running costs and increase energy security; this will involve 2x 16kW Viessmann ASHP cascade, 69kWh of GivEnergy storage, 30kW of PV and @openenergymon.bsky.social monitoring 😀

More panels going up! Only 60 more to go 😅

I've been helping out on a solar PV installation on our @Openenergymon shared office space, it will be a 30kW SolarEdge array! Today we fitted the rails and got the first couple of panels in place 😁

This Skill Builder heatpump now one of the best performing systems in the country thanks to a Heat Geek transformation! Here's the live and historic data monitored independently by @openenergymon.bsky.social 👏 heatpumpmonitor.org/system/view?...

Big update incoming for OpenVehicles (OVMS) Android app 😍

Interesting podcast about the Electrification Of Heat government heat pump trial results with Katrina Young from @energysyscat.bsky.social and @trystanlea.bsky.social from @openenergymon.bsky.social

Current issues with heatpump installations: good write up by @trystanlea.bsky.social on the @openenergymon.bsky.social forums community.openenergymonitor.org/t/over-sized...

It’s 4C outside and the ASHP is nearly hitting a COP of 5 😍😍😍 It’s been running continuously since 1320 yesterday despite there being mist and high humidity! #HeatPumpsWork!

16) the UK arguably has Europe's best example of such initiative with @trystanlea.bsky.social's heatpumpmonitor.org which @adambell.bsky.social's heating engineer uses and @madgabes.bsky.social watches. Finland hasn't a patch on this initiative😉 I discuss it here open.spotify.com/episode/3RAm...

I've been on the tools this week with @trystanlea.bsky.social retrofitting a heat meter and re-wiring to fit a Homley controller to this 3yr old Grant heat pump, COP efficiency should be considerably improved, will report back...

*eyes water*

BEST PERFORMING HEAT PUMP in UK costs 3.8 pence per kWh to heat an older property (with solid brick walls) just using radiators. If the system was to use the @ovoenergy.bsky.social plus tarrif it would only cost 2.99 pence per kWh You can hear about it on the BetaTalk podcast

We've got a full year of monitoring for heating & hot water in our #Passivhaus EnerPHit retrofit. Our total electricity usage, for heating and hot water, between 14th November 2023 and 14th November 2024 was just £175!

Yes that'll be needed to match and smooth it out hour by hour @trystanlea.bsky.social has done some more detailed analysis including battery and gas back up here. Probably a 9kWh battery is enough? trystanlea.org.uk/communityene...

Article w/ @euronion42.bsky.social looking at using methanol for long duration energy storage is out of the paywall! Liquids = ultimate resilience. Openly accessible from now until forever. doi.org/10.1016/j.jo... More thoughts on methanol below...

Test results are one thing, but how do heat pumps work in reality? Really well in most cases, according to the live heat pump performance data on www.heatpumpmonitor.org, a website from the good folks at @openenergymon.bsky.social.

Oh hold on, wait. It's open source. We offer **everyone** a free licence for PyPSA. That's the point. Everyone, regardless of background and means, should be able to model the transformation of their energy systems, see what the code is doing, and modify it if need be. github.com/pypsa/pypsa

Heat pump starter pack just dropped. go.bsky.app/KCLxmj9

Here's an @openenergymonitor.bsky.social form thread on this topic community.openenergymonitor.org/t/vaillant-m...

This evening I've been doing some max output testing with a Vaillant 5kW ASHP, at 0C with 45C flow Vaillant claim an output of 6.6kW is possible, however in real world taking into account defrosts it only managed to output 5.3kW, which is 80% of the stated output

A friend has used 40kWh of gas today to heat their house to an average temp of 19C which works out about 9.9kg of CO2 in emissions. Electricity in the NE is 7g CO2e/kWh today. Meaning to maintain our house at 21C today has cost 39.2g CO2e. It’s insane how much an #ASHP would reduce CO2 emissions.

On long duration storage, I'd give a shout out to the Royal Society report on this topic, that addresses the often played, perceived 'gotcha' card of a dunkelflaute. Oh, but we can deal with that too. royalsociety.org/news-resourc...

Woods were looking rather romantic this morning

I wrote about his efforts, and the work of other "SCOP-chasers" back in July for Wired: www.wired.com/story/heat-p...

Last month, heat pump installer Damon Blakemore hit a major goal: one of his installations clocked a seasonal coefficient of performance (SCOP) of 5. That means a 12-month average of 5kW heat for every 1kW electricity the device used. The first air source heat pump to do so on heatpumpmonitor.org.

If you're thinking that maybe a heat pump is for you, here is real-world data from people's houses, showing actual performance in our climate. It helps when people say, "heat pumps don't work where we are".

For context, this means these heat pumps are running at an average of *390% efficiency*, and there’s a load of systems running at even higher efficiencies than that. (this is possible because heat pumps work by concentrating free diluted heat, even freezing temps, from the environment)

How well can heat pumps work when designed, installed and commissioned well? This is one of the main questions we are exploring with HeatpumpMonitor.org. There are now 64 systems with a year of data, averaging an SPF H4 of 3.9. Feel free to explore the data for each system on the site 🤓

I've recently updated my blog looking at difference between measured and calculated heat loss in our mid-terrace pre2000 solid stone house trystanlea.org.uk/roombyroomhe... (CIBSE defaults 7.5kW, measured ~3.3 kW)

The energy efficiency of our house combined with the power of an ASHP, solar PV and home battery storage is doing an amazing job so far this year. With 10months gone we have spent £814 on energy (elec + standing charge) and earned £555 in FiTs. So net cost to us = £259 (all in) so for Jan-Oct.

Join me and @alanclarke.bsky.social talking about how to get a heat pump working well in retrofit, why they sometimes don't, and how to avoid adding fuel to Dale Vince's nasty grass-cuttings bonfire passivhaustrust.org.uk/news/detail/...

Loved this episode of BetaTalk by @betatalk.bsky.social , good insights that need to be taken on board by much of formal education, not just heat pump courses, but it would be great to see heat pump training lead the way betatalk.buzzsprout.com/509671/episo...

More interesting data analysis of our ASHP using heatpumpmonitor.org/daily?id=3&m... The transition from combined heating + DHW to just DHW which happens for us ~15C outside temp.

The ability to view Heat Pump energy use as "all", “run”, “space” and “DHW” on EmonCMS / HeatPumpMonitor.org is really helpful. I am showing the DHW and the Space heat view here to highlight the clear differences that are visible.