BetaTalk - The Renewable Energy and Low Carbon Heating Podcast

Nathan Gambling BetaTeach
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"Nathan is brilliant at making the complicated simple..." Amber Rudd (Secretary of State for Energy and Climate Change 2015-16)BetaTalk is an award winning podcast for Local Authorities, Social Housing Groups, Think Tanks, Government, Journalists, Consultants, Developers, Gas, Oil and Heat Pump engineers and the general public. It is hosted by Nathan Gambling who's family have been involved with heat pump technologies for nearly half a century. "Nathan is one of the UK's clean heat leaders, so I always watch him closely..." Chris Stark (former CEO of the Climate Change Committee and Head of UK Gov. Mission Control)The podcast features guests from the policy world as well as some of the UK's remarkable heating engineers. It discusses challenges and opportunities with decarbonised heating.  

  1. JAN 26

    Data, Comfort, and the "Expert Heat Pump Consumer" with Mick Wall

    Send us a text Primary Expert: Mick Wall (IT Specialist, University of Sheffield & Founder of Energy Stats UK) Host: Nathan Gambling (Beta Talk Podcast and Betateach Newsletter) Core Topics: Heat Loss Accuracy, Weather Compensation vs. Room Influence, Smart Tariffs (Octopus Energy). Executive Summary (TL;DR) Standard MCS heat loss calculations often overestimate ventilation losses in older homes by up to 300%. Expert consumer Mick Wall demonstrates that real-world air changes in a 1930s semi-detached house are closer to 0.5 ACH (Air Changes per Hour) rather than the CIBSE default of 1.5–3.0 ACH. This episode explores how to verify heat loss using Pulse Tests and CO2 Decay to prevent heat pump oversizing. 1. Challenging MCS Heat Loss Defaults Standard industry calculations often rely on static building guides that fail to account for the actual "tightness" of 20th-century builds. The Problem: Default values from CIBSE and MCS result in oversized heat pumps, leading to short-cycling and reduced efficiency.  The Evidence: Mick Wall utilises three distinct methodologies to validate air change rates:  Pressure Testing: Utilising the Build Test Solutions Pulse kit for rapid air evacuation measurement.   CO2 Decay Monitoring: Deploying Purrmetrix sensors to track gas dissipation over 7 days.   Reverse Modeling: Matching 4 years of Open Energy Monitor data against Spruce fabric loss models.  2. Comfort Dynamics: Weather Compensation vs. Room Influence While "pure" weather compensation (adjusting flow temperature based on outdoor air) is better than on/off control, it often lacks the "aggression" needed for rapid recovery. Pure Weather Comp: Best for steady-state efficiency but may fail during sudden internal temperature drops.  Room Influence: Wall advocates for this approach and currently uses his Vaillant control with Havenwise which is an optimiser.  Key Takeaway: Insulation (e.g., bay window upgrades) provides "unmeasurable comfort" by eliminating drafts, even when the fabric watt-saving is minimal.  3. Optimising the "Elephant in the Room": Smart Tariffs A high-quality heat pump installation must perform efficiently regardless of the tariff. However, leveraging the Octopus Energy Kraken platform provides significant cost advantages. Agile vs. Cozy Tariffs: Understanding how to shift loads without sacrificing comfort.  The Risk: Relying on cheap overnight electricity to "mask" a poorly designed, low-efficiency system.  Support the show Learn more about heat pump heating by following Nathan on Linkedin, Twitter and BlueSky

    1h 15m

  2. JAN 12

    Demystifying NESO: Grid Constraints, CCGT Maintenance, and the Kilowatts.io Dashboard

    Send us a text In this episode, Nathan sits down with economist Ben Watts, the creator of the real-time energy dashboard at kilowatts.io. They explore the hidden "engine room" of the UK’s electricity system, the high-stakes market where power is traded in 30-minute blocks.  Ben explains why a single line on the map (the B6 Boundary) is costing consumers over £1 billion a year and how technology like heat pumps and EVs are moving from being "loads" to "assets" that help keep the grid balanced. Key Jargon Buster: The Grid Boundaries To help listeners follow the conversation, here is a quick guide to the "pinch points" Ben mentions: B6 Boundary: The most critical bottleneck in the UK. It runs along the Scottish-English border.B4 Boundary: A northern bottleneck separating the Scottish Highlands from the Central Belt.The "4.5 GW" Limit: The onshore overhead cables at B6 can securely handle about 4.5 GW. When combined with the Western HVDC subsea link (2.2 GW), the total limit is roughly 6.7 GW.Wind Curtailment: When there is more wind in Scotland than the B6 "pipes" can carry, NESO pays wind farms to stop generating while paying gas plants in the South to turn on.Keywords & Themes kilowatts.io: Ben’s dashboard for visualising real-time grid data.NESO: The National Energy System Operator (the new name for the system operator in 2026).CCGT Maintenance: Why demineralised water is essential for the steam turbines in gas power plants.Flexibility Assets: Using heat pumps as "virtual power plants" to respond to grid signals at 50Hz. Support the show Learn more about heat pump heating by following Nathan on Linkedin, Twitter and BlueSky

    1h 17m

  3. 12/19/2025

    The Space Between Marketing and Heating Science in the Heating Sector

    Send us a text In this episode of BetaTalk, I talk about a subject I am deeply passionate about marketing within the UK heating sector. The UK has the most competitive heating market in Europe, with the highest boiler sales across the continent. In such a competitive environment, marketing plays an essential role. I reflect on how, at times, marketing messages can move away from fundamental heating science. This is not about blame or intent, but about acknowledging how commercial pressure and fast-moving narratives can influence communication. As scrutiny of the sector continues to increase from regulators, consumer bodies, and groups examining greenwashing, these gaps are becoming more noticeable. I talk about how this scrutiny is shaping conversations across the industry, including within marketing teams and trade bodies, where there can be tension between commercial expectations and technical accuracy. I also share why I speak about my grandfather so often on this podcast, and how his influence shaped my views on engineering, responsibility, and honesty in how we communicate technical information. This episode is a reflective discussion about marketing, science, and integrity, and how the heating industry can continue to communicate with clarity in an increasingly examined environment. Support the show Learn more about heat pump heating by following Nathan on Linkedin, Twitter and BlueSky

    53 min

  4. 11/26/2025

    A Historical Moment: John Ewbank & the New Frontier of Air-to-Air Heat Pumps

    Send us a text BetaTalk Podcast Show Notes: Air-to-Air Heat Pump Pioneering with John  In this landmark episode of BetaTalk, the host sits down with John Ewbank to discuss his pioneering and invaluable research into the domestic application of Air-to-Air Heat Pumps (A2A HPs). This conversation marks a potentially historical inflection point for the UK heating sector, as Ewbank’s practical, data-driven work pushes the boundaries of efficient home heating.  🔬 The Pioneers of UK Heating The episode highlights a crucial lineage of highly skilled, 'geeky' homeowners and engineers who have collectively advanced the understanding and adoption of low-carbon domestic heating in the UK. Ewbank’s work stands alongside the incredible efforts of figures such as: Mick WallJohn CantorTrystan LeeGlyn HudsonThese individuals have performed & shared ground-breaking real-world research, often filling gaps left by industry.  💡 Collaboration with Nesta A significant element of the discussion is John Ewbank's collaboration with Nesta, the UK's innovation foundation and think tank. The host expresses great satisfaction that Nesta is engaging directly with practitioners and heating engineers like Ewbank. Their approach is highlighted as being uniquely effective among Third Sector entities in actively supporting and utilizing the crucial data generated by this community of independent researchers. This is a vital episode for anyone interested in heat pumps, energy efficiency, and the future of UK home heating. Dive into the conversation, share it widely, and join the discussion around this incredible, pioneering work! https://www.youtube.com/@TimAndKatsGreenWalk Have Toshiba Haori set up -  Does interesting experiments. https://x.com/timothymortimer Daikin Stylish installed very happy https://x.com/jimmybb - Daikin Stylish installed very happy https://www.youtube.com/@EVPuzzle has many videos on his air to air system https://www.youtube.com/@MrEV - other perspective installed has mixed feelings, but thinks was system design. Units were not optimally placed or sized My initial install & experience https://johnewbank.co.uk/what-is-the-cheapest-way-to-heat-your-home/ My experience when I lived with it for a bit. https://johnewbank.co.uk/living-with-an-air-to-air-heat-pump-installation-and-testing-notes/ COP calculations https://johnewbank.co.uk/airtoairmonitoring/ Guild Patrons  PrimaryPro CastRads UK Radiators Renewables Centre Support the show Learn more about heat pump heating by following Nathan on Linkedin, Twitter and BlueSky

    1h 15m

  5. 11/05/2025

    Disrupting Zero Disrupt: Inside EDF's 'Express Heat Pump Initiative'

    Send us a text This week on BetaTalk, we're doing something truly special: the FIRST EVER exclusive interview with EDF Heat Pumps about their groundbreaking new "Express" initiative. EDF's new "Express" initiative is hitting the accelerator, promising faster, smoother heat pump deployments that are directly comparable to the cost of a boiler install.  We sit down with Clay Brown from EDF Heat Pumps behind to unpack: What "Express" really means for installers and homeowners.How they're streamlining the process from survey to switch-on.The vision behind this bold step for #RenewableEnergy.Sign up to the BetaTeach newsletter to view heat pump installations from engineers in the Guild of Master Heat Engineers GUILD PATRONS: Primary Pro Wolseley Renewables Centre Castrads UK Radiators Support the show Learn more about heat pump heating by following Nathan on Linkedin, Twitter and BlueSky

    1h 3m

  6. 11/01/2025

    Government Regulators Crack Down on False Radiator Claims: Why MARC’s Compliance Campaign is a Win for Clean Heat

    Send us a text In this episode Nathan chats to two of the Guild Patrons, Rob Nezard from UK Radiators and Nick Baylis from Castrads about the issue of radiators being sold in the UK with overstated power outputs.  Rob and Nick have been working with the Manufacturers Association of Radiators and Convectors (MARC) and now have the help of the Government body:  Office for Product Safety and Standards (OPSS), the National Regulator for construction products, enforcing the Construction Product Regulations. This level of government involvement is a significant development, and it validates the nearly nine-year campaign for transparency and accurate performance claims across the radiator and convector sector Meet the Guild Patrons Guild Patrons help support the Guild of Master Heat Engineers disseminate quality information about current good practice. Sign up to the Newsletter to see case studies from the Masters Guild Patrons are: Primary Pro Renewable Centre Castrads UK Radiators  Support the show Learn more about heat pump heating by following Nathan on Linkedin, Twitter and BlueSky

    1h 8m

  7. 10/16/2025

    Zero Disrupt Explained: Heat Geek & BetaTalk's Deep Dive with Adam Chapman (New Heat Pump Installation Initiative)

    Send us a text Welcome back to the BetaTalk podcast! I'm thrilled to be joined by Adam Chapman of Heat Geek for a deep dive into the buzz-generating Zero Disrupt initiative. In this episode, Adam shares the full story behind this new heat pump installation program, explaining how it aims to solve critical industry challenges, including improving affordability for consumers and giving homeowners greater choice on system efficiency. If you're keen to understand the strategy and hear what this bold move means for the evolving industry, this is a must-listen episode.  Support the show Learn more about heat pump heating by following Nathan on Linkedin, Twitter and BlueSky

    1h 5m

  8. 10/13/2025

    Heat Pump in a Three-Storey, Timber-Framed Grade II listed building in Buckinghamshire

    Send us a text This episode of Betatalk features a detailed examination of a bespoke heat pump heating system designed by engineers within the Guild of Master Heat Engineers. We speak with Mark Denman of Custom Renewables and Alex Hilton, the homeowner and a wonderful guest who provides valuable insight into sustainability. The engineers are leading heat geeks in the field, and this installation served as an excellent peer-to-peer learning opportunity for the community. We also dedicate time to discussing Zero Disrupt, a new initiative from Heat Geek. This heat pump podcast episode discusses the first case study on the BetaTeach website. Please click the Betateach link to view images and comprehensive details about the installation. BetaTeach.co.uk Support the show Learn more about heat pump heating by following Nathan on Linkedin, Twitter and BlueSky

    51 min
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Ratings & Reviews

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About

"Nathan is brilliant at making the complicated simple..." Amber Rudd (Secretary of State for Energy and Climate Change 2015-16)BetaTalk is an award winning podcast for Local Authorities, Social Housing Groups, Think Tanks, Government, Journalists, Consultants, Developers, Gas, Oil and Heat Pump engineers and the general public. It is hosted by Nathan Gambling who's family have been involved with heat pump technologies for nearly half a century. "Nathan is one of the UK's clean heat leaders, so I always watch him closely..." Chris Stark (former CEO of the Climate Change Committee and Head of UK Gov. Mission Control)The podcast features guests from the policy world as well as some of the UK's remarkable heating engineers. It discusses challenges and opportunities with decarbonised heating.  

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