Archaeological Engineering: James Twallin on Gas Leaks and Church Heat Pumps

Send us Fan Mail In this episode of BetaTalk, Nathan welcomes back engineer and coder James Twallin to discuss the technical nuances of the UK’s energy transition. While industry debates are often binary, this conversation focuses on objective data regarding gas infrastructure, the physics of high mass heritage buildings, and the importance of real world boiler monitoring for hydronic heat pump success. Key Topics Discussed: The "Invisible" Gas Leak Problem: James reveals his research into the UK’s gas network. He explains how current energy policy and EPC ratings often ignore upstream methane leaks. Using Freedom of Information data, he highlights the prevalence of leaks in ancient cast iron mains featuring 19th century archaeological engineering. Decarbonising Heritage Buildings: A deep dive into a 200 year old stone church project. James explains why steady state modelling fails in these environments and how a physics based approach allowed for a successful, intermittent air to air heat pump installation by leveraging the building’s thermal mass. Optimising Hydronic Transitions: Nathan and James discuss a new monitoring device designed to track existing boiler behaviour. By gathering data on flow temperatures and cycling, engineers can create a more accurate blueprint for future heat pump performance. Technical Correction During the recording, a Bosch study involving 4,000 units was discussed. While mentioned as a heat pump survey in the audio, Nathan would like to clarify that the study actually monitored 4,000 gas boilers. Thanks to the Patrons of the Guild of Master Heat Engineers who help make these podcasts possible Support the show Learn more about heat pump heating by following Nathan on Linkedin , Twitter and BlueSky

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Archaeological Engineering: James Twallin on Gas Leaks and Church Heat Pumps is an episode from BetaTalk - The Renewable Energy and Low Carbon Heating Podcast by Nathan Gambling BetaTeach.

This episode is 64:04 long.

This episode was published on Feb 15, 2026.

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