Nathan dives into the history of heating systems and looks at why chemical inhibitors were introduced to prevent corrosion. He also points out that manufactures are possibly misinterpreting the building regulations e.g. they are getting confused with a requirement within the building regs  and the guidance contained in an approved document. It also takes a look at the Benchmark system and questions if it is fit for purpose. Is it biased towards maintaining growth of the chemical inhibitor companies? The episode also looks at how a 1960s home could be heated from single panel radiators with just a flow of approx. 53°C...  Support the show