OpenEnergyMonitor is a UK-based provider of open-source hardware tools for energy monitoring and visualisation. Its online shop serves people seeking to measure electricity use, monitor heating systems and collect environmental data, with equipment and components for building or expanding monitoring setups. Featured products include the emonPi3 six-channel energy monitor, the emonTx6 wireless monitoring node and the emonTH temperature and humidity sensor. The range also includes heat-pump monitoring bundles, electricity and heat meters, current-transformer and voltage sensors, power supplies, wireless modules and connectivity kits.

For heating and plumbing projects, OpenEnergyMonitor offers flow-measurement valves, temperature probes and plumbing fittings. Its catalogue also features Open Vehicle Monitoring System (OVMS) hardware, including Wi-Fi and 4G options, as well as prototyping components. Customers can purchase Emoncms.org credit alongside physical products. The shop provides product options and online ordering, and publishes information about shipping, returns, warranties and tax. Based in Wales, UK, OpenEnergyMonitor brings together monitoring hardware, supporting components and related services for energy and vehicle data applications.