In Ballyfermot Industrial Estate in Dublin stands one of the city’s largest facilities for manufacturing wooden doors and windows. This is a site with substantial heat demand: ceiling-mounted radiant panels in the workshop, radiators in the offices and canteen, and domestic hot water preparation were for years powered by two 350-kW gas boilers that were becoming increasingly inefficient. With required temperatures up to 65 °C, the owners needed a system that could deliver reliable heat even on the coldest days—while keeping noise extremely low due to the neighbouring homes.