Warmflow Agentis Professiol 21kW Interl Heat Only Boiler White I21PRO.

Warmflow Agentis Professional I21 is a compact, high-efficiency internal heat only oil boiler designed for kitchen and utility room installations. It features Warmflow patented 5mm stainless steel heat exchanger and a low NOx Riello burner for quiet, efficient operation. The I21 sits within the Agentis Internal range offering outputs from 15-44 kW (I21 is the 21 kW model), a slim white casing for seamless integration, AA-rated efficiency and HVO readiness for future fuels. The Professional variant includes factory-fitted components to reduce installation time and cost, making it ideal for homeowners and installers seeking a reliable, space-saving heat-only boiler with low emissions and strong fuel economy.