The Warmflow Agentis External 21-27kW Oil Boiler is a robust outdoor heating solution featuring the latest low NOx burner technology for improved environmental performance. The unit is protected by an IP45 rated weatherproof casing that requires no maintenance and is built to withstand harsh conditions. It includes a pre-wired thermostat and burner for simplified installation. The highly efficient patented heat exchanger ensures that fuel consumption is kept to a minimum while providing ample heat for medium-sized homes.