To heat water, fuel or oil circulating in pipework at 15 bar max. Consisting of 1, 2 or 4 DN 80 vessels, in painted carbon steel, M77 screw plug immersion heaters and a safety thermostat with automatic reset, set at 115°C for water and adjustable between 0° and 300°C for oil. Horizontal wall mounting by adjustable brackets (non-insulated models). SP*= Scoured and passived