Cordivari BOLLY 2 ST FB Polywarm Twin Coil Calorifier 300 L

The Cordivari BOLLY 2 ST FB is a domestic hot water calorifier with two fixed heat exchangers. The 300 litre model has a 1.2 m² lower coil and a 0.7 m² upper coil, so the cylinder can be heated by two separate sources, for example a boiler on one coil and a solar thermal or heat pump circuit on the other. All connections are aligned front and back for a neat installation. For a single heat source, see the Polywarm single coil 300 L calorifier.

The tank and both coils are mild steel finished internally with Cordivari’s Polywarm coating, which carries ACS, SSICA, EN 16421 and WRAS attestations for water intended for human consumption, backed by a magnesium anode for cathodic protection and silicone gaskets tested to Directive 98/83/EC. Maximum working pressure is 10 bar on the tank and 12 bar on the coils, with maximum temperatures of 90 °C and 110 °C respectively. The 300 litre tank is 650 mm in diameter, 1,486 mm high and weighs 83 kg, with hard polyurethane foam insulation and an energy efficiency class of B.

Harold Engineering supplies, installs and commissions Cordivari calorifiers and buffer tanks as part of complete heating systems from our Dublin and Galway bases, with 15 OEM trained field service engineers and a 24 hour breakdown callout service. Contact us to size a calorifier for your site.