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The Unical Ellprex is a range of 3 pass, reverse - flame steel boilers, producing outputs from 170kW to 4000kW.

The tubes for the third pass are fitted with turbulators to maximise heat exchange. For models 170 to 630, the combustion chamber is welded to both the front and rear plates. For models 760 to 4000, the combustion chamber is attached only to the front plate by a double-bevel butt weld (as per EN 303-1). This allows the combustion chamber to freely expand and so minimises metallurgical stress.

To help reduce Standby losses and contribute to high seasonal efficiencies Ellprex boilers have 80 mm of glass wool insulation mattress with mineral fibre backing.

• Seasonal efficiency of over 84% for most models gives compliance with ADL2B 2010 for gas-fired boilers without the need for additional heating credits
• Combustion chamber welding detail minimises thermal stress
• Very low stand-by losses
• Wide range of 2-stage gas and oil, dual-fuel and modulating gas burners available