Our WNS series boilers are an innovative modern design and not based on outdated 1960’s technology. These boilers incorporate a large, fully corrugated furnace, providing excellent expansion flexibility, increased surface area and strength. A large water cooled reversal chamber is incorporated in the three pass wet back design and ensures maximum efficiency. The WNS boiler design incorporates features that reduce the effects of thermal cycling and manufacturing processes to ensure these high quality products stand the test of time. These features apply across the entire range of this product, regardless of size.

The WNS range of boilers are designed and manufactured to BS EN 12953, this is a well recognised boiler manufacturing standard here in new Zealand.  The WNS boilers are also manufactured under an ISO9001 quality management system. In addition, third party inspections, by a Worksafe approved inspection body are also carried out to independently verify quality during and after the manufacturing process.

Our WNS series Steam and Hot Water boilers provide a gross efficiency from 84% for the lowest specification up to an unprecedented 90% gross for boilers fitted with condenser options. A large combustion space with increased surface area provides superior energy transfer from the combustion gas into the water reducing stresses on the rear tube plate. The fire tubes have a scroll rolled into the outer of the tube, enabling steam bubble formation to migrate around the tube to the surface of the water and into the steam space. These scrolled fire tubes also promote combustion gas turbulence within the tube, improving heat transfer and further increasing efficiency.

The superior triple layer insulation system on the WNS series boilers comprises a high density insulation layer attached to the shell of the boiler and covered by a thick silver reflective blanket to reflect lost heat back inward, encompassed by a thick layer of fibre glass insulation and then clad in an outer layer of stainless steel. In addition, both the second and third pass combustion gas reversal chambers are internally lined with refractory and insulation, a unique feature to this boiler range. This insulation provides extensive heat retention in the combustion gases and reduces radiant and conductive losses to atmosphere, achieving optimal flue gas efficiency and exterior boiler surface temperatures typically below 50°C.

Each model of WNS boiler range incorporates a large steam space and steam scrubber, providing high quality steam even under varying loads. This high quality steam eliminates unnecessary condensate in the steam, ensuring superior heat exchange in the process equipment, reducing overall fuel consumption and scaling.