Grant Vortex 12/16 Internal oil boiler is best fitted for small to medium sized properties with no mains gas supply and where living space is limited making a floor standing boiler impractical. This wall hung boiler features the Vortex stainless steal heat exchanger and tubular baffle system. As a condensing boiler, it is also able to help reduce fuel bills and carbon emissions by reclaiming latent heat from the flue gases. Exceptionally quiet operation. Wall mountable. Unique Grant Vortex stainless steel heat exchanger. Extended to 5 years if installed by a registered G1 . installer with a Grant or equivalent filter. Factory fitted condensate trap. Latest riello burner technology. 1 Year standard warranty and 2 years if registered within 30 days.