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The Grant Vortex Eco WH External Oil System Boiler range are an externally wall hung oil boiler ideal for small to medium size properties in rural areas without a mains gas supply. The Vortex Eco WH External Oil System Boilers feature the patented vortex stainless steel heat exchanger and tubular baffle system. Also the system model feature a factory fitted expansion vessel, filling loop, pressure gauge, automatic air vent, pressure relief valve abd circulating pump. Plus the Vortex Eco WH External Oil System Boilers come with a factory fitted flue and are finished in a robust powder coated painted case and built in frost protection protecting the boiler from the elements.
At Boilers2go we recommend the Grant Vortex Eco 16/21 WH External Oil System Boiler for medium to large size properties in rural areas without a mains gas supply. The Vortex Eco 16/21 WH External Oil Regular Boiler is also a condensing boiler able to help reduce fuel bills and carbon emissions by reclaiming latent heat from the flue gases. Plus the Vortex Eco 16/21 WH External Oil Regular Boiler comes with a 2 year manufacturer's warranty for peace of mind.
In a closed hot water circuit water cannot be compressed so any expansion in volume, created by an increase in temperature, needs to be accommodated by the expansion vessel. When the water is cold the pre-charge pressure forces the membrane sack, within the vessel, to collapse until the pump is started when the sack starts to inflate. As the temperature in the hot water circuit increases, resulting in the expansion of the water within the circuit, the expanded water enters the sack creating additional volume and lowering the pressure in the hot water circuit. As the water temperature drops the pre-charge pressure force the water from the sack back into the hot water circuit.