Stainless steel open-vented or unvented indirect triple-coil mains pressure hot water cylinders for combining solid fuel, biomass, gas, electric or oil-fired boilers and solar thermal systems.

Grant DuoWave Plus Cylinders

DuoWave Plus CylinderThe Grant DuoWave Plus is a further development of the DuoWave cylinder range and is available in a 300 litre model only. The cylinder is designed to combine different heating technologies within a single system by utilising up to three separate high performance heating coils and one 3kW immersion heater.

Design specifications
When installed as an open vented cylinder, it is possible to combine a solid fuel or wood burning appliance with an oil or gas boiler. An additional heat source, such as solar thermal can also be linked using the high performance coil, located at the bottom of the cylinder.

The unvented version is similar in design, but incorporates all of the additional controls necessary to use the unit in an unvented system installation. It enables up to three separately controlled heat sources to be linked together. This is particularly useful when combining traditional fossil fuel appliances like oil or gas boilers with renewable technologies like heat pumps, solar thermal or fully controlled wood pellet (biomass) boilers.

*If the DuoWave Plus is to be connected to a non-thermostatically controlled appliance (e.g. Solid fuel back boiler), the cylinder must be installed in an open-vented system to comply with current Building Regulations.  Note: In an open-vented system, the T+P Valve would not operate in pressure mode, but may still operated on temperature, so it should be connected in the correct manner (see installation manual).



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Cylinder and Thermal Store Case Studies

Living with a Grant Vecta biomass boiler

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Townsends take up renewables

Established in 1945, W.J Townsend & Son is a family run business providing domestic customers in Towcester and surrounding areas with a comprehensive range of plumbing and heating services. The business has been in the family for over 75 years with William John Townsend, founding the company. Andy his sonRead More

East Green Energy lead the way with Grant Spira

Renewable energy specialists East Green Energy are leading the way by installing an award wining Grant Spira Wood Pellet Boiler in their showroom at the Company’s Suffolk headquarters. Believed to be the only showroom in East Anglia with a fully working Wood Pellet Boiler, it is certainly generating a greatRead More

Installer promotes advantages of renewable heating

Long established plumbing and heating installers, Great Yarmouth Heating Company Ltd, is promoting the benefits of energy saving, by kitting out their premises with an array of Grant MCS approved renewable technologies. Based on Gapton Hall Industrial Estate, GYH was founded in 1971 and has installed, serviced, and maintained GrantRead More