Grant DuoWave Cylinders

The DuoWave range of mains pressure hot water cylinders were developed to meet the growing demand for systems that combine a renewable heat source with a standard oil, gas or electric boiler. They are particularly suitable for use with solar hot water systems like Grant Solar Thermal. When correctly installed this arrangement can significantly reduce the dependence on traditional fossil fuels resulting in lower energy bills.

Sizes range from 170 litres to 500 litres, comprising five direct and six indirect models which can meet the needs of even the largest of domestic properties.

Direct and Indirect options
Direct models are designed to be electrically heated but also incorporate a high performance solar coil to allow easy connection to a solar thermal system.

Indirect cylinders have two coils for connection to primary heat sources. The solar heat supply should be connected to the bottom coil which is designed to preheat or heat the surrounding water, depending on the temperature of the incoming supply. The central heating boiler connections should then be made to the top coil. The boiler will only operate if the water in the cylinder has not reached the desired preset temperature and the boiler/cylinder controls are installed and commissioned correctly. Featuring high efficiency corrugated heating coils, the Grant DuoWave range is developed to ensure a maximum transfer of the energy collected by renewable systems.

As a safety feature, indirect cylinders come with a control/high limit thermal cut-out that operates at 90°C.

Grant DuoWave Plus cylinders
The Grant DuoWave Plus is a further development of the DuoWave cylinder range and is available in a 300 litre model only. This 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. The DuoWave Plus cylinder can combine solid fuel (open-vented system only), biomass, gas, electric or oil-fired boilers with solar thermal systems.