Unvented hot water Unvented or mains pressure hot water cylinders provide the best hot water service for your home, provided that the incoming main is of sufficient size and working pressure. They give far higher flow rates at greater pressures than combi boilers, recover more quickly than open vented copper cylinders, lose very little energy, and typically come with a 25 year guarantee. They also facilitate a hot water (secondary) return which is very important for larger properties as it eliminates hot water draw off times. Twin coil unvented cylinders are the simplest way of creating hot water using solar energy.
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