System schematic of a system with two oil boilers, solar panels and two optional gas boilers as the heat sources. The outputs are an underfloor heating zone, a radiator zone and a domestic hot water (DHW) cylinder. The DHW cylinder has two coils and can either be heated from the solar panel, or from the boilers.
The NRG Zone 5 manifold ensures that the boilers receives the coldest possible return water so that it is working under optimum conditions and with optimal efficiency. This is especially important for condensing boilers as it greatly increases the likelihood of the boiler operating in condensing mode, which is by far the most efficient. The manifold also ensures that the central heating zones and the DHW cylinder have access to the warmest possible water for their flow.