This schematic shows a system with an oil boiler and two solid fuel stoves as its heat sources. The system delivers heat to four radiator zones and a domestic hot water (DHW) cylinder.
Two solid fuel appliances with independent primary heat leak circuits interlinked with an oil boiler.
The safe operation of each solid fuel appliance is ensured with each having it’s own expansion, cold feed facility & safety valve.
The DHW cylinder has three coils so that it can be heated by either solid fuel appliance or the boiler, depending on what is firing.
The NRG Zone 5 manifold ensures that the boiler 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. The manifold also provides the system with a full bypass, meaning that the boiler can always maintain its optimal flowrate.
At the same time it allows any unused heat from the boilers to have a direct bypass back to the Solid Fuel appliance to minimise condensation in the Solid Fuel appliance. This is beneficial since condensation in the solid fuel appliance can lead to corrosion in the appliance.