Open vented system with a boiler and a solid fuel stove as the heat source

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System schematic of an open vented system with a boiler and a solid fuel stove as the heat source. The system has two central heating zones with radiators and a domestic hot water (DHW) cylinder.
There is a heat leak radiator on the gravity fed circuit to ensure that the solid fuel stove can dissipate its heat if no zones are calling.

When the solid fuel stove is firing and zny zone call for heat, the pump between the NRG Zone 5 manifold and the solid fuel stove starts running. This transfers the heat from the stove to the manifold which then can be used in the heating zones.

The non-return valve on the pipework between the manifold and the stove ensures that no heat is drifting from the sealed system to the open system when the stove is not 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 boiler 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.

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