4.8 Water Connections
The diagram below indicates the plumbing connections at the rear of the boiler. Two flow
connections and two return connections to run separate circuits to the DHW cylinder
and the heating.
It is recommended that the boiler is plumbed into open vented system (the maximum
static head of water permissible is 90 ft. (27.44 meters)), but if it is being connected to a
sealed system an appropriately sized expansion vessel should be used and installed as
per manufacturers instructions. The expansion vessel should be sized based on the
water capacity in the boiler and the water in the entire heating system.
Incorrectly sized expansion vessel will invalidate the warranty
The pump must be always be placed on the return pipe work just before the boiler. It is
recommended that a by-pass pipe between the flow and return is used with a valve to
regulate the temperature of the water returning to the boiler. If only one flow and return
is required then blank off the unused connections and pipe the flow and return from
opposite side of the boiler. An automatic air vent and pressure relief valve must be fitted
to the flow pipe work immediately outside the boiler. The pressure relief valve should be
piped to a drain to prevent injury to the User or Service Technicians if it is activated.
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2” BSP Flow
2” BSP Return
1” Drain
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