2 x 150 tornado3 pre plumbed as per HOMegas

Cylinder 1> has 3 zones, one zone for hot water, and two zones for heating, the order code is T2Si150/3.0/SPLAN extra zone valve needs adding to order.

Cylinder 2> 1 zone valve for cylinder hot water coil only,  T2Si150/3.0/SPLAN Hot water coil zone valve only, no heating zone valve required.