The system will be delivered in good working condition to your delivery site.
Thence forward, most components are guaranteed for 10 years*. This includes the tubes, manifold, heat tubes and the stainless steel (Everlast) hot water cylinders.
The lower cost (non-stainless steel cylinders) will also give you a long service life, but only of the sacrificial anode is replaced every 6 or 7 years. For this reason, these cylinders carry a lesser 5 year guarantee.
The pump and controller are of high quality and carry the manufacturers guarantee.
* Note that guarantees apply in relation to manufacturing faults — not if the system is maltreated or mishandled or accidentally broken.