Secondary circulation helps reduce the delay from turning on your hot tap to actually getting the hot water.
This is often beneficial for larger installations with longer pipe runs. Water sitting in the pipes firstly needs to be drawn off, (and typically wasted!) before the hot water arrives from the cylinder. Furthermore, the replenished hot water in the pipe will again cool down over time. Only to be drawn off again, the next time the tap is used. This is inefficient and encourages water wastage; a volume of water is heated, allowed to cool and then drawn off.
A secondary hot water circuit circulates a loop of hot water around the property, in close proximity to the outlets. Such as the kitchen and bathrooms. Therefore, whenever a tap is turned on, the hot water is almost instantaneous, coming from the nearby loop.
Secondary Circulation circuits can generally be retro-fitted to existing systems, but the amount of work (and cost) involved ultimately depends on the existing system layout and design. Normally, the issue is in gaining access to lay the new pipe work!
Please feel free to contact Apex Plumbing and Heating to discuss you requirements or to arrange an on-site survey.